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1995 Buick Park Avenue driver side heat blows cold

Tiny
PCDJ64
  • MEMBER
  • 1995 BUICK PARK AVENUE
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 141,000 MILES
I have dual zone climate control and when it is on auto the driver side starts to blow cold after the car has started to warm up, I have to turn the heat up to 90 degrees for it to stay hot on both sides.
i can't use auto because at 90 degrees it keeps the fan on high.
if I leave it at 90 on manual and adjust fan speed to comfortable level the heat works fine, equal temp on both sides.

i had the control rebuilt because the digital display failed, the control still functioned but you couldn't see what it was doing.
it is reading the outside temp properly and does not flash for any errors.
all of the zones work when selected and setting fan speed manually does function properly.
the passenger door controls function as they should when they are activated.
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Thursday, February 13th, 2014 AT 4:29 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,200 POSTS
With this system, there are two blend air doors that regulate the temp, one for each side. If one side works and the other doesn't work properly, chances are one of the doors is not working properly. You need to check them.
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Thursday, February 13th, 2014 AT 5:28 AM
Tiny
PCDJ64
  • MEMBER
  • 127 POSTS
Both doors work fine and I get hot heat if I turn temp all the way up, I know these cars have issues with the actuators but they are moving the doors.
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Thursday, February 13th, 2014 AT 5:30 AM

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