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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
I am not sure what your calling the heating resistor?
Are you having problems with the blower motor working on all speeds?
That is the blower motor resistor. It controls the speed of the blower motor by providing resistance on the ground circuit. Since you replace the resistor and still got the same results. This means the climate control or wiring is at fault. Do you have auto or manual climate control assuming you can or plan to diagnose this?
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Thanks for using Just Answer, Chris
Hello again Chris here,