This is a dodge 2000 extended work van. At first, the a/c only quit blowing when you were trying to accelerate quickly. Now it won't blow when you are accelerating slightly or even cruising at a constant speed. It only starts to blow when you start to decelerate . Then it works perfectly.
Any thoughts?
The van has about 170,000 miles and many of those miles have been hauling a trailer and a mini-excavator, mid-sized.
2007-09-23 06:07:21 · 6 answers · asked by Mugwump 7 in Cars & Transportation ➔ Car Makes ➔ Dodge
your van has a vacuum controlled mode door in the heater box. you have a vacuum leak somewhere causing this. when you acclerate the vacuum drops off causing the door to move. now your leak has gotten big enough to not move the door at all. check all hoses for cracks or splits.
2007-09-23 07:53:53 · answer #1 · answered by sprinkles 6 · 0⤊ 0⤋
Most likely you have a bad one way check valve in the vacuum hose that serves your underdash. I saw this alot of Dodges when I worked in a shop. I have seen them suffer the same concerns you have and also a few times, I saw where the more you accelerated the air would go from defrost on the windshield, acclerate more, it would come out the panels, accelerate a little more, it would come out the floor vents. The one way check valve fixed it every time. You have vaccuum bleeding back off through a bad diahpragm in that valve. Should be located near the brake booster by the firewall.
2007-09-23 17:42:19 · answer #2 · answered by Anonymous · 0⤊ 0⤋
There are a couple of possible problems all are vaccuum issues.It is possible the vacuum switch in the dash has a leak. BUT the problem I would look at first is the vaccuum canister under the hood. This will be a ball looking or a can looking thing with 1 vaccuum hose going to it.This can is a vaccuum reserve. during low engine vaccuum this can will keep your vaccuum switch supplied with vaccuum. Deceleration has a very high vaccuum to it. Look for bad or disconnected hoses then listen under the dash for a vaccuum leak. If the engine is running and you pull the hose off the vaccuum canister you can put your finger over it and see if it still has a suction.
2007-09-23 16:02:03 · answer #3 · answered by chuck t 4 · 0⤊ 0⤋
texasm has the answer. HOWEVER, the check valve is located under the hood, I believe at the brake booster. If you cant find it, just find the vac. line that goes into the bulk head, and splice one into the line. The bad one is just letting vac. back out of the EVAC system and doesn't really need to be removed.Hold the new valve to you're mouth and suck on it. The end that you can suck air through, is the end that goes to the engine. Be sure you don't have any other vac. leaks.
2007-09-26 14:40:48 · answer #4 · answered by Jackolantern 7 · 0⤊ 0⤋
I experienced exactly the same thing with a Dodge mini van I had a few years ago...rather that spend money on it, I learned to live with it, and did for a long time. No further problem developed.
2007-09-23 13:14:21 · answer #5 · answered by ~ Floridian`` 7 · 0⤊ 0⤋
you have a vacuum leak on the line that feeds the a/c system, the leak has gotten so large that the air must be coming out mostly out of the defrost vents, you need to trace the vacuum line and find the leak, can't help you the, the leak might be anywhere
2007-09-23 15:58:51 · answer #6 · answered by Bonny R 1 · 0⤊ 0⤋