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im having trouble locating the issue with my heat. no matter where i switch the output to it will only come out of the defrost. ive checked all the obvious vacume lines and the controls behind the dash. anyone know what else i should look for?
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#becauseJoeNitro -
Heater Core? Blower motor?sigpic
Official Space Shuttle Door Gunner of the Chechnyan Space Program -
there are 2 blend doors in the heater box. the first one controls the amount of air that goes through the heater core giving you different temperatures and the second one determines which ducts the air can flow through which sounds like your problem. Im not really sure what is used to move the doors in your jeep but newer cars have electric motors which go bad. Some times the doors will also get stuck in a certain position because something is blocking it.99 xj, 3" RC, 35" BFG AT red labels, custom rear bumper, SYE, armor, Hellas, waggy 44's fr+rr, 5.13's ,lunchbox lockers fr+rr, rear disk conversion,rock crusher covers frt+rr, beefy homemade 1 ton highsteer setupComment
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sounds like blockage to me....... common to poo brown two doors i hearComment
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Def a vacuum line somewhere. I guarantee it.
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yup... check your vaccum lines...Originally posted by DrThunder View Post
ive had like 5 people say this to me before.. and they all had the same problem... NO VACCUM BALL THINGY... but check for leaks around there or along that line....Originally posted by Ktmracer419Comment
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Got a smoke machine?sigpic
Official Space Shuttle Door Gunner of the Chechnyan Space ProgramComment
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Im gonna go with heater core blockage...theres 2 hoses coming from the firewall, disconnect them and remove the heater valve thingy..put a hose to each end a few times and watch the mud come out...re-attach the hoses and you should be all set..The heatercore only holds roughly a quart of water so dnt worry about your coolant mixture being off.98 Cherokee, D30/8.25 w/4.56s locked F/R -- 3 link front IRO springs rear with shackle relocation, one ton steering w/heims, hybrid cage under contruction, 33'' KM2'sComment
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I dont think he is having a heat issue (unless he left something out of the original describtion). His vents have defaulted to defreost so that if he were to drive it now he could still defreost his windsheild and see where he is going.
2000 XJ with goodies soon to be in pieces
1999 XJ will get most of the 2000XJ doodads.Comment
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the heat works fine it hot. and i can change it to cold i have control over the temp and the speed of the blower just not over where it comes from. just out of the upper vent on the windshield "defrost". im gonna recheck all my vacume lines and look for this door justin is talking about.#becauseJoeNitroComment
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Don't waste your time on the door, hook up a vacuum gauge and tell me what it reads, then I can definitely confirm you have a vacuum leak. Trace lines cause somewhere there is an open end or significant break.Comment
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My heat will switch from the floor do defrost and I dont have a "ball thingy"I don't always drink orange juice, but when I do, I prefer to chew it. #madpulpComment
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do you think that useing a smaller vacume tank from a 98 on a 91 that had the larger volume tank would effect it. cuz thats what i did. i broke the stock one and only could find a smaller 97+ one at the JY. im talking about the tank in the bumper.#becauseJoeNitroComment
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Mine fell off this weekend and all I did was plug the line that goes into that tank. Everything works fine thoughOriginally posted by JoeNitro View PostI don't always drink orange juice, but when I do, I prefer to chew it. #madpulpComment
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hurmmm#becauseJoeNitroComment
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