Unexpectedly simple ac solution
Thread Starter
Burning Brakes
Joined: Feb 1999
Posts: 1,157
Likes: 3
From: Encino CA
Unexpectedly simple ac solution
I had been having problems lately getting the ac to turn on after the car had been sitting a while and I thought it might be ac programmer (see other posts). I was reading my owner's manual and noted that there was a recommendation to remove and replace the fuses for the radio and the courtesy lights to resolve certain ac problems. This did not make much sense to me but I opened the fuse box and found the #1 fuse was labled "ac mdl" which I assume is for the ac module. So yesterday I removed that one (with the ignition off) and waited a minute before plugging it back in. Since then, I have had NO problems with the ac. When hitting "auto" it turns on immediately (no waiting for several minutes) and stays on.
I assume that removing and reinstalling the fuse either (1) reset something or (2) perhaps there was bad contact of the fuse with the connectors. I wonder if it is advisable to remove and reseat all of the fuses occasionally? I am knocking on whatever wood I can find hoping that this apparent solution sticks.
I assume that removing and reinstalling the fuse either (1) reset something or (2) perhaps there was bad contact of the fuse with the connectors. I wonder if it is advisable to remove and reseat all of the fuses occasionally? I am knocking on whatever wood I can find hoping that this apparent solution sticks.
Pro
Joined: Jul 2002
Posts: 725
Likes: 1
From: copperas cove, texas
my 91 will cool for awhile and then the light on the dash starts flashing, I pull the recommended fuses and it works again for a short time and then the whole thing happens over again. I'll try the ac module and see if that helps. Thanks for the information
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Weird but good - MDL fuse I think is for the Blower Module or protects the Blower Voltage Return signal to the Programmer. Programmer is the processor and has a memory function. Pulling the fuse that supplies the memory clears it - and that's usually the Courtesy Clock Fuse, but I don't have a schematic handy. You might also need to clear the CCM which may be why the radio fuse needs to come out. Disconnecting and reconnecting the battery does the same thing without having to figure out what circuit does what.
Nice to hear you fixed it. For those who do this, there's usually a brief delay while the Programmer cycles the Temp Door - after that, things should work as advertised (assuming no other system problems).
Nice to hear you fixed it. For those who do this, there's usually a brief delay while the Programmer cycles the Temp Door - after that, things should work as advertised (assuming no other system problems).
