I have a 86 Monte Carlo and my heater only blows on 2 and 3 on the switch on all settings. What could be my problem? Have done replaced switch in the dash and blower motor resistor still does the same thing any suggestions would be appreciated thanks.

 

Was the switch and the resistor... New? or Used?

If you got them used... You may have gotten another set of faulty ones...??

Or quite possibly, Its the blower motor itself!

 

Nope they was both brand new

 

If the blower isn't operating in high position there is an open in the circuit. Pull the connector from the blower motor and probe the power wire (purple) with a voltage meter or continuity tester. With key on and switch in high position you should see approx. 12v at the connector. If not, check for ground continuity on the black wire in the connector. If both wires check out good but the blower doesn't operate then the blower relay is defective.

 

Mike:
is the blower relay separate from the blower motor? Or is it built into the blower motor?

 

check to see if the harness going to the resistor isn't burnt or singed...i had one that did the same thing that was caused by the connector going to the resistor melting and burned the heck out of the harness