There is a O-ring kit online for a few dollars to fix that. The unit comes apart and the four solenoids are exposed. Disassemble the solenoids and replace the O-rings. There's small parts in the solenoids ( a spring and a spacer), so be careful. There is a KZread video showing how it's done. I have a 2004 GMarc with the same problem and fixed it myself.. No need to spend $300-700 on a new head.

You're a good mechanic and you're awesome human being you're very fair man God bless you

Thank you for your video. Your diagnosis was spot on with my 2008 Mercury Grand Marquis. I did not purchase a rebuilt EATC unit but instead rebuilt mine for approximately $1.60 in parts and 1.5 hours labor. I saved $1300 which is what the local dealership quoted for the repair. I did not have the vacuum gauge or pump but your description was exactly what I was experiencing with my vehicle so I just took a shot and it worked perfectly.

@jimthecarguy

6 жыл бұрын

Charlie Johnson I am very happy things worked out. I appreciate you watching the video.

Hi Jim, I have one of these cars. Now I have something else to worry about. Great Repair, THANKS FRIEND

Thank you Jim for your very great video on my mercury grand marquis eatc control...I took a chance and just replaced the eatc control unit I did not have a pump to test the vacuum.. everything is working perfect.. thank you for making this video for us....Thank you for learning your trade to care for our cars...your new friend Buddy S.

@jimthecarguy

6 жыл бұрын

Thank you Buddy I'm happy to help.Thank you for watching.

Excellent video! Was able to diagnose the same vent issue on my 91 year old Grandfather's '03 MGM. Thank you!

@jimthecarguy

7 жыл бұрын

WJK great job I'm happy to help

Thank you from a mechanic in Hawaii. Very helpful 👍 no other videos were even close to yours

Thanks so much. I learned a lot. This is a common problem in Crowns and Marquis

@jimthecarguy

6 жыл бұрын

Dennis Eichler Appreciate you watching the video.

Nice repair Jim ! needless to say I had the same problem with my Grand Marquis. They will all go bad, just a matter of time.

I have the exact same car and have the exact same problem EXCEPT my problem comes and goes. It will go off and on and on and off over and over, but fortunately is on more than off. I too don't have the vacuum tester and am an inexperienced mechanic, but I can follow directions. You tube has become my best friend since becoming an 87 year old widow on a tight budget recently. Wish I had you in my town, Mineral Wells Tx.

@yvonnevaughan2520

5 жыл бұрын

Forgot one detail: my door locks are also giving me off and on problems. Could these two problems be related?

Thank you for your help I have a friend with the exact problem you make it simple to troubleshoot thank you Sir God Bless and have a great Day.

Awesome Video to diag the issue. I rebuilt my unit by replacing the O-rings in all 4 Solenoids internal to the EATC Head Unit. Love your Videos

@jimthecarguy

Жыл бұрын

Glad it helped

THANKS SO MUCH FOR THE OUTSTANDING VIDEO!! Matched my symptoms and I was able to fabricate a small rubber hose and cross the vacuum source (black) to the vent (blue) and BINGO they worked fine so per your diagnosis I ordered a replacement control unit. I OWE YOU A SERVICE FEE!!

@jimthecarguy

2 жыл бұрын

I'm happy to help. Great job.

Great video jim awesome job, i have 92 f150 you gave me the confidence to tackle it myself, thank you!

@jimthecarguy

2 жыл бұрын

You can do it!

great video, thank you. I also had no a/c from forward facing vents. I found that there are o-rings in the control unit which are easy to replace, and I did, I got a/c to blow as it should. I started it up, turned on a/c and wow, yes, a/c again. But as soon as I shift into Drive, it goes right back to blowing from defrost vent only. If I shut the car off, then re-start, the a/c starts up as it should, coming from forward vents, and it continues to blow right in Reverse, but as soon as I put it into Drive, I hear something actuate in the dash and it goes right back to defrost vent only. So, with your awesome video I got on the right track, then I found that I fixed one issue but seem to have another.

Great video. I'm thinking that I would begin the troubleshooting at the head unit and then deal with that hard to reach under the hood vacuum valve, in the event that the black tube in the head indicates a vacuum supply problem.

Well Thank you very much .. I got a heater module at a junk yard for 40$ installed it like you said and IT WORKED!! Bless you......

@jimthecarguy

4 жыл бұрын

Nice job.I'm happy to help.

@thefreshboy941

4 жыл бұрын

Jimthecarguy y has h yhv

Thank you for your help I have a 99 Ford Ranger and now I know where to start I brought it to my mechanic they say put some freon in and told me at least I have some air blowing out my defroster and told me got to be in the dash and said good luck to me

Those ford's my Old 2008 runs hot to ,thinking about venting hood with neat little scoop to keep plastic manifold from starting to leak but worry about getting water on the engine?

Thank you for this video. My crown victoria has been blowing ac to the windshield for a year. I luckily bought an old crown victoria for parts. After watching your video, I removed the unit from the parts car, plugged it into my car, and instantly it worked. Saved me the cost of diagnostic work at a dealership (slealership) and the cost of a new unit. Thank you for the information. Let the haters in the comments hate, most can't diagnose !@#$ ANYWAY.

You make it look so easy Jim I’m working on a 2004 E250 Ford extra large super duty my vacuum problem when I put on the AC the vent doors opening very weak I can’t get the heat to come out the floor and I can’t get the defroster to engage it’s only coming out of the dashboard I do hear suction going on any suggestions

Just wanted to say thanks I just replaced mine and it was exactly how you said it was..but I did find a way too rebuild the unit for about 3 dollars...replacing the O rings was fairly easy too...

@jimthecarguy

4 жыл бұрын

Glad it helped

Thanks for the helpful video. I'm currently having the same problem with my 2003 Grand Marquis with only 50k miles. I'm trying to decide if I should tackle this repair on my own. Anyway, what would be the fix if you weren't getting vacuum at the first step under the hood? Thanks, Rob

sometimes i wear long sleeves all summer in the shop for when im doing oil changes because the exhaust parts are so hot. I also invested in a pair of heat sleeves there nomex and where them under my sleeves

Great video Jim. I have two Crown Vics, but one is a CVPI, so it doesn't have this fancy HVAC control unit. Manual all they way, which in the abstract I prefer. My 2006 is an LX though, so it has this same unit. As others have stated I'm off to the salvage yard to get a backup even though mine is working fine at the moment. They are obviously way-cheaper at the yard. Just curious ... you said that you can't do that in a shop. I've heard that before and almost implicitly understand it, but when I think openly about it I'm confused as to why. Is it because you don't have any recourse if the unit goes bad, whereas with the part you bought from the parts store you do? Like some type of built-in warranty or something? Thanks

Thanks for the step by step very well done sir...

@jimthecarguy

4 жыл бұрын

You are welcome

Very underrated mechanic

I need some help. I replaced a hand expansion valve on a 2004 Ford Expedition. I put everything back together and recharged the system and the lines got cold, but my vacuum motors quit working. So I done some research and found that probably the most likely thing that could be wrong is a bad vacuum line. So I checked the vacuum under the hood and it had about 18 1/2 inches of mercury. I made sure I had it hooked up right and it was. Then I went to the manual switch and checked vacuum their and it was good. So then I put vacuum to all three motors and all three of them worked. So I assumed it was a bad switch and I went to the salvage yard and bought one and it done the exact same thing the old one did. So now I am at a loss. Is their anything I am missing?

Great video and love the accent. Thanks, this is exactly what is wrong with my 2010 Merc

I have the same issue with NO air coming out of the vents so I completed this test today. I have vaccumm coming out of the main black line. I left the line in the black line and hooled the other end to the blue line as u did in the video but didn't feel anything coming out of the vents? Any suggestions? Does that mean I have a leak on my blue line.

I have a 2011 Grand Marquis that does the same thing, but Heat from the running motor comes back in the cabin, any suggestions on if a climate controller would fix the problem or could it be something else?

great channel, your a great mechanic and a great guy!where about you located/ always learn from you

Great video now time to troubleshoot my car

great... keep it up man you are really great.

@jimthecarguy

7 жыл бұрын

Thank you .I'm happy to help.

Is this the same actuator vent that switches from a/c cold to the heater vent and vice versa ? Mechanic said the heater core worked and it was a vent door not engaging but didn't want to deal with it. 2002 Mercury Grand Marquis. Thanks for answer if possible .

Very helpful thanks

You can fix the head unit with about a dollars worth of o rings. I have fixed several and it is very easy to do.

@nikkiprophet

6 жыл бұрын

Make a video!

@Ranger4645

6 жыл бұрын

Nikki Prophet there are a few great videos aleeady on yt. $3.00 worth of new silicon O rings and basic tools. Takes maybe a half hour to change the four out and easy assembly. kzread.info/dash/bejne/Z32nptVmfpTTpqg.html

@kas0016

5 жыл бұрын

Facts

@javaman2883

3 жыл бұрын

I'm trying to find the videos of how to repair the manual controls, three knob version, for my MGM.

another great video... thank you so much...

@jimthecarguy

4 жыл бұрын

Glad you enjoyed it

So jimthecarguy after watching this video I have bought an OEM original and one from a salvage yard and after putting both of them on my air and heat still only blows out of the defrost. What else could it be? Blend door switch maybe? Any othe ideas? 2006 Merucry grand marquis

I removed the dash to do the heater core. Now the blend door actuator failed. However, my question is when I did the dash the duct that goes to the back seat did not line up when I put it back together. Is there a diagram or do you have any advice on how to get this back in place properly?

I have a 2000 Grand Marquis and I had the heater core replaced but now I only get air through the vents and I do not get any heat even though the heater core is hot. I also just got a P0442 Code (Engine Light) which says a vacuum leak could cause it. Everything worked great before the heater core job was done. Please help or refer me to something.

Ford tech makuloco has a you tube video on fixing these, including the O-Ring part number. You can buy 100 o-rings for 6 bucks on Amazon. There are 4 O-Rings inside that get weak and don't seal vacuum. You could bill more labor and less overpriced control units by doing this easy fix, and best of all No Dorman parts! And no waiting on parts either. Watch his video, you'll be glad you did!

My 08 only blows out of the dash vents. I can control the temp just fine but can't change it to defrost or floor only comes out the dash vents how do I fix thanks

There are places that will rebuild with new O-Rings. Most likely the problem. Thanks for making these videos.

@jimthecarguy

4 жыл бұрын

You bet

Would this be the same thing with and analog system

Hay I've got a 2004 Mercury Marquis the air was working fine then all of a sudden it started blowout just heat the compressor is pumping cold to the unit the lines are cold but nothing as for as cold air isn't coming out inside the car .Can u give me a little advice on what might be wrong .

You are a decent hard working technician Jim. Thanks for sharing.

@johnkimmel2612

7 жыл бұрын

Do you have any kind of a/c in your "office" at least ?

@Blackford86

5 жыл бұрын

He is a rip-off just screwed this guy he could have fixed it for about 15.00 dirt bag!!!

i done the same on my 07 marque and it works fine until i accelerate or pull a hill and put load on motor under load and it goes back to defrost and when load or i level out on gas peddle it goes back to vents so not sure if its the head unit or a bad diaframe i replaced . great help video's

New to the channel. I have a 03 grand marquis ls and the air goes through everything but the front vents also. Will this be the same process to fix. Also, a/c does not get cold. Had refigerent put in last summer and it only last for a day then went hot again. Let me know how f you can help

@mariezellars7929

5 жыл бұрын

Following

Hi i have 2003 honda accord 4cyl somehow one of the fuse kept blowing off and car transmission doesn't work after may i kno what could go wrong???

Thank you sir for sharing I subscribed to your channel

@jimthecarguy

19 күн бұрын

Thanks for the sub!

very helpful video.. My AC blows thru defrost 90% of the time (sometimes blows thru typical front vents for maybe 2-3 minutes, then back to defrost. Now, about 3 weeks ago on a warm day i ran AC and noticed that my AC Compressor "Clutch" cycles on and off rapidly while AC is on. Wondered if this is the "AC Compressor Clutch Cycle Switch"? Also, Now i turn heat on and I only get cool air blowing thru the defrost and lower drivers side floor vent (maybe just a little cool air comes from the passengers floor vent). (But No Warm air for heat)... My guess is (3) possible problems: #1---Vacuum Leak somewhere (at Vacuum Check Valve; at Vacuum Resevoir, at EATC module inside)....#2---Faulty EATC Module , ----- and for no Heat Problem...#3---- EATC Hard Self-Test Faults code is 024 (description indicates "Blend Door Short"), (manual indicates short circuit).....i guess possible short circuit at one of the (circuits) at either one of the Electrical Connection Switches (White Connecter Switch, Black Connector Switch behind the EATC module.......or the "Electrical Switch/Connecter on the Blend Door itself, located deep inside the Dash behind the Air bag and Glove Compartment. Any suggestions on fixing these 3 issues would be appreciated.

Thanks Jim. I have got a 2005 Grand Marquis the HVAC is making clicking sounds continually. The AC unit will only churn hot, even though it delivers cold every once in awhile. I live in Florida and only once used the Heater and this was the start of my problems. Is it possible for me to fix the door/vent myself, even if I make the door only AC only? Living in Florida is not possible without AC. Thanks John

@jimthecarguy

5 жыл бұрын

It sounds like you have have a bad blend door actuator. Can you pin point were the clicking is coming from?

You can fix the head unit for less than $2 by simply replacing the four o rings

@kennetheady1347

Жыл бұрын

Yes I saw that on another video but I'm not sure it would fix this particular problem on this video. You may be right though😊

My aircon blowing from feet only and the mud can't change it help me please

Thank you for your videos! Question: i have a 2005 Merc Grand Marquis that initially stopped switching the heat/ac from defroster, vent, ot foot. Now it blows heat full time. The blower has been disconnected. The faster. the car travels, the more air moves through and the hotter it gets. Any advice would be SO appreciated! Thank you.

@DavidJones-ib3zy

Жыл бұрын

actuator gone bad like mine , hope you got it done yourself, it's a pain to get to & costly to fix $800 for me in my 2006 CV LX.

2000 Econoline the ac/heat defrost all works.When you turn the speed switch from low,medium and high the high does not blow very hard/fast.It blows out but with no real power or high speed it kinda feels like its on medium.Any idea what that could be,the switch itself maybe?Freon is fine too just doesn't blow out the vents with much speed.Thanks

@coreymartel1090

5 жыл бұрын

Blower motor?

Boss can you send me the control for a c 2008 i have grand marquis

Well done Jim! That was so nice of you to sell the guy the part at cost. Most places would not have done that. $350 cost is insane and 900 for the repair. Would a manual a/c unit work in that car instead of the electronic control? I just think spending that much money on that old of car may not be worth it.

@jimthecarguy

7 жыл бұрын

Thank you .I'm not sure if that car came manual a/c

@lidsman2221

7 жыл бұрын

jimthecarguy No idea what your saying but thanks for the reply.

have a real problem, wasnt getting any heat only cold air. replaced heater core and the accuator door is working seems like warm air is around the box but cold air out the vents, any ideas?

@laurelhenderson6021

5 жыл бұрын

if you can email me benover57@yahoo.com

My marquis has no heat, I checked the power, the blower motor and it wont crank. Can you help me figure out what is wrong with my Climate control console? it says that the outside temp is at 120°, when it really is 7°. it would be appreciated, thanks in advance

@jondoe8721

6 жыл бұрын

Hey Erick, First I would check the fuse however you can Press and hold the OFF and FLOOR at the same time then press AUTO within 2 seconds to run a self test and record any error codes, It has to be above 30 and below 90 outside to run the test or you can get false codes, I would guess you can Google the codes if any.

Where the blue hose go under the dash someeone redid my dash and i see that hanging not connected

Jim I have a 1996 LINCOLN TOWN CAR . I can NOT get the heat to come out of the floor vent ,only the defroster and dash vents What do I need to do ? Thank You Ever so

@jimthecarguy

5 жыл бұрын

Did you check the vacuum hoses? If the hoses are good the there could be a problem with one of the actuators on the heater/ac box. Thank you for watching. Watch for the next free tool giveaway coming soon.

Have 2003 mercury grand marque. I am only getting heat and a/c out of dash vent. How do I fix it

@mariezellars7929

5 жыл бұрын

I have the same issue. I wish he would reply

@nicolej5207

5 жыл бұрын

@@mariezellars7929 Replace the EATC unit like he did. You can try junkyard or eBay. There are also few videos on KZread showing how to replace the one rings in the unit you have to fix the problem.

My P71 seems to be blowing air out of all 3 areas, the defroster, dash vents, and floor. What could cause this?

@shaec9397

4 жыл бұрын

Same here in my grand marquis it blows fine when I’m idle in but when I take off it blows out my defroster

Same issue with my 2001 Grand Marquis. only blows through dash vents and no heat. A clicking sound for a while, prior to heat dropped off. A shop replaced the control head about a year ago and problem returned. Car has about 108,000 miles. The intake has been replaced. Other problems are speedometer inop and gas gauge inop. windshield wipers do not park. I can tolerate those but the no heat from HVAC up here in Detroit, in January 2023

Jim, I love watching your videos, however, with less than a dollar worth of 4 silicone o-rings the problem can be fixed by opening the head unit. I just checked on e-bay, it's $3.20 with free shipping for 100 o-rings, all you need is 4 of them.

@jimthecarguy

6 жыл бұрын

Thank you for watching and you input.

@vivalaresistance1000

2 жыл бұрын

Link?

@UncleSarkis

2 жыл бұрын

@@vivalaresistance1000 kzread.info/dash/bejne/gqia18WHkZm4j9I.html

I’m having the same problem I have a 03 Mercury marauder will do the test and see if I come up with the same thing with the vacuum pump

@jimthecarguy

4 жыл бұрын

Thanks for watching.

My air nor ac is coming on ive changed the blower motor and the blower motor resistor still no luck any suggestions

@lebrodericknorman2871

5 жыл бұрын

Did u fix it? What did u do?

Jimthecarguy...my ac takes a good minutes before the aircomes through the vents can you help

@bryandowling8524

4 жыл бұрын

Idk if you fixed it but check the ac relay

On my 02 grand marquis doesn’t blow no air at all the control has power cause it lights out but don’t do nothing else wat it could be ?

@lentoaguirre8672

5 жыл бұрын

Blower have power

I love these videos. Everyone shows a different way to accomplish the same thing. I thought it was interesting how you tested the vents by using a tube plugged into the main line and the blue line. Mine was registering at 15, but started blowing air when connecting it to the blue line. I tried changing out the o-rings on the EATC unit, but to no avail. I placed the EATC back into it's position with the tube still directly attached to the blue line. I can't change the vents, but at least I have cold air blowing on my face. Could this be hazardous? I'm hoping by next week I'll have the cash to go to a junk yard and find a different EATC unit.

@jimthecarguy

7 жыл бұрын

Thank you for stopping by.

Not sure if you’re still responding to the video. I have a 2002 grand Marquis with the exact issue. Will it cause any other issues if you just let it be? I don’t really care where it blows out as long as it gets cold.

I have a 89 grand marquis and I can't get it to blow hot air. I replaced the thermostat. But it's staying cold like I can take the radiator cap off and the water isn't hot enough to burn me.. I don't run hot and it had a new water pump.. help what's going on ?? I gotta 2 year old I gotta keep warm 😟

In my 79 Lincoln when my air conditioner is on when I step on the accelerator and I'm driving the air hot air comes out and then when it idles normal cold air continues again what could be the problem

@jimthecarguy

5 жыл бұрын

Did you check for vacuum leaks or broken hoses?

@bohemialite6371

5 жыл бұрын

@@jimthecarguy I'm in the process of that but I can't find which one they are so many hoses and I don't hear any leaks something is causing the regulator to close when I step on the gas and then open when I release the gas

LOL everyone's favorite company... Dorman : P

so this is the way the retails goes : Dorman cost: $75, rebox company mark up $150, NAPA retails:$350

did this car get a blower motor and hvac unit at the same time

@jimthecarguy

7 жыл бұрын

No but in less tan a month he did the HVAC unit

Hay I've got a 2004 Mercury Marquis the air conditioning was working fine

You can replace the o rings causing this problem many posts on u tube for this $3 for o rings. That is what they did to that reman you purchased. Took them 20 minutes for $300 bucks.Knowledge is power and pays the mortgage.

The new cost 692.00 new from motorcraft spent it.

How do you fix vent heat door

@JBURNJROLL1

6 жыл бұрын

Have to take the instrument panel (dash) off and replace the blend door actuator. Easy fix, took me about 6 hours total. Part was $50

You working along the highway? Noisy background!

I'm having a similar problem with my 2007 Grand Marquis I'm getting air flow through the defogger and floor but not the dashboard vents what percentage of a chance is it that it's the climate control unit? Please someone help me on a nice thank you very much in advance.

@jimthecarguy

5 жыл бұрын

It is a good possibility but before you replace it do the diagnostics. Thanks for watching.

@southboston7239

5 жыл бұрын

@@jimthecarguy I ended up watching a video and changed the O-rings on the eatc and it works great cost me about $7

@jimthecarguy

5 жыл бұрын

@@southboston7239 Thank you for the update good job

How about when the AC goes away when accelerating and comes out the defroster?

@jimthecarguy

3 жыл бұрын

You should check all the vacuum hoses . They maybe cracked or broken.

That was a large job you had working on that air conditioner system, and the owner will be glad to have everything working, but will have a heart attack when they see what the cost is. I hope that my system don't get like that one on either of my vehicles.

@jimthecarguy

7 жыл бұрын

Yes this car had a lot of problems.The owner just kept putting off the work until it got hot out.Then he just wanted it fixed.

there is a video replacing the o rings in the unit. the o ring fix is a dollar.

Great video. Unearthly price for NOT $321 WORTH OF WORK on efforts of dorman.

I went to the junk yard to get a door blend actuator after putting this door blend actuator did

@Wisesaucy

5 жыл бұрын

John Colon boss man . I am only getting ac I need heat . Should I get door blend from junk yard ?

Get Nomex heat sleeves and you'll be glad you did...saves burning yourself. Also get some TommieCopper knee sleeves so you can run really fast when the customer comes back and says that Dorman part failed HAHA

@jimthecarguy

7 жыл бұрын

Hahaha lucky for me the owner was a friend of the guy that owns the parts store and wanted me to get it from him instead of the dealer.

LOL on a 2008 I think I would have went and gotten a used one I know your roll the dice but let's face it your roll the dice with doorman also

@jimthecarguy

7 жыл бұрын

Hahaha your right about Doorman we will see.

Think of comfort and cool air and a cool disposition. Money ain't everything !!

@jimthecarguy

7 жыл бұрын

Especially on a 90+day with 90+ humidity.

What about one vent blowing more air than another

What is it when when you don’t have vacuum

The issue with mine is that the air goes through any vent only problem is that it also blows through the front defroster as well

@jimthecarguy

4 жыл бұрын

Thanks for watching.

No need to replace the entire climate control unit. This problem can be corrected with 4 silicon o rings and a little dialectric greece for a few dollars. These units were made with poor quality rubber seals, as a matter of fact a replacement unit that you pay 400 for will fail too. All you have to do is open the unit and replace the 4 O rings with silicon o rings and then put some treat them with some dialectric greece. Problem fixed. My O3 grand marquis climate control failed and dealer replaced it for 400 and then the new one failed again. I replaired it myself for almost nothing and it has been working perfectly for years now.

@edgarzuniga8767

6 жыл бұрын

John Pessamato were can i buy them out

@edjohnston1878

5 жыл бұрын

John Pessamato How to repair AC controllers mercury markey 2004

@mambrinox

5 жыл бұрын

Not necessarily. You have to diagnose that it is the O rings, which is quite impossible. So you may end up doing the work for nothing

damn lol I paid mine $12 at the pull a parts ...

I Changed The O-rings On 2009 Grand Marquis Works Fine Just TAKE YOUR TIME Be Patient Put Some Silicon Grease On The O-Rings Before Reinstalling O'reilly Has 007 National Nitrile Rubber O-Ring Part # 007 O.D. 9/32 x I.D. 5/32 x Thickness 1/16 Amazon Part Number: 007 (Type In 007 O-rings) Size: 5/32" ID, 9/32" OD, 1/16" Width (Pack of 10)

You could have fixed that problem for $5.00, all you needed was the internal washers within the head unit, they go bad. I did mine!

The head unit vacuum solenoid o rings are only six bucks