Question about 2001 GMC Jimmy
Your heater core is pluged
Posted on Jan 29, 2009
Take heater hoses off and flush heater core these vehicles are known for this problem might have to do this every year
Posted on Nov 01, 2008
Flush the radiator/heater core. I had the same problem, flushed it two weeks ago, and now i have heat like ive had in all my previous vehicles. Couldn't believe it took me a year to narrow down what i hadnt done, did it, and i cant stop the hot air now its awesome on cool mornings of late
Posted on Oct 05, 2008
Les, it sounds like your blend door actuator has failed, it is a small vacuum operated diaphram up under the dash that controls a flapper that switches between the cool air and heated air. Good news is that it is an inexpensive part, bad news is pulling the dash out to get to it.
Posted on Oct 02, 2008
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Posted on Jan 02, 2017
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