My 2002 chevy silverado, when I turn engine off the heater keeps blowing heat in the cab of truck and sometimes wont blow hot air at all. I have to discconect negative on battery when parked so i dont drain battery. Thanks.
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Check the coolant level first. Low coolant usually affects the heater first. Check you temp gauge and make sure its getting up to temp. Carefully feel both heater hoses where they go thru the fire wall. They should both be about the same. If one is noticably cooler than the other you have a restricton in the heater core and will need to replace it. On some air condition models there is a vacuum operated shut of valve to the heater when the a/c is in use. Your temp selector could be bad in the das or you could have a vacuum operated "shunt door that is not working.
These are pretty much listed in the corrrect order.
that fuse powers pcm fuel heater and some other things. when the fuse blows the pcm shuts down. causing it to not run. usually its the heater that is bad. it is located at the back driver side by the fuel pump. you can unplug it and see if it starts. if so you will need to replace the heater
i had the same problem with my 2000 chevy truck!! i took both hoses off engine and flushed the heater core with water and air frome air compresser,added new coolent and it works perfect!!!! so try flushing your system............