Front A/C dies off when under load
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Senior User
Joined: Oct 2004
Posts: 197
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From: Ravenna, OH
Front A/C dies off when under load
I know the rear AC kicks to full hot b/c of vacuum. I fixed that issue.
My question is the front AC. When start out pulling a load, or climbing a hill, passing, ect the front AC dies. I don't feel any air movement, almost as if the vent closed. Is that the case? If so where is that vacuum line? I would consider pinching that line if that's the fix or manually add stop to the vent doors (if I can get to them).
I am familiar with FORD E150 2001 Safety Report #765107 which says it'a normal. Just wondering if anyone has jerry-rigged a fix.
My question is the front AC. When start out pulling a load, or climbing a hill, passing, ect the front AC dies. I don't feel any air movement, almost as if the vent closed. Is that the case? If so where is that vacuum line? I would consider pinching that line if that's the fix or manually add stop to the vent doors (if I can get to them).
I am familiar with FORD E150 2001 Safety Report #765107 which says it'a normal. Just wondering if anyone has jerry-rigged a fix.
New User
Joined: Feb 2008
Posts: 21
Likes: 0
The front a/c control runs on vacuum also. At WOT you will loose vacuum. Does air blow from defrost vents when then happens? If it does you might check vacuum check valve. On the newer vans it is located close to right side firewall area.
New User
Joined: Aug 2010
Posts: 4
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From: South Central Texas
I'm having the same problem with my 2004 E-150 5.7L. And yes, the air does blow from the defrost vents when the engine is under load. I bought a new vacuum check valve, but I can't for the life of me find where it's located under the hood! Really exact location instructions would be very helpful. Thanks
New User
Joined: Aug 2010
Posts: 4
Likes: 0
From: South Central Texas
The aggravating thing about the problem with my van is that the A/C never reverts to the A/C vents after it has switched over to the defrost vent. Sometimes it will come back on when the speed gets to below 40mph, but sometimes it just stays in the defrost vents until the van is restarted.
Senior User
Joined: Jul 2010
Posts: 140
Likes: 1
From: St. Petersburg, Florida
I'm having the same problem on my '89 E150 Club Wagon with the front unit. There is an "accumulator" in the vacuum circuit just before the A/C circuit on the main vacuum line between the manifold and the A/C circuit, and between the accumulator and the manifold there is the check valve......it may be built in to the fitting the hose attaches to.........in any event, I figure to just install an inline check valve in that main vacuum line, whether or not I can find the original.......shouldn't hurt anything to have two of them in series, huh? The way the circit works, is if the manifold vacuum drops, the check valve is supposed to close and the vacuum in the accumulator maintains the system doors as desired........but if the check valve leaks, when the manifold vacuum drops, so drops the accumulator vacuum and all the vacuum in the A/C system and the doors revert to their static positions.
hth
Vaya con Dios,
Chuck, CABgx3
hth
Vaya con Dios,
Chuck, CABgx3
Junior User
Joined: Feb 2005
Posts: 73
Likes: 1
Same problem with my 1997 E-150. I've looked at vacuum diagrams and what I gave is not even close. I also can not locate this so called Vacuum check valve. Anyone have a true vacuum diagram for this van? It is a 4.6L with rear A/c
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