Question about 1978 Pontiac Bonneville
Heater fan shut off tell I run over a bump...then will turn on and ajust it's self going over different bumps..
Could be a faulty blower motor or a connection in the wiring.
When it will not work, check the connection at the motor for power and ground.
Posted on Dec 09, 2012
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Posted on Jan 02, 2017
SOURCE: heater and ac blower
I have an '04 with approx. 79000 miles; the blower is going out on mine too. The motor is probably burned out and you will need to replace it. It's about $90 for the part. Kind of a pain to change; I changed the blower motor on my 97 'prix and I had to lay upside down on the passenger seat and work on it upside down. Other than a little physically uncomforable, not too hard to do.
Posted on Nov 26, 2008
SOURCE: My car heater works fine
this problem is most commonly caused by either a sticky air temp control blend door or a defective blend door electric actuator, this door controls the air temp at the heater/AC oulets.
Posted on Jan 14, 2009
SOURCE: blower motor
I had the same problem and replaced the blower motor . it is located up under the glove box . and I test the old one and it would run fast if i shook it .the bearing or something wears out in them . I got one from a wrecked car for 20 verses 78 new . and it works fine . john
Posted on Jan 25, 2009
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