I had work done on my car years ago to replace the heater core on my vehicle and ever since then, the air barely blows through my vents. i can hear it and it works on all levels but i'm thinking that it is blowing out and behind the console. The heat works and the ac gets cool...but it takes a long time because it doesn't come through the vents well. Is this something that anyone has come across?
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Re: 1998 FORD EXPEDITION AC/HEATER BLOWER
This problem is caused my the blend door actuator motor, the electric motor turns to allow the flap to open either to cool or heat and then through the vents. The problem has been either the motor is going bad or the actual motor stops working. There are small plastic gears that strip in the motor causing this. I have replaced several in the rear unit. The front one is under the dash next to the heater core. The dashboard must be removed. It is a big job.
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There may be a corrosive in the system. Flushing the system should be done at least every 2 years. Your vehicle is now 12 years old, but I have not seen a heater core go bad in 10 months, it may have been defective, and should have some type of warranty.
I ASSUME THIS IS A 98, THIS PROBLEM IS CAUSED BY A PART CALLED AN "AIR TEMPERATURE CONTROL BLEND DOOR ACTUATOR MOTOR" THIS MOVES A DOOR BETWEEN THE COLD AIR FROM THE AC AND THE HOT AIR FROM THE HEATER CORE, YOU WILL NEED TO REPLACE THAT ACTUATOR. .
You need to but a scanner on the computer and activate the AC. If it does not activate you may have a bad PCM. Also if the pressure in the AC is low it will not run. Also you have a AC relay in the engine fuse box.
Now for the bummer part. I have this same truck. Replaced heater core and I didnt get the blend door quite on track and it jammed. I had to take the dash off again. Also your center heat control may be bad.
I don't think these two problems are related. Even without AC your heat should work. Do you have rear climate control also. See if that works. If it does you may have a jammed door for the dash area
Listen and see if the vent flap is moving from the hot position, to the cold position. If that's working then the evaporator may be clogged. It sits inside the same box that the heater core is inside of and if it becomes clogged with hair or dust, then it wont allow the blower to blow through it. But it would then bring hot air through the vents because the heater core is there too.
Common issue. Your air ducts were not reassembled properly and so the blower fan is working but the air is going out wherever the air duct is improperly fitted. Also the fan gate ( a metal gate that is used to block off any heat entering the system when you have the a/c on may be stuck in the close position. Whatever the case it can be repaired by getting in the sysem under the passenger side of the underside of the dash. You may want a professional mechanic to perform thid because it is a bit of a job to access all of the items needed. Hope this helps!!!
i had this exact same problem with my 98 explorer. your blend actuator (blend doors) are not morking. these are on the passenger side under the dash. getting to them will be dificult, but it can be done. you will need to take apart the heater box, to fix them. (the big black box under the dash).