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Heater in 1991 doesn't heat up only cold air comes out def or vents

Just put new thermostat in

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  • Cars & Trucks Master
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If you had some heat before you changed the thermostat, you probably still have air trapped in your cooling system, specifically in the heater core. You state you have a 1991 vehicle, but no make or model. Google "bleeding cooling system 1991 (make) (model)" and you should get guidance on specifics for your vehicle.

Posted on Dec 06, 2016

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Posted on Jan 02, 2017

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