2002 Jeep Wrangler Alternating air vents

I'M LOOKING IN "MITCHELL I" A SPIFF WE GET HERE.

MIT 1 IS A ONLINE REPAIR MANUAL

IMMA JEEP CJ KINDA GUY

I KNOW LITTLE ABOUT NEWER JEEP VEHICLES LIKE YOURS

I HAVE BEEN SORTA LOOKING FOR YOU A SOLUTION OR A RECALL ANYTHING THAT MIGHT HELP YOU

DO YA'LL HAVE A MANUAL HVAC SYSTEM OR AN AUTOMATIC? THIS MIGHT HELP MY SEARCH. ALONG WITH WRANGLER. SE. SPORT. SAHARA.X?

THE BEST THING I HAVE FOUND THUS FAR THAT MIGHT HELP IS A "VACUUM CHECK VALVE"

SAYS IT IS INSTALLED IN THE ACCESSORY VACUUM SUPPLY LINE IN THE ENGINE COMPARTMENT---NEAR THE VACUUM TAP ON THE INTAKE MANIFOLD AND AT THE HVAC UNIT TAKEOUT (WHATEVER THAT IS/MEANS!)

I FOUND ANOTHER REFERENCE TO THE CHECK VALVE AS BEING BETWEEN THE VACUUM RESERVOIR AND THE INTAKE MANIFOLD

I'LL LOOK FOR A DIAGRAM

IF THIS "CHECK" IS NOT CHECKIN' ANYMORE, IT MAY BE YOUR PROBLEM. ON OLD FORD TRUCKS, WHEN VACUUM DROPS AS WITH PULLING A HILL, THE VACUUM WOULD DROP AND THE HEATER BLEND DOOR WOULD FALL TO "DEFAULT" WHICH WAS DEFROST. EVEN WITH A VACUUM RESERVOIR, IT WOULD STILL HAPPEN!

SO IF I FIND IT IN A DIAGRAM, YOU MIGHT CHECK IT BOTH WAYS, WITH A VACUUM GUN. OR DO THE TEST THE EZ WAY----INSTALL THE CHECK ON A LIVE VACUUM LINE SEE IF IT S. UCKS AIR FROM THE OPEN END---THEN REMOVE AND REVERSE IT ON THE LINE AND SEE IF IT S. UCKS AIR THAT WAYIT SHOULD BE NO S. UCKAGE IN ONE DIRECTION!

PICS. IN ORDER

2.5 WRANGLER

4.0 WRANGLER

WRANGLER SPORT

HOPE THIS DOES SOMETHING FOR YOU. BLOWS MY MIND, HOW YOU CAN RUIN SIMPLICITY OVER THE YEARS!

THE MEDIC

The vent door actuators are operated from engine vacuum. If there is a leak, they can change directions for you as well as not move at all. What to do is start by checking under the dash for vacuum leaks. If you are lucky, you may hear a hissing sound with the engine running. That will help locate it. Next, there is a supply hose from the engine compartment that supplies vacuum to the system. On these vehicles, chrysler used a hard plastic hose with standard rubber hose at each end to connect with. What happens over time is the hard plastic dries out and cracks. Therefore, you have partial vacuum but reduced.

Check for leaks. I feel confident that is the problem. CJ attached vacuum schematics to help. Let us know if you have other questions.

Glad to help. Let us know for sure if it's fixed.