Heater blows some times

10

Asked by Jan 07, 2017 at 01:08 PM about the 1992 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

my heater come on when it wonts too, I put in a new thermostat but it still blows warm air when it is blowing.

3 Answers

7,675

Check to make sure coolant is circulating through the heater core, thse older model cars have a vacuum operated valve on the heater hoses that needs to open to allow coolant to flow through the heater core, find it and see if it's working

1 of 1 people found this helpful.
10

this 92 Cad Deville has no valve on the hose, it have a T tube which is new and new thermostat

1 of 1 people found this helpful.
71,675

It may be the programmer (under the dash) or one of the temperature sensors. You'll need a factory shop manual to properly diagnose this system. Sounds like it's not fully going to heat mode. HTH. -Jim

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