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Tiny
MAXPAUL123
  • MEMBER
  • 1999 OLDSMOBILE SILHOUETTE
  • 6 CYL
  • FWD
  • AUTOMATIC
I have a 1999 oldsmoblie silhouette the front heater will not switch from cold to heat and it will not switch from defrost to front pannel it coming out from all the vents I change the control pannel still no change what controls both that might be bad
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Friday, December 10th, 2010 AT 5:30 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That's pretty odd and probably a coincidence. The mode controls are vacuum controls and the temperature is an electric actuator. The control head is what operates both of them but I suspect you have 2 separate problems. You need to verify vacuum supply from the engine to the control head and make sure the vacuum reading matches engine manifold vacuum.
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Friday, December 10th, 2010 AT 6:06 PM

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