2006 Cadillac Dts Related Heating Vehicle Will Heat Idling Blows Warm

2006 CADILLAC DEVILLE DTS
88,000 MILES
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ANONYMOUS
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My question is related to heating. The vehicle will not heat up when idling, but blows warm/hot air air when it is being driven. It appears normal after this, and the temp gauge indicates the appropriate temp. range. On occassion, the gauge did rise higher, but then returned to normal. I added coolant to the reservoir, but problem continues. I was thinking it may be the thermostat. Any assistance appreciated.
Oct 20, 2012 at 1:17 PM
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MHPAUTOS
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May well be a faulty thermostat, it may be stuck open or collapsed in the open position, i would be checking this first.
Oct 20, 2012 at 1:19 PM
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WRENCHTECH
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It could also be low on coolant causing an air pocket or a restricted heater core.
Oct 20, 2012 at 1:20 PM
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