Question about 1999 GMC Jimmy
The heat for the car comes on when the car first warms up, but not at a high heat. After 10-15 minutes of driving, air turns cold and heater no longer works
I know this is a old posting but I had a similar problem with my Jimmy. I unplugged both hoses connected to the heater core and got my air compressor out and flushed it with air, do it both ways (inner/outer) . Just try to put some sort of rag in front of the heater core so the coolant does not get onto you. it fixed my problem by doing this, might work for you.
Posted on Mar 15, 2009
Sounds like you do not have enough water in the system, or you have a faulty thermostat
Posted on Feb 16, 2009
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Posted on Jan 02, 2017
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