I have a 98 Limited & every time I turn the vents on it will blow out of the defroster with quick spouts where it will blows thru the vents for a few minutes then switch back. Same thing happens when I run the AC on. I'd really like my vents to work properly so how does one go about fixing this issue??

Thanks!

 

Either you have a vacuum leak or your blend door is sticking.

 

vacuum leak. check all vacuum lines and check vacuum tank for leaks.

 

Umm... where is the vacuum tank located in a 98 XJ 4.0L??

 

Passenger side, behind bumper. Follow the line and look for cracks. Check tank for cracks. Then check all other lines for wear or cracks.

 

Dammit I knew that was it!! When I took the stock bumper off to mount the winch bumper, I just left it on the stock bumper & never put it back on the jeep!!

 

Did you plug the line, when you disconnected it? Should be able to find one at junkyard.

 

No I just tucked the line away. No worries tho cause I'm sure i still have it, just need to make the long trek to my moms.

I hope hooking that back up fixes the problem tho..!!

 

It will. I would plug the line with a bolt for now. That's a big vacuum leak. That will let vents work and not have the leak.

I went through same thing. My tank was cracked in accident. I plugged line till I could get new tank. My vents have been working fine without it, for now.

 

NICE BRO!! I plugged it & the vents are blowin like a fat girl!!! Lmao

 

So I finally went & got the plastic black ball that the vacuum line plugs into & mounted & plugged it in. Now most is working EXCEPT that only the #4 setting works on the fan speed **** as 1, 2, or, 3, don't work...
**Anyone???**

 

Ok, Now you need to replace the blower motor relay. That is located under the dash in back of the glove box. It's a easy repair.

 

Gotcha. Will look tomorrow at it & replace it.

Thanks!!

 

Not a problem.
BTW it is hidden under a little plastic cover. The cover is held on with to or three screws. While you are under there check the plug that goes to the relay they do get pretty hot and can melt too.

 

Yeah I know my thread's a bit old, but I never got around to fixing the air flow ****, (off, 1, 2, 3, 4), that only works on 4 or Hi. So I went to Napa today & asked for a blower motor relay & told him it only works on hi & he said its not the relay, its the blower motor resistor & the darn things $50 bucks! I wasn't in full agreement nor did I have the $50, so is there a way to figure this out with a multi meter before I go spend $50 smackers???


Oh & both the resistor & relay are directly behind the glove compartment in my 98 Limited & u only need to remove the rubber stoppers to let the glove compartment swing all the way down & there they are staring right at you.


((I tried an off the shelf relay that matched up & nothing worked with that in. I priced the relay at Napa & even that's an $18 buck gamble!))