1990 GMC 1500

Tiny
JOSHL
  • MEMBER
  • 1990 GMC C1500
  • V8
  • 4WD
  • AUTOMATIC
My truck stopped blowing hot air what could be my problem
Friday, January 14th, 2011 AT 3:40 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Normally one would expect a thermostat, but with engine at temp, quickly touch the heater core hoses. If one is hot and one cold then heater core is blocked. If both are cold then thermostat.
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Friday, January 14th, 2011 AT 3:45 PM

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