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No heat, low temp readout? Changed stat

Tiny
JIEMAN
  • MEMBER
  • 1999 GMC SONOMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 130,000 MILES
99 gmc sonoma 2.2ltr, no heat, not overheating, changed thermostat, old one stuck open, back together still no heat, low temp readout. Possible air in system?
Saturday, January 8th, 2011 AT 9:10 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Make sure there are no air pockets. Next, make sure both heater core hoses get hot when the engine is running and the heater is on. If both are hot, have the blend door. If only one gets hot, flush the heater core.
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Wednesday, February 23rd, 2011 AT 4:19 PM

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