I had the same problem before.if you check under your passenger side dash,where your feet go it will be a little box with three long screws.take that off,clean the connectors,make sure none of your wires are loose.thats what i did and never had a problem since.hope this works
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The fan will not quit completely if it is the resister, Did you check if a fuse is Blowin? Or the relay is defective, The blower motor could be shot , They don,t last for ever,. If resister is bad one of the speeds for the fan mostly quits working,
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!
you need to check your wiring to the motor and ascertain if you have a positive and negative feed to your motor to see if your motor is ok, see if you can put a feed directly to the motor to prove it, if the motor runs you have a wiring problem elsewhere