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Old 05-21-2011, 04:06 AM   #1
volvodefector79

Name: volvodefector79
Title: United Newb
Status: Offline
Join Date: Nov 2007
Location: the Windy City
Rate My Car: 303 / 340
Your Ride: 1995 525i
AC switch not working, BUT recirc does... Ideas???

Hello, all!

OK - here's the deal with my '95 525i...

Summer has arrived here in the greater Chicagoland area, and that means it's time for A/C.

I tried it a few weeks ago, and both the vent AC button/option ("snowflake") and Recirculate options worked just fine. Blew cold air almost instantaneously...

NOW, after trying it today, only the recirculate button works (it engages the compressor and blows cold air)...

The vent AC button (i.e. "snowflake") does NOTHING - it does not illuminate it's tantalizing green LED, nor does it activate the AC compressor.

Any ideas? Are these switches prone to failure? I ask because the other two options on the switch work (defrost and recirculate, especially since recirculate kicks on the AC)...

OR, and this is crazy... could it be related to my outside/external temperature sensor? I could swear the sensor was working fine earlier today (reading the correct temp), but then I read a post elsewhere suggesting that if that sensor is fouled (or missing), it will not engage max AC... THEN I remembered that I just had the car detailed two days ago (my line of thinking was that some polishing compound may have made its way onto the sensor).

Naturally I went out to examine my sensor (about 20 minutes ago) - it WAS connected, but some of the paint was chipped off the tip. All I did was clean/degrease it with some windex... now my onboard computer is telling me it's -33 outside (which it is not).

Here's the weird part... recirculate button STILL works and activates AC/engages compressor.

WTF ???

Does this make sense to any of you? Perhaps people who have had similar issues with their e34 or BMW techs... please weigh in.

I know that I could just settle for recirculated AC ("MAX" AC), but that's not really supposed to be a good thing to do for extended periods of time. And hell - I own a BMW, so I like everything working the way it should be!

Thanks!
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Old 05-22-2011, 11:01 AM   #2
volvodefector79

Name: volvodefector79
Title: United Newb
Status: Offline
Join Date: Nov 2007
Location: the Windy City
Rate My Car: 303 / 340
Your Ride: 1995 525i
something... anything!

Anybody???
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Old 05-22-2011, 11:02 AM   #3
volvodefector79

Name: volvodefector79
Title: United Newb
Status: Offline
Join Date: Nov 2007
Location: the Windy City
Rate My Car: 303 / 340
Your Ride: 1995 525i
ps I've ordered outside/external temp sensor as well as AC switch... as soon as I receive and install them, I'll post results. But other ideas/theories are more than welcome!
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Old 06-03-2011, 12:52 AM   #4
volvodefector79

Name: volvodefector79
Title: United Newb
Status: Offline
Join Date: Nov 2007
Location: the Windy City
Rate My Car: 303 / 340
Your Ride: 1995 525i
No luck with AC switch. And I knew that the external temp sensor would do nothing, SO... Anybody? Anything?
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Old 06-08-2011, 04:09 PM   #5
volvodefector79

Name: volvodefector79
Title: United Newb
Status: Offline
Join Date: Nov 2007
Location: the Windy City
Rate My Car: 303 / 340
Your Ride: 1995 525i
Great... thanks for the help, everybody! (sarcasm) Well, just to keep all 3 people posted, I narrowed the problem down to the IHKR (version III in my auto). Upon removing and disassembling it, there was quite a bit of nasty corrosion on 4 chips and over a number of circuits.

I tried to clean that, but it looked like the damage was too severe. Plugged it back in and, as I suspected, it didn't work. SO I've ordered a used/working unit to swap and hopefully that does the trick.

I'll post results... should anybody wish to read them (or respond).
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