Question about 2004 Mercury Grand Marquis
If the heater is only blowing out cold air, you may be low on water/antifreeze in your radiator.
Also, check the temperature selector may have disconnected or come loose.
Posted on Apr 04, 2015
Turn your air conditioner OFF and turn your heater ON. Air conditioners were designed to blow out one temperature of air... COLD.
Posted on Apr 02, 2015
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Posted on Jan 02, 2017
It appears we have an Air lock scenario and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
If persistent boil ups/over attention must made in the cylinder head
or gasket area, or possibly water pump?
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Posted on Mar 01, 2009
Check and see if the clutch on the front of your compressor engages. If not it could have a leak and not have any freon in it. If it has freon then you have an electrical malfunction on the ac system.
Posted on May 18, 2010
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