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1999 Lincoln Navigator Question: heater blows cold air



toldridge, 5.4L V8, Derby, KS, January 01, 2010, 12:46

We turn the heater on and it will blow hot air initially and then it turns cold....as we accelerate it will heat back up. This continues while we drive.

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  • Answer #1

    January 01, 2010, 23:35

    Sounds like an open Thermostat, pretty common. You may even have a Check Engine Light on and code for improper warm up, yes?

    http://repairpal.com/check-engine-light here is an article explaining a bit about the check engine light and the Thermostat code http://repairpal.com/OBD-Code-P0128

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