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Q:

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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I HAVE BEEN TOLD IT'S THE SWITCH OR MOTOR RELAY OR RESISTOR. WHERE ARE THEY LOCATED ON THIS VEHICLE
(1) Answer
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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.