2000 GMC Safari

Tiny
DREW19_2008
  • MEMBER
  • 2000 GMC SAFARI
  • 6 CYL
  • AWD
  • AUTOMATIC
Rear heat blows out cold air? Any suggestions? Front heat works fine 2000 gmc safari
Monday, December 20th, 2010 AT 5:14 AM

1 Reply

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Heater Control Valve just behind the AC accumulator on the passenger side under the hood. Connected to the Heater Control Valve is a Heater Control Valve Solenoid. It just clips on the wall above the control valve. This solenoid has an electrical connection so that when the rear heater switch is turned on and off it switches on and off the solenoid which in turn switches on and off a vaccuum also connected from the solenoid to the valve. This allows or blocks hot coolant from reaching rear heater core.
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Saturday, December 25th, 2010 AT 6:32 AM

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