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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

88 Lincoln Mark VII, LSC Sedan, No Heat
Q: I have recently moved to NH from Miami, Florida. As soon as I got here I realized I had no heat in my Ď88 Lincoln Mark VII, LSC. I took it to a local dealer and their diagnosis was the water pump needed to be replaced and it needed to be flushed. My lady friends son is a pretty handy fellow when it comes to repairs, so I asked him about this and he said this didnít sound quite logical. (Water pumps are to cool engines, not heat them.) We have flushed the engine and put in new coolant, replaced the thermostat, and checked the flow of water into the heater core and out and this appears to be normal. We also replaced the coolant temperature sending unit. Still no heat to speak of. Further, I have the control set for 90 and we get just slight warm air from vents (you have to place your hand on the vent to feel the slight heat; if this temperature is lowered to 85 degrees, the next setting, the vents blow real cold air not any heat! Any suggestions to solve the problem? Sure would feel nice to ride in a warm car in this NH winter. Thanks for your help.

A: First, water pumps do not cool the engine. The water pump merely allows for the circulation of coolant. It is the coolant that allows for the transfer of heat whether to the heater or the radiator. If a water pump does not provide good coolant circulation a heater will work poorly and the engine can operate too hot at the same time. It sounds as if youíve covered the basis with the cooling system service you described. If all is correct then the problem is likely to be with the heater control system of the vehicle. The automatic climate control system in your vehicle does have built in diagnostic abilities. To enter diagnostics you have to push the Off/Auto and Defrost buttons at the same time. When the climate control computer enters into self diagnostics the display at the heater control panel will display numbers, (example 01 which would indicate that a blend door is out of position. There are 15 different codes that the computer can display as reference to the diagnostic procedure needed to effect a repair on the heating system. To exit the self diagnostic mode you have to push the cool button. If you donít, the heater will stay in the diagnostic mode and will not function at all. You may want to have a technician that is familiar with your vehicleís climate control system perform the diagnostic and repairs.

 
     
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