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Old 10-23-2008, 07:09 AM   #1
Jabboure36
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Heat problem...blows warm then switches to cold??

00 328I...when i first turn the car on i expect it to be a little cold. when i hit normal operating temperature the continues to blow warm air but then it will blast on its own and blow cold air. then calms down and blows warm air again. BUT when i am driving for more than 20-25 min the heat starts cooling and stays cool unless i set it to 91 degrees and then if im lucky it will blow hot air. Why is this? Is it common? What part do I need. Or does it need a reset of some sort
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Old 10-23-2008, 08:35 AM   #2
BMW2k323i
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Hello,

On long driving trips (30mins+), I noticed the same thing. I would leave the temperature to 21.5oC (approx 71oF) and the car will heat up properly. Then after driving for a while 25-30mins+, only cold air comes out. If I hit the defrost button, hot air shoots out. Even if the center duct knob is set to hot air only, cold air still comes out. I have not tried to diagnose the problem yet but I do know this happened last winter as well.

Anyone have a solution?

MC
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Old 10-23-2008, 09:12 AM   #3
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well on bimmerforums they tld me it is most likely the final stage resistor....but how much is something like this? and they had also said that its a diy but kind of complex...
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Old 10-23-2008, 10:56 AM   #4
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Mine does this too! It will be irregular bursts of hot air. I've read on the FSR and most people say it is only this if you cannot control the speed of the fan at all, so I don't know if that applies here, or not....
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Old 10-23-2008, 03:08 PM   #5
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well on bimmerforums they tld me it is most likely the final stage resistor....but how much is something like this? and they had also said that its a diy but kind of complex...
I have already changed the FSR. It's actually not that difficult. You just gotta bend your body in weird positions to reach the part under the dash. All in all, I think it was less than 30 minutes to do. This was one of the first repairs I did on my car so I went slow. This only solved the blower motor speed problem.

MC
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Old 10-23-2008, 05:13 PM   #6
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yea plus....im am tlaking when its on auto it blasts periodically...but it blasts cool air not the heat....? sometimes i freeze in the winter
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Old 10-23-2008, 11:06 PM   #7
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Ok, this might obvious but did you turn the wheel in the middle of the front center vents all the way to hot (red)?
I ALWAYS forget this when the seasons change.
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Old 10-23-2008, 11:21 PM   #8
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The climate control in your car uses a temperature sensor to measure the temperature inside the car, if it senses that it is hotter than what you have the heater set to it will blow cold air to cool it back down.
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Old 10-23-2008, 11:33 PM   #9
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Here is the link for changing FSU: http://forum.e46fanatics.com/showthr...stage+resistor
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Old 10-24-2008, 09:58 AM   #10
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The climate control in your car uses a temperature sensor to measure the temperature inside the car, if it senses that it is hotter than what you have the heater set to it will blow cold air to cool it back down.
How would you know if you have a faulty one of those? Seems like there are WAY too many things that could go wrong with the heat.
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Old 10-24-2008, 11:36 AM   #11
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mine did it... i changed the final stage resistor... all is well now. Im not saying that IS for sure your problem... but in my case it was.
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Old 10-24-2008, 12:00 PM   #12
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I ordered my final stage resistor from Tischer earlier this week, it was like 60 or 70 bucks, don't remember exactly how much since i ordered a few other things with it.
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Old 10-24-2008, 12:52 PM   #13
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I ordered my final stage resistor from Tischer earlier this week, it was like 60 or 70 bucks, don't remember exactly how much since i ordered a few other things with it.
64116923204 $80.35 @ www.getbmwparts.com

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Old 10-24-2008, 01:08 PM   #14
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64116923204 $80.35 @ www.getbmwparts.com

OK, so I was a little off, but the wifey just called and said UPS just dropped it off. Final stage resistor and coolant reservoir. Tischer FTW!
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Old 10-24-2008, 01:12 PM   #15
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OK, so I was a little off, but the wifey just called and said UPS just dropped it off. Final stage resistor and coolant reservoir. Tischer FTW!
Thanks for your support!

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Old 10-24-2008, 01:54 PM   #16
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I thought I noticed this problem in my car during my last trip. Subscribed for a possible future DIY project. Thanks.
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Old 10-24-2008, 08:46 PM   #17
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haha its def on red....i did make that mistake before...but yea so is it the fsr orno?
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Old 10-30-2008, 08:58 PM   #18
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and btw than ks for the link...i want to make sure this is my problem before i purchase it..if it is though this is where im going!
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Old 10-30-2008, 09:10 PM   #19
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btw my dumba$$ forgot to mention that my coolight comes on and off everyday...within the same 3-4 minutes quite often as well
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Old 10-30-2008, 11:47 PM   #20
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Once the internal thermometer hits the displayed number, it blows neutral air from the system to prevent over heating inside. I changed my FSR recently and this "problem" still exists. I bet if it didn't do that, we would have a "my car gets too hot" thread.
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