My vacuum canister in my front bumper fell out on the trails a few weeks ago I've been driving it without 1 and it seems to run just fine, heater works no loss of power or mpg's, 4x4 high and low works fine..I don't know what this little box is uded for but would love to find out...I know the line sucks air the hole time and didn't change when I plugged it but my screw fell out and I go threw deep water alot...what the best thing to do other than go get another canister..sry I just don't see the point if it changes nothing...but once again what the heck is it even there for!...if there is another thred on this whatever my app wont search! Thanks guys!

 

https://www.cherokeeforum.com/f2/89-...anister-36423/

 

Maintains consistent level of vacuum. So when manifold vacuum drops things that are vacuum operated still work as they should. Cruise control, AC/heater controls are the two that come to mind right now.
Old cars that had vacuum operated windshield wipers when going up hill would barely move, going down hill wipe like hell.

 

Is it better to plug it or let it suck...after reading that link im thinking about getting a new one...my hvac all still work and I didn't have cruise control to begin with so I don't care...and 4x4 works awesome I just got back from the trails

 

Thanks guys

 

It's a $5 fix. Get another canister at the wrecking yard. Any canister will do.

You can just plug it and run without it, but your HVAC will not work properly under acceleration. The doors will move back and forth when the vacuum fades.

Here's everything I pulled together on it.

https://www.cherokeeforum.com/f2/vac...roblem-142261/


Dutch

 

Thanks cold....do you know if it affects my breaks on a 92...and will this prevent any kind of 4.0 raw power..I only ask cuz I puttin 33s on there with no re gear and been hearing good point from both side but re gear is how much cuz I might just do it

 

Since your brakes are 'power assisted' by the system vacuum I suppose it would be possible for it to affect the braking. But usually it's only under heavy acceleration that you would notice loss of vacuum to other systems.

But like I said. $5 at the JY and tie it up under the hood. Boom problem solved.

Dutch

 

I have a 1998 Cherokee 4.0L and mine fell out when I was replacing the bumpers but I could not find where it plugged in so it never made it off my work bench back to the car. Where does this thing plug in, on the cruise control?

 

No there is a black line with a female end on it that's all I know mine was just sitting right there I got a new one and put it just sittting there by the oil stick lol