A/C vacuum control

1995 GMC S15
155,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
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RICHARDKLOVEN
  • MEMBER
  • 1 POST
Under acceleration cold air diverts to defrost vents.
Jul 2, 2017 at 7:36 AM
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HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
check for a leaking vacuum line or reservoir tank if you have one. you will have to start at engine and work your way back.
Jul 2, 2017 at 8:48 AM
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