Originally Posted by PopLockLSSwap

So I've got a 2001 Cherokee. Been slowly fixing things as they come up and now I've encountered an issue that has me stumped. I can turn the HVAC controls to all the different positions and the air will be directed towards them no problem HOWEVER it doesn't matter if it's dash vent, or floor vent air will also always be diverted to the defrosters as well. Like I'm getting air from the dash vents when set to dash only, but I will also get air flowing through the defrosters with it. I don't know if it's suppose to be that way or not but I can't imagine that's the case. I've checked the vacuum lines coming from the Intake Manifold, traced them back to the vacuum lines on the side of the fender on the passenger side and to the reservoir that's behind the bumper. I've replaced one line because it was suspect and I replaced a hard line because it had a crack in it. My cruise control works just fine as well. I need to find some 90 degree elbows or something for the Manifold to HVAC vacuum line because that's super loose and just doesn't feel tight. Might have to take some line and take out the elbows till I can find more snug replacements.

Anyone else encountered an issue like this? I didn't comb over every inch of the hardline because it holds vacuum.

I've attached a handheld vacuum pump to the vacuum line that connects to the manifold for the HVAC controls and it holds vacuum and when the engine is on, it'll still hold some vacuum as I change the settings on the interior HVAC controls.
I've ordered a replacement valve that connects to the intake manifold that's for the HVAC control vacuum lines. It's the one way valve but I can blow air in either direction however I do not believe that to be the overall cause of the defrosters getting air as well as every other setting.

My second issue is the AC in the jeep doesn't seem that cold? It's not an Ice box which I get, but it also doesn't seem that cold but more COOL for max AC windows up. I've had the AC system serviced recently. As a side note, the heater also doesn't blow HOT just warm. I don't think the heater core is the issue as both hoses going to and from it are hot when at operating temp. This leads me to believe it's possibly the blend door that's the issue. I can observe the actuator motor moving the door when changing from HOT to COLD so that's working as it should, but I've also read up that the blend doors are a cheap and flexible plastic that over time are just trash. HeaterTreater is a solution I'm looking at and wanted to try and get some other opinions before I spend the money to fix this door issue.

Originally Posted by Saudade

Not sure what you did but your post appears to be blank. If I block out the text as if I was going to copy it, it shows up. You may want to edit your post and change the font color so every one can read it.. Meanwhile, I've change it in my reply.

Originally Posted by PopLockLSSwap

That's strange on my end it appears to be fine? I've edited the post and made the font white so hopefully that fixes it.