Question about 1998 Mercury Grand Marquis

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I have no heat replace tthermostat,anitifreeze,the hose , I have good air cominng out of the vents last years I had a small bit of heat when I turn on the heat but this year none. what do you think It is?

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  • Expert
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Assuming the car does not overheat (Ruling out the water pump), I would look for something not opening the heater door. I think this car uses a pneumatic system to open the door for the fan to blow air over the heater core. If that door does not open, you won't get any heat. You probably have a cracked or broken pnuematic line behind the dash that controls the door.

Posted on Oct 26, 2012

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Feel both heater core heater hoses if both are hot.more likely problem air door not opening due to faulty stuck air door or problem could be in the mode switch or air door actuator damaged not working. if one of the heater cores hoses one leading to heater inlet but out let hose to heater core cold more likely heater plugged need have coolant system flushed.

Posted on Oct 26, 2012

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SOURCE: 99 mercury sable 3.0l

have you checked the coolent level?

Posted on Dec 27, 2010

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Heat/ac


Hello,
You would be wise to check all the small rubber hoses under the hood as it would appear that you have a vacuum leak preventing the airflow door from moving to any other position. Look for cracked /cracking, split hoses or disconnected hoses and replace as necessary.

Good Luck!
Rich Lilja

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