AC issue
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Cross-Country
Joined: Jan 2008
Posts: 73
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AC issue
The other day while I wiped the dust off the dash I moved the switch to 4X4 low. When I started the truck the air was on and running, but no air was blowing out of the vents because the baffles wouldn't open. I read somewhere on this forum that this is caused by a vacuum leak. My question is; where do I start to look for the leak and is it something a relative novice can fix?
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I was under the impression that only occurred on diesels, but even if you have a gas motor, I would start at the hubs. Inspect the hoses that run from the fender liner to the steering knuckle, make sure the line is on, and not cracked/split.
My old trick for engine vacuum leaks is to spray starting fluid around the hoses while the engine is running. If a hose is leaking, it will suck up the fluid and the motor will rev up. Vac leaks are pretty easy to cure, a new length of hose to replace the damaged one is pretty easy mechanicing.
My old trick for engine vacuum leaks is to spray starting fluid around the hoses while the engine is running. If a hose is leaking, it will suck up the fluid and the motor will rev up. Vac leaks are pretty easy to cure, a new length of hose to replace the damaged one is pretty easy mechanicing.
Posting Guru
Joined: Aug 2008
Posts: 1,845
Likes: 1
From: No.Va.
If you don't have a vacuum pump/gauge,try this way;
Start truck, turn on a/c and esof.
(air is defaulted to defrost right?)
plug vacuum line at right hub (line ,not the hub)
If a/c switches properly, problem is in right hub,(leak) if not re-connect and go to left hub and repeat.
If neither hub leaks,(a/c stays on defrost) disconnect line at vph solenoid and plug solenoid port.(not vacuum line)
If problem corrects,you have bad vacuum line/s (replace both)
Give a min. for a/c to switch after discinnecting lines during check.
Start truck, turn on a/c and esof.
(air is defaulted to defrost right?)
plug vacuum line at right hub (line ,not the hub)
If a/c switches properly, problem is in right hub,(leak) if not re-connect and go to left hub and repeat.
If neither hub leaks,(a/c stays on defrost) disconnect line at vph solenoid and plug solenoid port.(not vacuum line)
If problem corrects,you have bad vacuum line/s (replace both)
Give a min. for a/c to switch after discinnecting lines during check.
