1998 GMC Envoy Can't get heat to work

1998 GMC ENVOY
120 MILES • 6 CYL • 4WD • AUTOMATIC
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DAAP
  • MEMBER
  • 1 POST
few months ago had the fan clutch replaced and now it's blowing cold air again replaced the thermostat and still have cold air blowing. what else could be the problem?
Oct 18, 2008 at 8:17 AM
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MMPRINCE4000
  • ✓Experienced Mechanic
  • 8,548 POSTS
You could have a clogged heater core. Have the cooling system flushed, including the heater core.
Oct 21, 2008 at 12:11 AM
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