air blows thru all ports real good but air will not change from cold to hot

Asked by Jan 24, 2017 at 08:46 AM about the 2002 Chevrolet Astro Cargo Van

Question type: Maintenance & Repair

2002 astro van

1 Answer

32,545

There is a plastic flap that directs air either across the heater core or the AC evap coil called the "temperature blend door." A common failure is the actuator that moves it.

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