Question about 2002 Mercury Grand Marquis
HEATER BLOWS OUT COLD AIR
Posted by Anonymous on
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Posted on Jan 02, 2017
compressors do get old & dryer/accumulators do get less efficient. if you have a poor cooling fan or cooling system those also can affect A/C performance, ovefull refridgerant system can also affect the performance. I would have a reputable shop inspect system performance & make sure you have the CORRECT amount & type of freon in the vehicle. If repairs are required make sure you upgrade to R134A . It's much less expensive & up to date.
Posted on Oct 15, 2009
SOURCE: mercury 2003 gand marquis heater
One of 2 things could be happening. #1, the valve that allows coolant to circulate thru the heater core is not functioning. #2 the door that is actuated to allow cabin air to circulate around the heater core is not functioning properly. Possible causes, linkage to the valve, or actuator not working. Also a broken valve to the heater core. A vacuum leak, or faulty actuator would cause the door not to function. You can narrow down the problem somewhat by making sure that both heater hoses have hot coolant in them. You can do this by simply feeling the hoses. If they are both circulating hot coolant, then the problem is the misdirection of air flow. To repair this, the cause will have to be diagnosed, could be anything from your dash mounted controls to an issue with vacuum or the ductwork or the door or actuator. If not in the controls, the dash may have to come out. Good Luck, I hope this is helpful!
Posted on Nov 18, 2009
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SOURCE: 2003 mercury grand marquis LS
The blend door is stuck in cold position. That usually happens because the blend door actuator has failed.
You will need to test and replace the blend door actuator.
To replace the actuator you will need to take apart the dash and remove completely the instrument panel,d isconnect the connector, remove the four screws, remove the temperature blend door actuator and replace it.
The replacement is not a job for beginners, since you have to take apart the dash to access the actuator.
Posted on Nov 18, 2009
Hello. The most common cause for no heat is the thermostat. This is a quick and easy repair. Go to any autozone or similar parts store for the part. They may even install it for you.
Posted on Nov 20, 2009
Remove the center console and on the drivers side toward the bottom of the heater box will be a small electric blend motor. Replace this motor. New part should be about 90 usd. After the center console is out should be three small bolts holding it in.
Posted on Oct 06, 2010
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