what does a Blower Moter Resister do

Asked by Feb 08, 2017 at 11:45 AM about the 1995 Chevrolet C/K 1500 Silverado LB 4WD

Question type: Maintenance & Repair

my 95 chevy truck K1500 5.7  heater puts out just warm almost cool air from
the heater . I can run water through the core  pretty well . So its not pluged
up. what could  i do to make it throw hot air . I,ve also changed the

2 Answers


Purge the cooling system of air pockets. The blower motor resistor controls the different speeds of the blower motor. If the resistor goes out, the blower motor does not work.


You can have what appears to be good flow through a heater core, but still no heat, because the blockage can be progressive, meaning water can flow in and through to the outlet easily in the first few rows, yet most of the core is blocked off so little heat exchange takes place. But assuming you have a good core, you have to check that the coolant flow from engine is good, that water pump isn't getting weak, and also check that the blend door is working. You should hear the little plastic flap moving when you cycle between hot and AC.

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