Question about 2003 Chevrolet S-10
This is not a fault with your controller. Double check your temperature control and make sure it is set to max heat. When you select Defrost for some unknown reason most of the dealers have decided to make this a triggering event to activate the AC unit. The only way to stop this is to disconnect the AC unit wiring harness. You can usually get the same defrost routing of air by selecting the position just before defrost which will not activate the AC unit. as far as getting heat out of the vent without doing this you need to check the main heater core line from the radiator or engine block. This is a 1 inch hose that has a little controller , usually vacuum controlled, to open and close the flow of heated water from your Engine or Radiator. You can check this controller to make sure it is opening and closing correctly.
Posted on Oct 09, 2010
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Posted on Jan 02, 2017
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