540 I Blows cold air in the back when the heat is on. - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 01-05-2014, 02:52 PM
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540 I Blows cold air in the back when the heat is on.

It can be blowing hot air up front and cold air in the back between the seats. Any ideas where to start?

Thanks in advance. Joey
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#2 (permalink) Old 01-07-2014, 05:21 PM
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Check your coolant level, and then bleed the coolant system. You may have an air pocket somewhere in the coolant.


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#3 (permalink) Old 01-14-2014, 03:30 PM
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Unless the rear vents between the seats have a temp wheel with red and blue it will only blow cold air when the AC is on. The heat for the back comes from the floor vents. If you don't want cold air through them you simply turn them off.
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#4 (permalink) Old 01-25-2014, 03:38 PM
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Like cjscopp said, middle vent with no dial is for fresh air only, checkout pg2 of the features link below.

BMW_E32_E34_features
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