NO AIR
Tuned
Joined: Jul 2007
Posts: 363
Likes: 4
Yea, this comes up here a lot. LOL, Mike
Intermittent air conditioner head problem
Problem: Air conditioner control unit on dash occasionally just goes out as if there is no power to it. This problem is very common, particularly on the ’03’s from what I have seen.
Typical dealer solution: If you can get the vehicle to repeat the problem in front of the dealer, which is rare unless you happen to drive into the dealer while it is happening, they will recommend replacement of the air conditioner head unit on the dash. This costs around $1000 including labor if you are not under warranty. Since this problem is intermittent and occasional for most of us, and not readily repeatable, some of us have wondered if this solution even fixes the problem
Cause: Unknown, but, for some reason it appears, at least at this point, that this problem is common to those of us who leave our headlights on ‘auto’.
Solution: With the key on (in either run or accessory position), turn the headlights on for a couple of seconds, then off. This usually fixes the problem (Weirdly enough).
Intermittent air conditioner head problem
Problem: Air conditioner control unit on dash occasionally just goes out as if there is no power to it. This problem is very common, particularly on the ’03’s from what I have seen.
Typical dealer solution: If you can get the vehicle to repeat the problem in front of the dealer, which is rare unless you happen to drive into the dealer while it is happening, they will recommend replacement of the air conditioner head unit on the dash. This costs around $1000 including labor if you are not under warranty. Since this problem is intermittent and occasional for most of us, and not readily repeatable, some of us have wondered if this solution even fixes the problem
Cause: Unknown, but, for some reason it appears, at least at this point, that this problem is common to those of us who leave our headlights on ‘auto’.
Solution: With the key on (in either run or accessory position), turn the headlights on for a couple of seconds, then off. This usually fixes the problem (Weirdly enough).
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
See if you can get some kind of 12V power directly to the fan motor just to make sure the motor didn't "smoke". If the fan motor runs you can back track the rest of the AC electrical system to see where you do and don't have power. If you have power to the head unit then the problem is obvious. I'm thinking a relay, which isn't as easy to check, but they do go out for no reason.
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Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
The fan switch in the manual control seems to be pretty reliable. I don't think I've ever heard of anyone having a problem with it. That leaves a fuse or the fan relay. Fuse sockets do get loose and some corrosion can cause them to not pass juice. You can check to make sure the fuse is good, the fuse fits tightly into the socket and there is no corrosion. You can check the fan relay pins for corrosion also and if the problem persists, replace it.
If the fan motor is working now, I'd guess it's not the problem. It seems bearings on them usually fail before they do. But I could be wrong.
Fuses to check are 10 amp #28 and 40 amp #107. The diagram below shows the location of the blower motor relay.
Edit: You might also want to check the wiring harness connector on the fan for corrosion.
If the fan motor is working now, I'd guess it's not the problem. It seems bearings on them usually fail before they do. But I could be wrong.
Fuses to check are 10 amp #28 and 40 amp #107. The diagram below shows the location of the blower motor relay.
Edit: You might also want to check the wiring harness connector on the fan for corrosion.
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Joined: Mar 2008
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Thanks for the tips, will take a look for any corrosion. First thing I did was pull all fuses and check them, I also ensured they were all seated securely and all seemed to be fine. I thought the motor went for sure..then it just suddenly kicked on and has been working fine. But want to get the problem fixed before the windows are frosted and its 30 degrees and I have no heat one morning when I leave for work. Just makes it hard to trouble shoot when everythings working fine.
Hotshot
Joined: Dec 2003
Posts: 15,369
Likes: 121
From: Stuttgart, Ar
I agree with you David. Fan motors are pretty bulletproof electrically.
To the OP: IIRC several of the big relays in the pic that David posted are the same. If the problem reoccurs try switching the Fan relay with the rear window defrost relay and see if that immediately cures the problem. That's something you can do at no cost to yourself, and as David also said check for corrosion on the connections and misinstalled fuses.
To the OP: IIRC several of the big relays in the pic that David posted are the same. If the problem reoccurs try switching the Fan relay with the rear window defrost relay and see if that immediately cures the problem. That's something you can do at no cost to yourself, and as David also said check for corrosion on the connections and misinstalled fuses.
