Question about 1991 GMC Sonoma

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GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading

'91 GMC Sonoma SLE 4.3L
My engine temp gauge is not working. Itried replacing the coolant temp sensor to no avail. I'm trying todetermine if The engine is cooling properly or if its only a short inthe gauge itself.
symptoms (These may or may not apply to this)

1) Fan running from start-up
2) HVAC-Heater does not blow heat on heater setting but hot air does come through when vent setting is on hot air.
3) No bearing noise or visible leaking from water pump

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There are 2 coolant sensors one for gauge and one for ecm

Posted on Jul 23, 2009

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I have replace radiator heater core and water pump and the motor blower and I still have no heat

Posted on Jan 11, 2016

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