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1990 GMC Safari heating issue, 122,000 miles 4.3 6cyl

Tiny
SAMARIAN05
  • MEMBER
  • 1990 GMC SAFARI
Heat blows through defrost vent, but when I try to switch to optional vents I get nothing like the vents are not hooked up. All the blower speed settings work, and I still receive heat just not through any other vents.
Thursday, March 15th, 2007 AT 4:25 AM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
There is a small black plastic vacuum line that is broken. Pop the hood, the line starts at the plenum on your left, the vacuum line goes across the engine to the drivers side, it will be broken.I like to replace it completely with vacuum line instead of the plastic.
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Friday, March 16th, 2007 AT 8:11 AM

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