no heat, low temp readout,?? changed stat

1999 GMC SONOMA
130,000 MILES • 4 CYL • 2WD • MANUAL
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JIEMAN
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  • 1 POST
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?
Jan 8, 2011 at 1:10 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 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.
Feb 23, 2011 at 8:19 AM
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