If you are getting Oil in your air filter it is most likely due to the PCV Valves on the Valve cover going bad it happens a lot. the one in the rear on the Valve cover goes bad and causes it to suck oil into the filter box. replace vacume lines while your at it as they are most likely getting old to
SOURCE: finding the relay for electric fan on '89 jeep cherokee laredo 4.0
It is on the driver fender near air filter housing. Also next to the fuel pump ballast resistor. It is the white 3 inch long piece of ceramic on the fender with eletricial connectors on each end.
SOURCE: where can i find a vaccum diagram for an 89 jeep cherokee 4.0
i scanned a pic out of my manual for ya , 89 cherokee 4.0 , hope its readable.
SOURCE: 2005 jeep grand cherokee ac blows cold only on drivers side
I agree, these vehicles have a problem with the blend doors and since the accuators hit the door when it opens and closes, it breaks the doors. and it's a huge job to replace them.
SOURCE: 94 jeep cherokee 4ltr. Leak at oil filter adapter
It is very hard to turn, but it will come loose, a cut off allen wrench attached to a pipe works great, as there is no clearance to do it any other way. Have at it cause the allen bolt is pretty hefty.
SOURCE: 1999 Jeep Cherokee sport/air vents do not blow out cold or hot while it is on
this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves
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