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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 04-28-2005, 04:04 PM   #1 (permalink)
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I recently had an overheat, because I was parked on a hot summer day w/ AC on.
I know its bad to do this, but I was concerned with the AC, and wanted to see if it started working better over time.


Anyway, I think the waterpump and thermostat are fine.
I never heard/saw the Auxilary Fan work in a long time.
Could a faulty Aux. Fan cause an overheat?
Whats the best way to diagnose the root of the problem. (actual fan/sensors/electrical)


Also, where do I fill-up the R-134a?
I see one plug near the right headlight, and another near the right wiperblade.
Both have black cover caps.
Which one is the "low-pressure" plug?
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Old 04-29-2005, 12:19 PM   #2 (permalink)
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ANYBODY KNOW???
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Old 04-29-2005, 01:18 PM   #3 (permalink)
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See, and like my current problem, I think the thermostat might be your problem...if it is sticking, the car doesn't know its hot, therefore the fan doesn't come on....mine is just the opposite...my aux fan wont shut off and is killing my battery

...that said....running your ac at a standstill on a hot day I think will almost always overheat you...I could be wrong about that...
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Old 04-29-2005, 03:51 PM   #4 (permalink)
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Quote:
Originally posted by RIBEMR26@Apr 29 2005, 02:18 PM
See, and like my current problem, I think the thermostat might be your problem...if it is sticking, the car doesn't know its hot, therefore the fan doesn't come on....mine is just the opposite...my aux fan wont shut off and is killing my battery

...that said....running your ac at a standstill on a hot day I think will almost always overheat you...I could be wrong about that...
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It should not overheat if everything is working properly. If the fan is not working, yes, if you idle for a long time, it will get hotter. If you know for sure the fan is not working, start there.

Could be the fan, could be the sensor. The sensor is located on the passenger's side of the radiator. Not sure how you start checking which one is bad. The auxiliary fan is about $300, so maybe start with the sensor?

BTW: If the thermostat is stuck open, the engine will not warm up. Your temp gauge will will not move very much. If the temp is stuck closed, the engine will overheat fairly quickly. Your temp gauge will read all the way into the red. The temp gauge should read in about the middle, normally.
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Old 04-30-2005, 07:08 PM   #5 (permalink)
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check if your fan is plugd in. and change out the relays. they might have gone bad
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Old 05-01-2005, 10:14 AM   #6 (permalink)
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To RIBEMR26
All BMW
Complaint:
If a relay sticks in the closed position after the ignition is turned off the following complaints could arise:
-The auxiliary fan continues running.
-A/C heater blower motor continues running.
-Fog lights and/or headlights stay on.
-The battery goes dead overnight.
-The rear window defogger stays on.

This is due to the battery voltage still being present when the ignition is turned off. Apart from the auxiliary fan the components need their control switch left on for the situation to occur. The auxiliary fan will automatically continue running in this condition.
Remedy:
Replace the defective relay.
Hope this helps you. RIBEMR26


To vmelikRUS
I answer some a/c question on a other post about a/c problem it might answer some of your question.
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Old 05-03-2005, 10:41 AM   #7 (permalink)
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To RIBEMR26
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Complaint:
If a relay sticks in the closed position after the ignition is turned off the following complaints could arise:
-The auxiliary fan continues running.
-A/C heater blower motor continues running.
-Fog lights and/or headlights stay on.
-The battery goes dead overnight.
-The rear window defogger stays on.

This is due to the battery voltage still being present when the ignition is turned off. Apart from the auxiliary fan the components need their control switch left on for the situation to occur. The auxiliary fan will automatically continue running in this condition.
Remedy:
Replace the defective relay.
Hope this helps you. RIBEMR26
Fernguy-

After much research and an unfortunate trip to the dealer -- you are exactly right...

there are two "switches" or relays for the aux. fan on my car. both control it, but one is particularly if the AC is running (this is how it was explained to me). I had run my AC for the first time this season that same day that I had the problem. BMW was reluctant to change it out because the problem could not be replicated...they said it just stuck because it was the first time I used the AC this year...we'll see.

They also charged me like $70 to read out a code (unrelated) which they said was not a problem and just reset it -- which has since come back on...

All in all, BMW of Newport a million times better than Inskip (for all of you New Englanders)
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