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Heater blowing cold air antifreez full 1999 lincoln navigator

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Is there a thermostat for the heater loop the same as for the radiator loop on your car cooling system.

1 some cars have thermostats to keep the water just round the engine when the engine is cold and then they open as the engine gets warm to get the water cooled it seems that the water is not coming to the heating circuit so there maybe a thermostat valve that is stuck in the closed position and needs replacement
2 alterativly the heat control lever mechanism is stuck in the cold position and needs to be freed up or the control valve replaced.
3if the system is electrically controlled with no manual levers for heat control then a fuse may have blown or some other electical problem in the heat control mechanism.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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My 1999 caravan is blowing cold air


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Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
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Typical ford Check on the firewall for all your rubber vacuum hoses where the heater hose goes into the firewall if one is broke as you accelerate the vacuum makes the heater switch open giving you heat

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