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Old 08-02-2019, 01:28 PM   #1
markm1162
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Air Conditioner shuts off and then come back on

I have a 2001 330xi and from time to time the air conditioner will stop blowing completely then after driving it for a short amount of time it comes back on. I dont know if the blower motor is going bad, its a relay problem or what? I live in South Florida and when it stops working it is miserable! This has been going on for about 3 months now but the issue resolves itself and then comes back.


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Old 08-02-2019, 01:35 PM   #2
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Originally Posted by markm1162 View Post
I have a 2001 330xi and from time to time the air conditioner will stop blowing completely then after driving it for a short amount of time it comes back on. I dont know if the blower motor is going bad, its a relay problem or what? I live in South Florida and when it stops working it is miserable! This has been going on for about 3 months now but the issue resolves itself and then comes back.


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When the blower stops is the climate control still on?
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Old 08-02-2019, 01:38 PM   #3
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Have you replaced your final stage resistor (FSR)? Common failure item that will cause the symptoms you describe. A bad one is also a documented fire hazard.
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Last edited by Spannerhead; 08-02-2019 at 01:51 PM. Reason: Said "relay" instead of "resistor"
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Old 08-02-2019, 01:47 PM   #4
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Have you replaced your final stage relay (FSR)? Common failure item that will cause the symptoms you describe. A bad one is also a documented fire hazard.
+1

It's not an expensive part to replace and the job is an easy DIY albeit an ergonomic challenge. Even more so if you're a big fat dude.
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Old 08-02-2019, 02:51 PM   #5
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FSRs cause fires. And heats your meat.

Replace it.
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Old 08-02-2019, 03:16 PM   #6
markm1162
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Yes, and I've noticed that when I turn on the defroster I'll get a little air then it goes away so I don't think the blower motor is shot. I think it's the relay itself.
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Old 08-02-2019, 10:23 PM   #7
markm1162
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That fixed it! Thanks everybody!
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Old 08-04-2019, 02:24 AM   #8
darkfires102
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That fixed it! Thanks everybody!
Final stage resistor? What brand did you use for the replacement, and was it the redesigned smaller fin version?
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Old 08-06-2019, 11:53 AM   #9
markm1162
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Santech PN:MT1813 and as far as I could tell it was identical to the original BMW part.
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Old 08-07-2019, 07:56 AM   #10
markusmarkus
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Identical doesnt mean its of the same quality.
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Old 08-07-2019, 07:31 PM   #11
markm1162
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217,000 mile vehicle worth about $380 on paper. I don't care about the quality! 20-30,000 more miles is all I need to get out of it. What I met is that it looks exactly the same. And I don't buy genuine BMW parts either way too overpriced!
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