1992 GMC Vandura vent wont switch from AC to heat

Tiny
PHESTBECH
  • MEMBER
  • 1992 GMC C2500
  • 150,000 MILES
Need to know how to access vent to manually switch from ac to heat
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Monday, October 31st, 2011 AT 12:52 AM

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Tiny
HMAC300
  • EXPERT
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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Monday, October 31st, 2011 AT 6:47 PM

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