Come along with Eric O. as he does a quick diagnosis and repair of this Mercury Grand Marquis that has a problem with the automatic heat. It seems when the customer goes up hill the heater switches to "defrost" mode. Although a modern car it still uses vacuum to switch modes on the HVAC. Let's see how to determine what is wrong. -Enjoy!
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South Main Auto Repair
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Avoca, NY 14809
Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair
WANT AN "SMA" STICKER OF YOUR OWN!?!
Simply send and E-mail to SMAstickers @outlook.com including: your shipping address and e-mail address in the text, I in turn will send you a paypal invoice for $5 each USA or $6 each international. Let me know how many you want and as soon as the paypal invoice is paid I will ship them out ASAP! Thanks for your support of our channel!!
--Eric & Vanessa O.
Feel like sending some swag to SMA because you love the videos but don't know where to send it?
Just ship it here:
South Main Auto Repair
47 S. Main St
PO Box 471
Avoca, NY 14809
Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair
Thank you!
eXACTLY what I needed. Thanks,
Thanks for taking the time to post this. Very helpful!
Thanks. Mine works fine but good to know what to do just in case.
Awesome job! Very helpful
I have yet to figure mine out. Mine nothing changes, it blows out the face vents continuously, a little out the floor and defroster. No matter what mode I select, it never changes. Driving me crazy!
Good demonstration. Thanks
Great video and a great repairman also. Wish you liver close to me.
I just replace the O-rings myself and saved $1000
I am a new subscriber and I love your show! Keep up the great work!
Great job again like always
My 94 F150 did the same thing the vacuum hose was broken under the hood I just slipped some hose over it works awesome now
Why do they use vacuum for actuation?
It's free real estate
Hey buddy thanks for the solution to fix this on '02 F150 Supercrew. Now maybe there is an easy fix for my temp control issue now, bought brand new OEM blend door actuator and put in a new blend door but I have very limited temp control range such as all the way cold and maybe a few temp degree increases such as 70, 75 and 80 is all the way hot and it should be all the way hot at 90* I tried recalibrating the EATC and didnt seem to do anything and there isnt any codes….
I refurbished my eatc unit myself. Replaced all the o-rings internally and only spent $13 and did it in an hour. DONT GET ROBBED BY A MECHANIC THAT WANTS YOUR MONEY. It wasn’t hard, don’t be afraid.
my air blows out vent and defrost at same time 2005 mercury marquis ls
Didn't read all the comments, but there's gotta be a way to dicker the head unit to fix it's fault! I'd play Frankenstein to try to fix it. You should try it and show it. But the damn thing has quite the core as you said. I hate the fact that parts are designed to fail!
Blend Door Actuator is a friggin nightmare. 35 dollar part that costs 600 to get too. 1000 if you are stupid enough to go to the dealer.
Changed a few of these. Great Video! Installed a few of the round plastic vacuum containers on vehicles that had none. That kept the system working. The check valve and LONG vacuum hose are no substitute for the vacuum canister.
Where can a guy get a vacuum tester like the one in your video?
Now that is one heck of a core price. Definitely want to turn that in unmolested….Thanks for the video.
Another A+
Have a 98 ford with the same problem I decided i could live with it but after watching this just might drop the car off and tell you to call me when its fixed lol
My 2003 grand maquis A/C switches from vent to floor/defrost under acceleration. Then back to vent. I've seen remanufactured control units on ebay for $120. Should I take the risk?
Ohh good…. a DOORMAN……………………………… lol
They use vacuum because they have changed very little since 1953. Do they still operate the windows by vacuum aswell?
The Grand Marquis is a very popular car at the senior center where I go to play bingo on Tuesday afternoons.
If you put in silicone O rings it would be good for the life of the car. Doing it your way means more $$ for you in the long run when the aftermarket one leaks again down the road. The key here is silicone.
ford Maverick used it, vacuum actuated abortion that lived!
good job partner!!! so the control module was fried???? thank you for sharing God Bless.
Vacuum actuator park brake? Is my hearing faulty? Curious now. 👍👍
Poops, there it is….”hey dude, there’s your problem..not your hearing but your eyesight!!” LoL 😂
Man, you my favorite digital mechanic. Ever thought of doing an on site series. I have a Titan that needs a blend door actuator replaced. It is a serious pain…anyways carry on and keep fighting the good fight
You make installation of rubber exhaust hangers easier with a spritz of brake parts cleaner… I wonder if it would rejuvenate the diaphragms in the HAVC Programmer Module? My '89 Reatta uses the vacuum system, too. Same color vinyl hoses, the '88-'89 Programmer is a small box, behind the glove box, between the ECM and BCM. The '90-'91 Reatta is in the dash like this Vic. My '77 Cutlass had a similar vacuum system, as many cars did/still do. I think they are pretty reliable, and simple to service; on some models- the actuators are inaccessible unless the dash is removed. Why don't you like the system? I do admit- nothing beats a lever and cable control… the good 'ol days!
i think its the o rings that fail. thats why they want them back.
Hey Eric great video is that a dorman unit
Ford ran those hvac controllers till 2011 especially Ford police cars and grand marquis
Know your glad you ant have to do a heater core on it!!!!!!!!!!!!!!!!!!!!!!!!!!!!
think'd id let the vac hose hang out the dash and connect a small loop for whatever setting i wanted. or use a series of "fish tank" air valves if you want to get silly 🙂
I love working on Fords! GM and imports make me money… Ford builds the good stuff. Imho
Loved the video, the part price is pricey.
Yeah your a fart smeller , I mean a smart feller
Had the same problem on a 01 Ram Van never did figure it out, wish I saw this video a few years ago
Hey, I got a 2005 Grand Marquis and the heater doesnt work in the car. Whenever you switch from cold to hot, the dial just keep spinning as if it not attached from the inside. AC work great jus no heat, any suggestions ???
They hope u 4 get 2 return it
I have a 04 Lariat and with the air on low sometimes driving down the road the fan goes to high speed. Where would you start?
Great video… subbed. They definitely make it so it's not worth your money to tear the unit open… the core price is gonna drive up the junkyard prices too. Don't get me started on '90s Taurus VAPS or blower motor speed control… enough to say that when I sold the Taurus there was a blower speed switch in the glovebox.
Hey Eric Dorman sells a rebuild Ford heat/ac controller 😂😂😒
See this quite often. New or reman unit is for sure the only way to go on a CUSTOMERS car. Yall think Eric O doesn't know you can definitely remove the solenoid pack and replace the o rings but its not a good move for a shop and Eric O knows this. I've done a few including 2 of my own. 98% of the time o rings get her done. But that 2% where a floor light now flickers 3 times a month and the customer just cant live with it anymore, will make you slam a module in it lol. Get it done the first time.