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A/C Blowing Hot on Grand Marquis #5321063 01/12/20 07:44 PM
Joined: Dec 2006
Posts: 3,009
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John_K Offline OP
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Found online that folks say you can hold down buttons on AC module for it to go into diagnostic mode. Anybody out there know if this is true?


2009 Mercury Grand Marquis, 8 cyl auto, 95xxx miles, PU/Fram Ultra
2005 Hyundai Sonata, 4 cyl auto, 99xxx miles, Maxlife/OEM Filter
Current oil stash: 459 qts.


Re: A/C Blowing Hot on Grand Marquis [Re: John_K] #5321078 01/12/20 07:55 PM
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JC1 Offline
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Is this the test you are referring to?

https://www.youtube.com/watch?v=wSLjb8xh7Eg

Are the actuator motors stuck in one position? On my 2015 Caravan it does that when you want to start using the AC (after winter is done and it gets hot out).

The one giving me problems is the passenger side which is to the left of the glove box underneath the left part of the foot well carpeting.

What I found besides the obvious solution of new Actuator motors, was to find where the actuators are and if they are accessible, give them a few firm taps (don't go gorilla) with the side of a hammer. Then turn on the AC unit and cycle it between hot and cold and that seems to loosen up a stuck motor. At least on a Dodge Caravan.

Last edited by JC1; 01/12/20 08:02 PM.

2015 Grand Caravan SXT Plus 0w-20 Pennzoil Ultra/Fram Ultra Filter
1997 Honda Civic CX 5w-30 PPPP/Fram Ultra Filter
Re: A/C Blowing Hot on Grand Marquis [Re: John_K] #5321088 01/12/20 08:05 PM
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Chris142 Offline
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Compressor coming on? If so.is the suction line cold?


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Re: A/C Blowing Hot on Grand Marquis [Re: John_K] #5321206 01/12/20 11:35 PM
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Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
05 Envoy: XG9837

Motorcraft 5W-50:
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Re: A/C Blowing Hot on Grand Marquis [Re: John_K] #5321243 01/13/20 05:19 AM
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Originally Posted by John_K
Found online that folks say you can hold down buttons on AC module for it to go into diagnostic mode. Anybody out there know if this is true?

AS shown by others; yes - it's true, there is a self diagnostic test.

If you're only getting hot air, regardless of desired setting, then the BDA (blend door actuator) is bad. Not uncommon on the Panther cars. Not really "hard" to fix, but a long, tedious task. Have to pull the entire dash panel (the whole thing, not just the facia bits on the front) away from the chassis a bit to reach it. I did mine and successfully was able to do it in a few hours with help of a friend. There are many vids on this; watch several and you'll get the idea.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
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