Why don't my 2004 Z4 blow hot air?


Asked by Dec 31, 2014 at 03:40 PM about the 2004 BMW Z4 2.5i

Question type: General

Blower works, thermostat is brand new and coolant level is correct.  No air in the system.

What is the problem?

11 Answers


Could be either a clogged heater core or faulty temp door under the dash. Another possibility is a bad climate control head. HTH. -Jim

1 out of 1 people think this is helpful.

Thank you very much Jim. I understand "clogged heater core or faulty temp door", but not sure what the climate control head is or where it's located. I am planning on trying to fix this myself, so any additional help would be great. Thanks again...

1 out of 1 people think this is helpful.

You're welcome. Glad to help. The climate control head will be up under the dash. Basically what it does is positions the temp door and adjusts the fan speeds for you to maintain the temp you select on the dash. HTH. -Jim


One last question, Jim. Are the parts you mention: heater core, temp door and climate control head, accessible without having to remove the dashboard? I really appreciate your help with this. Happy New Year..

1 out of 1 people think this is helpful.

Actually they're not. You'll have to remove the lower "hush" panels at the bottom underside of the dash and possibly the center console. HTH. -Jim


DARN! This could be a major project for a DIY'er, it sounds like.


Unfortunately it is. Happy New Year to you as well. -Jim


You seem quite knowledgeable on this stuff, so I have one more question, if I may. I have noticed a knocking sound from what appears to be the front of the engine. I am not talking about the common valve ticking in BMWs, but a louder noise that occurs primarily on cold starts and at low RPMs. Once the engine is warm it goes away. I realize it will be a challenge to diagnose, without actually listening to the engine, I was thinking perhaps a stretched timing chain clanking against the TB cover or something like that, but since they are made of metal, is that even a plausible explanation?


It is. It could be a worn timing chain tentioner that's at the end of it's travel. This is especially true if you have some mileage on the engine. I'd definitely have it looked at. HTH. -Jim


Thank you! You are good. Do you work on these cars on a daily basis and if so, do you live in the DFW area by any chance?


You're welcome. Thank you for the kind words. Actually I work for NAPA in New Jersey. My Nephew had a '98 528i. That's how I became interested in BMWs. They're nice cars!! -Jim

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