1989 BMW 635 vents blow hot on front

1989 BMW 635
149,000 MILES • 6 CYL • 2WD • AUTOMATIC
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FASTSHIVY
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  • 1 POST
My 89 635csi is blowing ice cold air from the rear vents, but the front is blowing warm or ambient temperature air. Any ideas on what could cause this?
Aug 23, 2010 at 11:51 PM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Perhaps a stuck expansion valve in the front system. I recommend starting with checking the Freon amount and pressures, this will give us an idea of what is next.
Aug 24, 2010 at 12:31 AM
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