I have a 2004 Mercury Mountaineer. Heat works great in the back half of the car but no heat from the fans in the front. Front blows cool air. Checked the heater hoses and one is warm and the other is hot. Thermostat has been replaced and the system flushed to check for possible debris. What could be the problem? I was told if the hoses are hot/warm that it's not a bad heater core. Is this right? Please advise....trying not to spend $1500 to replace a heater core if that's not the issue.
I would take a closer look at the heater control valve located in line with heater core hose.it vacuum controlled to close coolant flow to heater core when a/c Is on.it's located by the radiator on passengers side.it has a black plastic lever on it, and the body it aluminum. The lever breaks internally, causing low coolant flow to heater core.remove and you will find white sludge build up. Replace and be on your way....
SOURCE: temp guage showing hot, not getting any heat for 1992 Mercury Cap
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 ?
SOURCE: 2002 mercury sable heater wont get hot
you have a broken or stuck temp blend door in the heater case. or the servo motor is broken. this sits on top of the heater case
SOURCE: 2002 Mercury Sable, Heating Problem
Hello. You are in luck. I just had this same issue in my shop this week. We changed the thermostat, and replaced the coolant. Fixed it right up. Since you did not mention a new thermostat, that would be my next move, if I were you.
SOURCE: Low Heat on 1999 Mercury Cougar
I had the same problem with my 199 cougar 2.0 4 cyl.
The problem was air in the cooling system.
I had to bleed the air out of the system, and now the heat
works much better.
I put a flushing tee between the back of the thermostat and
the heater core, and made sure that water flowed out of there.
Then I disconnected the small hose from the top of the coolant
resevoir, and poured water into it using a funnel until the coolant
level started to rise in the coolant resevoir. Then started the car, left the radiator cap off, and let it come up to temperature (thermostat open)
then over a period of about 5 minutes, periodically "goosed" the engine to clear any remaining air bubbles.
The heat is MUCH better now.
SOURCE: my 2000 mercury sable the
Have you checked for air in the system ? Some of the V-6 engines have an air bleeder on top of the intake manifold to release trapped air. What you do is fill the rad to the top , start the cold engine and open the bleeder untill fluid comes out meaning the air has been vented. With air in the system the heater does not transfer heat efficently. You can also vent an engine by squeezing the upper radiator hose with the engine off and cold. Never open a hot system. The squeeze method is easy. With cold engine remove the cap and fill the radiator almost to where it will spill over. Then slowly squeeze the upper radiator hose and you will see the air escape. When you release the prussure you will see the level drop slightly. Now if you do not have air in that system you will need to check the heater core flow. With everything closed up and full start the engine and let it warm up. Now feel the two hoses in and out of the heater core where it goes thru the firewall in one is cold and one is warm then your heater core is plugged. You can try a flush at this point but it usually needs to be replaced. Thanks for asking at Fixya.com.
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Sounds like a blend door issue . There are several actuators that open and close small panel doors that direct and redirect heat and or AC. Nothing wrong under hood . Instead check for a bad actuator , most likely mounted to your under dash system . You can check power to these as you move your controls to move your air around in the vehicle. If no luck there check for a broken or stuck blend door .
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