When I select the heat position, there isn't any warm air blowing.
SOURCE: Heat lack of
9 times out of 10 on this old of vehicle its the heater core. If your car temp gauge is working and the car is heating up fine and the blower works then it is most likely your heater core. Not sure how hard it is on that car. SOme times it just under the dash takes about 30 mins but some cars you have to pull the dash out. The part alone is cheap. I would try logging onto autozone.com put in your car find the part (heater core) then look at the how to change section of auto zone.
Goodluck.
SOURCE: Heater blows cool air & never heats up.
I changed the thermostat. It works like a charm now!!
SOURCE: air conditioner problem with 2005 chevy 1500 silverado
I have the same problem exactly, if i turn off the ignition and then turn it back on it begins blowing cold air again. I would like to know what the problen is as it sounds like it is not unique to just my vehicle.
SOURCE: Heater blows cool air instead of warm air
check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.
SOURCE: how can i get the vents to blow cool or cold air instead of hot air
Your Heater tap is probably stuck in the on posision. This is in the engine bay. Not sure if yors is vacume, electric or cable operated. Temporary fix bypass the heater alltogether ie: put the hoses that go to the tap reroute to the motor
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