1998 explorer -Only hot air due to broken hot/cold air partition.
Apparently the partition/door ( not sure if thats the right term ) that moves back and forth alowing hot or cold air to come through vents when set to the ossociated setting has broken, the motor that drives this is fine and i believe the replacement part is relativly cheap but i need to remove the dash to replace it. Has anyone tried taking the dash out and if so, is it as difficult as many mechanics claim or are they just trying to bump up the costs. cheers
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Re: 1998 explorer -Only hot air due to broken hot/cold...
Removing the dash is depending on your mechanical skills not that difficult. You have to disconnect the outside evaporator case from the firewall to gain acces to the heater case attaching nuts. I believe the only way to get the door is the complete heater case. If you are not comfortable removing a dash,have a professional do the job
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In most case this is caused by a defective air temperature control blend door actuator motor and blend door being stuck due to heat warping from the heater core. The parts are located inside the dash and the dash must be removed to service them. My suggestion is have a well trusted shop that knows AC systems problems on Ford check it first before you pay the $1000.00 for the repair of the above parts.
If you are sure the engine is getting up to temperature then your problem will be a part called the electrically positioned blend door and or the little motor that moves the blend door. The blend door moves back and forth between the AC core and the heater core to provide a mix of hot and cold air or hot or just cold depending on what you set the air temperature control at, blue being cold and red being hotter. This is all to common a problem on Ford rangers and Explorers which share the same components of the heating and AC systems. When the door fails it is usually on the cold setting position. The kicker here is that you must remove the dash to replace the parts, the blend door and the blend door actuator motor should both be replaced at the same time, the common reason for the motor to fail is a sticking hard to move blend door due to warping of the plastic it is made from.
There is a part called the air temperature blend door inside the air ducting of the dash, it controls the air temperature by moving between the AC Evaporator core and the Heater core, it is broken or the electric actuator is defective that moves it or more commonly both are defective. To replace these parts requires the dash be removed from the truck. This is a VERY common problem with 1995 up Explorers.
Check the motor on the top of the heater plenum. It turns a shaft to shift the blender door
which controls the input to this plenum either the heater core or the evaporator core (ac). You may find the motor is OK but the shaft (plastic) has broken and the blender door has to be replaced. This is a costly job that involves removing this plenum after removing the dash. A shortcut I found online was to cut a hole under the blender door and replace it through this opening. After replacing you can seal up the hole with epoxy. I cut three sides of a square hole leaving the back uncut. Pull down and the blender door can be removed. My problem was on a 1997 Explorer.
that switch controls a vacuum operated door that lets a/c or heat thru.when accelerating,the vacuum in the engine changes so it sound like a vacuum issue.take apart the center stack and there is a vacuum actuator in there connected to the flap door .i have seen those have issues with the metal tab broken away from the plastic that moves it.is the a/c piping cold under the hood where it goes into the heater a/c assembly?the compressor should be cycling on and off and the pressure tested.
I had the same problem with my 98 ranger. the problem is the hot cold air blender door. on my truck the the top of the door where the electric actuater is placed broke and no matter what you selected on the controlls you would get hot air. to verify that it is not the A/C place it in the Max A?C position. this will cut off hot coolant to the heater core and you should after a few minutes get cold air. if that works you can find the actuator locaed behond the glove box door on top of theplastic duct next to the blower motor. the only way to fix the problem would be to replace the unit or do what I did I glued the actuater spindle to the blender door. make sure the actuater is in the same position as the door or it wont work.