Having trouble with my heat in my 2002 Buick Lesabre Limited
Can someone please help me, I am having problems with the heater in my 2002 Buick d Lesabre Limited. When I first turn my heat on it warms up fine, then when I get 10 to 15 miles down the road it starts blowing out cold air, I have to turn it all the way up to 90 degrees then it starts blowing hot air again. If I try to adjust the temperature down it will blow cold air again. I replaced the air door actuator and it still does the same thing. Does anyone have any idea what my problem might be. Thanks.