1992 gmc vandura vent wont switch from ac to heat

1992 GMC C2500
150,000 MILES
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PHESTBECH
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  • 1 POST
need to know how to access vent to manually switch from ac to heat
Oct 31, 2011 at 12:52 AM
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HMAC300
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  • 48,601 POSTS
you have vacuum motors to switch these, check for avacuum leak most are under the dash i'm sending a vacuum diagram as that is all we have.
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Oct 31, 2011 at 6:47 PM