4x4 vacuum question

Reply Subscribe

Thread Tools

Search this Thread

Oct 19, 2009 | 05:54 PM

muddingmcdude

Thread Starter

Senior User

Joined: May 2006

Posts: 352

Likes: 0

From: dryden,michigan

4x4 vacuum question

well i havent been on here in a while but ... anyways i just installed warn manual locking hubs because my 4x4 wouldent work . now i turn on my 4x4 and i still loose my hvac system i did plug the lines that use to go to the old auto hubs heres my question where do those lines get vacuum from so i can plug it right from the source pictures would be awesome thanks

Oct 19, 2009 | 06:06 PM

MR5x5

Senior User

Joined: Mar 2007

Posts: 473

Likes: 3

From: Issaquah, WA

Look above the right front fender well for the balck coffee can looking thing. That is the vaccum canister. One line will track to a solenoid valve bolted to the fender well. Plug that line before the valve and you will have isolated the 4x4 aspects of the system.

Oct 20, 2009 | 10:48 AM

miller_feed

Hook it, I'll pull it.

Joined: May 2007

Posts: 15,037

Likes: 4

From: Grand Lake, La.

You don't have to plug the vacuum line. Just unplug the connection on the solenoid for the front hubs that sits on the passenger firewall. The solenoid will not send vacuum to the hubs with this unpluged Here is a pic of it unpluged.

Oct 20, 2009 | 11:06 AM

PaysonPSD

Post Fiend

Joined: Nov 2007

Posts: 9,549

Likes: 14

From: Payson, AZ

Pic of vacuum system from Passenger side.

Oct 20, 2009 | 11:57 AM

SpringerPop

Hotshot

Joined: Jan 2002

Posts: 17,988

Likes: 207

From: La La Land

Also, be SURE to plug off the vacuum ports down on the hubs, as you will allow dirt and water into them otherwise.

Pop

Oct 20, 2009 | 12:51 PM

brian42

Lead Driver

Joined: Dec 2006

Posts: 7,092

Likes: 145

From: San Diego, CA

Quote:

Originally Posted by miller_feed

I agree with miller_feed. If you already disconnected the hubs and plugged the lines and you are still having vacuum problems when you click in or out of 4x4 (defrost on the ventilation), then all I can think of is poor line plugging, crack/split in the line or a bad solenoid. If you disconnect the line going TO the solenoid from the vacuum system (should come from either the pump or the reservoir), then you've isolated the whole hub locking portion from the system.