HEATING ISSUE,122,000 MILES 4.3 6CYL

1990 GMC Safari

Tiny

samarian05

March, 15, 2007 AT 4:25 AM

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.

FOUND 1403 RELATED QUESTIONS

1 Answer

Tiny

Jack42

March, 16, 2007 AT 8:11 AM

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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