HEATER BLOWER NOT WORKING ON 1,2,3, SETTINGS, ONLY 4&5. on 2003 GMC Envoy

I HAVE BEEN TOLD IT'S THE SWITCH OR MOTOR RELAY OR RESISTOR. WHERE ARE THEY LOCATED ON THIS VEHICLE

by in Roscommon, MI on January 02, 2011
1 answer 1 comment
ANSWER by on January 02, 2011
There is a blower motor speed module which is located under the dash not far from the blower motor itself, just follow the wires from the motor. The switch is in the climate control head. Fastest way to tell what is defective is to scan the climate control computer and see if the switch is working, the data stream will display the switch, there may also be some codes in the climate control module for what is ailing your heater system. Most parts stores don't carry a climate control capable scanner, by the way.
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COMMENT by on January 03, 2011
THANK YOU VERY MUCH!