SOURCE: 1999 Lincoln Navigator Heating Problem
if the heater core is getting hot then the problem is the air temp control blend door actuator, a common problem.
SOURCE: climate controls
Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.
SOURCE: new climate control unit but when on blower not working for heat or ac
I'm assuming the problem is the blower motor isn't coming on or working. 1st, check the fuse. 2nd, remove the glove box or pull the 2 tabs that act like stops when it's open ( the glove box will open out further) and you'll see the power plug connector for the blower unit. Turn on the blower through the climate control (heat, A/C, or whatever) and wiggle the connector to see if the blower turns on. If starts working, then an easy solution is pull the connector off and gently press the prongs together or inward. Then carefully reconnect with damaging the prongs. This worked for 96 Mark VIII due to the fact the prongs were not "seating" correctly in the female connector. It's been about 2 years since I did this and the connection is still good. If wiggling the plug doesn't work, pull the plug, turn on the climate control (heat, A/C), and check for voltage to the plug. That's about all I can help with.
SOURCE: 1997 Lincoln Town Car; nothing but heat
check your vaccum lines behind the dash. if you find the one that goes to the blend door, put some vaccum on it and see if it opens and closes for you. if not, then yes, your blend door is broken. if it closes, check your temp control gauge.
SOURCE: 1998 lincoln Navigator --- 1. NOT
It can be the heater core but can also be the water control valve or the blend door actuator.
Please see my tip at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info. First make sure your heater control valve on the heater hose is actuating properly when you change the temperature. The valve looks like the picture below.
If this is working, check the temperature actuator under the dash. If you system is cable operated, the cable sheath may have slipped the clamp. Make sure the door opens and closes all the way wheh the control is switched from hot to cold. If you have questions along the way, please let me know.
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