1992 cutlass supreme heat problems

Asked by Brian Dec 17, 2015 at 12:55 AM about the 1992 Oldsmobile Cutlass Supreme 2 Dr STD Convertible

Question type: Maintenance & Repair

I have a 1992 Oldsmobile Cutlass
Supreme 3.1 L The vacuum lines
have been repaired. Blower works
great. Heater core has been
flushed. New thermostat. Still it
blows cold air.

18,695

munron answered 8 years ago

Can't remember what it's called, but there's a vacuum operated valve under the dash that opens and closes a gate in the ductwork that closes off the hot air when its not required. It's quite possible that diverter valve has failed and isn't opening when it should.

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