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E34 (1989 - 1995)

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  #1  
Old 08-15-2012, 05:45 PM
cyclingkevin cyclingkevin is offline
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Location: irvine
 
Join Date: Aug 2011
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Mein Auto: 530i
Heater always on

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.

Last edited by cyclingkevin; 08-15-2012 at 05:51 PM.
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  #2  
Old 08-15-2012, 07:09 PM
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Costa Costa is offline
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Mein Auto: Supercharged E34 540i6
Stupid question, but did you adjust the wheel in the middle of the vents on the top of the centre console?
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  #3  
Old 08-16-2012, 07:59 AM
cyclingkevin cyclingkevin is offline
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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.
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  #4  
Old 08-21-2012, 08:38 PM
paperplane94 paperplane94 is offline
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Mein Auto: 1989 525i M20B25
Are the heater valves getting any power?

Use a DMM.
Make sure they audibly click closed when the a/c is on.
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  #5  
Old 08-22-2012, 02:04 PM
Bugsie Bugsie is offline
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Mein Auto: BMW E34 M50 2.5
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
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  #6  
Old 08-22-2012, 02:23 PM
paperplane94 paperplane94 is offline
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Mein Auto: 1989 525i M20B25
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.
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  #7  
Old 08-22-2012, 03:10 PM
Bugsie Bugsie is offline
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Hi.

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

Thanks for the prompt answer and best regards
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  #8  
Old 09-03-2012, 11:42 AM
Bugsie Bugsie is offline
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Mein Auto: BMW E34 M50 2.5
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.
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  #9  
Old 09-05-2012, 02:59 AM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
Check for resistance across the valve's pins. There should be some rather than 'infinite'. Open circuit means new valve.
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  #10  
Old 09-10-2012, 03:01 PM
Bugsie Bugsie is offline
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Mein Auto: BMW E34 M50 2.5
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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