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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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...


Sounds like its the mixing door actuator motor. I believe its located behind your glove box, so if you remove your glove box you should be able to see it. Its a motor that actuates the mixing door to allow only hot, only cool, or a combination of the two into the vehicle. If you can get at it and the door seems to be able to move freely, you may want to check the heater control switch for voltage change using a multimeter. Im 99% sure it is one of these two culprits. Either the actuator motor or the switch. Good luck!

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


Raise the hood, get the truck up to normal running temperature, with heater on, and see if you can feel the temperature of the hoses going in to firewall that attach to heater core. Careful, they may be hot, or at least one should be, but both should feel pretty close to same temperature. If one is quite a bit cooler than the other, then I suspect no or little flow getting through that heater core. Have a look for possibility of a flow control valve in one of the heater hose lines as well that may be malfunctioning. Another thing would be to listen under dash for movement of doors while switching temperature setting from hot to cold and back and forth.

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u will need to replace the air temperature control blend door actuator motor, this will require removal of the dash assembly, how do I know this? I am a Ford dealer tech and have done dozen's of these.

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