Lowrange2

I've been fighting this issue for 2 years now. I guess I'll have to rip the dash out to really trouble shoot the issue.

Rogue4x4

Did you ever get a Mighty Vac?


LOVE mine. Great for bleeding hydraulic systems, as well as diagnosing vacuum issues.

Lowrange2

Yeah. I have a leak somewhere inside the dash. I can pull a vacuum on the small line going into the firewall and it doesn't hold.

I pulled the HVAC control panel out, plugged the small line going through the firewall and pulled a vacuum on that same line from the other side. Still won't hold pressure so I'd say the main vacuum supply line is cracked.

Gmartin

Thank you for the reply. The problem I have is that the break in my house is right at the base of the connection to that little tea joint. Does anyone know what that tube is called or maybe a reference number that I could use to purchase a new one?

Much Aloha

Gmartin

My speech to text on my phone is not that great but I think you get the idea

CCKen

Can you take a photo of what you are talking about and post it here?

Gmartin

Does anyone know the part number for this hose on a 99 cherokee? Because its broken right at the connector I think Ill need to replace and splice further back. <br/><br/>Thoughts? Advice?

CCKen

Is the nipple on the check valve broken off? If not use a section of rubber hose to splice from the check valve to the broken plastic tube that goes to it.


O'reilly has the hose. As I recall it's called windshield washer hose. In any case, it's a small inside diameter hose.

Gmartin

Yeah the connector is essentially broken off. It was hanging on by a thread but when i tried to replace the tape i think it snapped. Originally when I taped it up the aircon got enough pressure to switch to the vents and was blowing cold. Now its not

CCKen

Go to the junk yard and snip out a tee with ample tubing on both sides of the tee and out the front, then splice it in using rubber hose. If you can't find a Jeep with a check valve try it without one. Certain years did not use a check valve so you may be able to get away without one.


Edit: O'reilly does sell a check valve similar to the one used on Jeeps. You may want to give one of these a try.


Edit 2: See post #15.

madmanmarty

This is really good info for someone with a hvac issue.
Vote for using this is a hvac sticky.

scorpion66772

Or you can just go to the hard line and slip a piece of rubber hose over the hard plastic line then over the fitting on the valve.