I own a 1997 mercury mountaineer got plenty antifrteeze heater cores fine but can never get heat to blow out only cold.how can i get door open manually to have heat.i know its from door not switching from cold to hot.
or what other problem could be
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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....
there is a vacuum ran valve on your heater hoses goin in to your heater core on the fire wall, they tend to get stuck shut n dont open to let hot anti freeze in the heater core, so cold air right, qwik fix is find the valve on heater core inlet and wire tie it open so antifreeze circulates no matter what, this is known on ford explorers. pretty much same truck.
Check to see if your heater core is stopped up. To do this, start the car and warm up the engine. Turn the heater on and turn the temp up. Raise the hood and locate the two heater hoses on the passenger's side going through the firewall below the windshield. Feel both hoses with your hands. If one is hot and one is cool, then the heater core is stopped up. Turn the engine off and let it completely cool. Disconnect the two heater hoses and blow through one and then the other with an air hose till it is clear. Reconnect heater hoses. If this is not the problem, then listen for a clickin noise behind the dash while the car is running and the heater of air is on.
your heater core may be getting blocked up, or the thermostat may be stuck open at times. you have a few options here, option 1 and 2 cost about the same, option 1: have the thermostat replaced just so you know its working properly, a 97 will most likely not have a telltale way of knowing if the thermostat is bad or going bad. option 2. have the cooling system flushed at a shop. this will try to clear out and debris in the cooling system that may be blocking passages or the heater core. option 3 is the most expensive. have the heater core replaced, the heater core is what provides heat to the hvac system in the dash. a few other things to check would be vacuum lines/actuator/temperature door on your hvac system.
You have an air pocket in the cooling system. To bled it out you will have to park vehicle on an incline or jack up the front end untill the radiator cap is higher than the heater core. The remove radiator cap and run engine until warm then hold rpm to about 1200 rpm's and top off coolant level until you have no more bubbles.
they radiator flush has created a blockage in the heater core that creates the heat. you dont want to replace this part because it can get $$$$. i would take it back to the shop and have them try the service again( at no charge) to see if it can remove the block