Question about 1997 Lincoln Town Car

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My heater will not switch to ac or go up nor down it stays at a hot constant temperature

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Check fuses an relays also there is a outside temperature sensor you might wanna check as well as the the compressor sensor an clutch . If it happened fast no warning I think a sensor or a control is bad.If not then it might need a coolant charge.

Posted on Oct 12, 2010


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There are a number of things that cause this lack of hot air problem. Let me ask some diagnostic questions. Is the engine reaching normal operating temperature? If not replace the engine thermostat. Are the two hoses going to the heater core under the hood at the firewall hot after driving for a few miles? if not the heater core is plugged, remove the hoses carefully and flush it with a garden hose in both directions. Does the AC blow cold but there seems to be no change in the air temperature when you set it to hot air at the dash register vents? If the thermostat is ok, the heater core is not plugged then you likely have a defective air temperature control "blend" door problem, this door moves back and forth between the heater core for hot air and the AC evaporator core for cold air or blends the two airstreams for the desireed air temperature, it is operated by a small electric motor called a stepper motor (stepper refers to a motor that can maintain a constant position) or the blend door is stuck or hard for the stepper motor to move, both problems are common and both parts must be replaced. To replace the blend door and blend door actuator motor requires that the dash be removed from the car and the heater.AC duct work be opened up. On a scale of 1-10 for 10 being the most difficult this is likely a 8 or 9. The job takes about 10 hours in a shop and about 14 at home.

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I have a 2005 Grand Cherokee Larado with manual temperature control of the heater output temperature. Regardless of the position of the heater temperature control, the heater discharge air temperature is...

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2000 silverado w/100,000mls. Heater will not get hot. AC works perfectly.

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