1998 Grand Cherokee Limited vacuum operated heater flap problem.
My son just purchased a 1998 Grand Chreokee and the airconditioner will not blow out cold air. The airconditioning hoses are cold like they should be but the air is not cold coming into the vehicle. I think it may be the air/heat flap not working. Any hints as to how to repair this problem? Thanks.......Trent
Re: 1998 Grand Cherokee Limited vacuum operated heater...
Their are a few things that can make'the problum '' one is make sher that their are no fues blon''''or relays'''''2# check the wire that gos to the air pump make shur that it is not lossing cun-nc-tion like dert and grees '#3 make shur that the cluch is kiking in and out when you trun it on and off'''#4 have the system checked to make shur that the line is not clo-d''#5 have the or-fest in the line checked and have the system recudioned ''im sarry for my spelling ''is not all that grate'''hope this helps''''''my name is james e-mail is email@example.com if you need to ask any more Q'''!!!
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First ensure the coolant is not low it must be at the right level or heater won't work top off the reserve expansion tank with 50 percent water 50 percent antifreeze mixture. Repalce the thermostat, purchase a Haynes repair manual at a Advance Auto parts store for diagrams and thermostat replacement procedure.
Hi, you have a problem with your flaps that control the hot and cold air, there are flaps in the dash and they are made out of plastic and the like to break so you will have to remove the dash and renew those flaps
There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.
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
Most all late model vehicles have heater controls that are vacuum controlled. Chances are that you have a vacuum line that has either come loose, or ruptured causing a leak that will not allow the selector flap to move back and forth. If you can acquire a vacuum routing chart (sometimes these are printed on stickers located inside the hood), then routing this particular line and spotting the leak shouldn't be too much of a hassle. If you find out that your heater selector is mechanical, then there is most likely a small plastic clip that has broken causing the mechanical rod that adjusts the flap to came loose. Either way, whether vacuum or mechanical, it sounds like your selector flap isn't moving. That's what I would check first and foremost. Hope this solves your issue. Have a great day!