Have a 95 Jeep Wrangler. The fan that defrosts the windshield and windows quit working. Heater works but no air is being blown. I think the problem could be the switch for the fan or the fan itself. Where is the fan located?. How do i test or replace the switch? Is it difficult to replace the fan or the switch?
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Re: defrost fan quit working.
Check it with a test light or Multimeter for power to blower motor first, with switch on high. If no power to motor, problem is elsewhere. Here's a link that will help you. Click on the pictures to expand.
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Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.
Does your heater fan turn on? If not, could be a fuse, could be fan motor, could be wiring connections. If heater fan works then defroster switch may be the problem, or connections to the switch, or again a fuse. Temperature controls may have some effect. Usually, defrost needs heat to work well. The engine needs to warm up.
the oily substance you talk about is antifreeze, your heater core is damaged and leaking in the form of mist and going to your windshield you must replace your heater core in the dash generally behind the glove box.
My son's jeep had the same problem. The actuator that controls the the defrost damper came out. Pull the radio out of the dash to gain access to the damper. Looking into the radio hold on the right side you can just see the arm. Move the heater control switch and you can see it moving around. I put a drop of instant glue on the end and pushed back in and its been fine.
i just went thru this problem with my 95 1500. on mine it was the controls just like you discribe on yours one for fan one for temp and one for settings.first i thought it was the heater blend door acturator. its located on left side of heater next to the gas peddel. pulled the wire plug out and test for power theres 3 wires to this plug one white one brown and one black. the brown wire was hot with key on the black is ground and the white is the one that sends a siginal to this electric motor witch redirects air flow from floor to dash vents to defrost. i had to order the controls thru autozone 135.00 with shipping. you might get lucky and find one at a bone yard the ones in my area dident have any. i almost bet you will find thats your problem too. good luck OLD SCHOOL.