Sometimes the fan blower works, tested good. checked the controls, stays on dash blowers when works, moving the dial from defrost to floor doesnt matter. I also found a small module just under the controls, unpluged it and repluged the wires worked once then nothing again
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A couple of things to check. your temp selector lever, knob from cold to hot. make sure it is moving the selector and opening to let hot water into the core.. Check listen for vacuum leak and move the controls for defroster floor etc. and listen to see if they are actuating ..these are usually vacuum operated but some are cables that get stuck at the heater temp valve. Hope this helps mike
well the ac compressor will come on if you have it in defrost mode,if heater is blowing cold ,after you just had thermostat replace ,you could possibly have air in system.now if your heater motor is not working which is called the blower motor under dash it could be the resistor that controls it also these rigs have been known for wire harness problems at heater control unit and the blower motor connector.good luck,mike
Heater is controlled by a fan switch located in your dash panel, a resistor and a blower motor. If the fan is not working the first place to check is the resistor which is located behind the dash panel in the plenum. The way to check this is remove the plug and insert a jumoer wire, if the fan runs the resistor is bad.
I dont know what these other guys are saying..I think they snif the glue!!! YOUR BLOWER FAN ASSEMBLY CAN EASILY BE REMOVED !!
1. Remove the wire
2.Find the "tab on the housing and pull it down while rotating the fan housing counter clockwise. This will remove the fan assembly. Plage 12 volts on the contacts to test the motor. If it works then the resister pack is blown. On the fan housing (near firewall ) you will see a plug going into a square looking box with a screw in it. Remove the wire then remove the screw to remove the resistor pack.. A new resistor pack is around 20 dollars at a ford dealer. Hope thie "FREE" info helps!
Have you checked the fuse? The blower fan has a resistor that controls the speed in the air box by the passengers feet. When the heater core was replaced, something could have happened to the connection or wiring. Not sure why the radio would be affected by the same thing, could be a coincidence or something dislodged under the dash. Start at the fuse and go from there.
If everything else is working, air direction and selection, blower speeds etc. Then first make sure coolant level is full if it is then make sure your thermostat is opening by watching your temp gauge on the dash and feeling your radiator hoses, both upper and lower, after the car has ran for about 10 minutes or so. Going into the engine they should be fairly close in temp. Then check your heater core for blockage by feeling your heater hoses coming out of the passenger compartment along the firewall in the engine compartment, they also should be fairly close in temp. If one is hot and the other cool then youor heater core is blocked. Also check your blend door, this is the door that controls airflow over your heater core or a/c evaporator in the air distribution compartment. When you move the control you can sometimes hear it moving from inside the car. Otherwise you will have to get up under the dash and listen and look to see if its moving. Hope that helps.
You have two systems. The heater core is a water system and the blower is an electric system.
In order to replace the heater core you had to work on the ductwork. There are a few sensors there and a wire may be unplugged or a sensor may have broke if you reinstalled a plug to a part. You may have to check the continuity of the blower resistor or anything you moved.
Find your fusebox and check for a blown fuse. It may have tripped while you removed the heater core. This would have saved the other parts.
three things left to check, using test light see if you have power at motor with key and switch on,if you do replace motor,if not locate blower motor resistor it will be close to motor,check for power going in,last is the heater control assembly