Question about 1999 Mercury Grand Marquis
The car gets up to normal operating temperature in about 5 mins or so. It does not run hotter or colder than it always has. I had to charge the A/C this summer. I felt the hoses and the top radiator hose is warm. the two hoses that flow through the firewall on the passenger side ( heater core ) are both warm. A/C works fine this summer after i charged it. the A/C blower does seem to run on high regardless of setting, ie.. even on low it will run low for a bit then blow full blast. Checked coolant level, all good 50/50 mix. Checked 30 amp fuse for heater appears in tact. What's up??
If you can put your hand on the heater hoses and keep it there, then the T-stat is bad. Heater hoses and radiator hoses should get hot enough that you can't hold them. 212 degrees+
Posted on Nov 18, 2014
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Posted on Jan 02, 2017
If the hoses to and from the heater core are hot , and you say the heater core is hot , then the only answer is that the air duct that flows into or out of the heater core plenum ( housing ) is not opening.
Heater control on dash borad inoperative.
Not sure about 92 capri , some cars have a cable linkage , some work on vacume motors.
Try to find a haynes manual for your car , they will walk you through almost every step of anything you may ever want to do to your car.
You seem to know what you are doing , but I gotta ask ........the heater core you felt was up behind the dash inside the passenger compartment of the car right ?
Posted on May 10, 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
Sounds like a faulty blend door under the dash. The blend doors direct air thru the heater core and the vents. Your model should have vac controls so you could have a vac leak or a stuck door.
Posted on Oct 10, 2012
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