Q: My heater only blows on 1 thru 4 changed

asked by on December 15, 2016

2000 Gmc 1500 series truck 4 wheel drive 4.3L My heater control only blows on 1 thru 4. Changed heater swith and the rester and it still does work!Wirin is good Was wondin what else it could be! Thank

My car has 24000 miles.
My car has an automatic transmission.

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