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Heater always on

2708 Views 9 Replies 5 Participants Last post by  Bugsie
Heat is always on with blower as well as when ac is on. Heat mixes with ac air. Changed heater control valve. Still have same issue. Any ideas on what I could try next?

Only thing I can think of is to bypass heater core with the hoses. I have 95 530i. Thanks for any help.
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Stupid question, but did you adjust the wheel in the middle of the vents on the top of the centre console?
I have used that vent setting and heat is on. It does get hotter when adjusting heat setting with blower. I am replacing connector as it was brittle from heat and age.
Are the heater valves getting any power?

Use a DMM.
Make sure they audibly click closed when the a/c is on.
Hi all.

I'm keeping this post under sight cause my car only turns hot. Sorry for the question but DMM? Meaning what??

Sorry again and best regards
Digital Multimeter.

You could also use a volt meter or a test light.
Basically anytihng to prove that power is coming out of the three pin connector for the heater valves.

Roger, copy that. I'll check it out.

Thanks for the prompt answer and best regards
Hi all.

Replying tom paperplane and possibly a help to cyclingkevin, I checked and I got power on one of the pins.

Any more tips on what to look for after that.

Best regards and thanks for the effort.
Check for resistance across the valve's pins. There should be some rather than 'infinite'. Open circuit means new valve.
Hi all.

Just finished the tip from BMW fatherfigure and the results were from 13 to 26 between the three pins.

Any more ideas for this.

Thank you so much for all the help.

Best regards
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