A/C vacuum control

Tiny
RICHARDKLOVEN
  • MEMBER
  • 1995 GMC S15
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 155,000 MILES
Under acceleration cold air diverts to defrost vents.
Sunday, July 2nd, 2017 AT 7:36 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 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.
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Sunday, July 2nd, 2017 AT 8:48 AM

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