Heather

1998 BUICK PARK AVENUE
105,000 MILES • 6 CYL • FWD • AUTOMATIC
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ARTURO
  • MEMBER
  • 2 POSTS
Why the heather blow hot and cold air trhu the driver vents alternating every 15-20 secs. While trhu the passenger side vents blow cold air only. This happen with temp. adjusted at 60*, if temp. is adjusted at 85* blow cold air only trhu all vents?. Ironically temps adjusted the opposite make it work wrongly any way.
a) No repairs done recently.
b) When coolant or engine temp. rise to 205-210*, a little leaking appear on top of the coolant reservoir.
Dec 29, 2010 at 1:13 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
You need to have the blend doors checked. If you have dual climate control, there are two. They are near the heater core and a pain to get to. Their purpose is to open and close to determine how much heat enters the vehicle.

Let me know if you have other questions.
Joe
Dec 29, 2010 at 2:03 PM
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