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Re: heater won't work
Make sure there is enough anti-freeze in the truck and if it be a while flush the system and replace thermastat and check all the fuses for the blower and if they are good and the power going to the blower is but none is coming from the blower replace the blower itself
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I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that
If it is the fan/blower that is not working (as opposed to what is coming out is cold), then the problem could be 1) fuse 2) Blower Resistor. I just replaced the blower resistor in about 15 min with a $25 replacement resistor. The unit is right behind the glove box.
If the problem is that the air coming out is cold and not hot, then the thermostat, radiator, heater core, etc... are the more likley causes.
First I recommend checking that your coolant level is good. Please check this cold so you don't risk getting burned. I have seen too many heater complaints where the coolant level was simply too low to fill the heater core. Next, you should check if the heater control valve is operating. I don't have any GM experience, but heater valves are often the cause of intermittent heater operation in many cars. Good luck!
Geraldine,I would venture that the resistor board,usually mounted near the blower motor,has almost gone all the way bad. Have someone check it. Of course,it could be the blower speed selector switch,but probably not. don-ohio (:^)