Wild vent workaround
Legend
Joined: Nov 2014
Posts: 8,098
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Anyway I can help! That's what this forum is for. The only reason I recommend this check valve over the original designed ones that you can get for like $5 at Napa is it has a mini reservoir in it also. And therth what I like about it.
Thread Starter
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Professional
Joined: Jan 2018
Posts: 156
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From: Wilson NC
I had wild wacky vents and fixed it with the check valve Dorman 47170. The Dodge dealer actually looked up that Dorman part number for me when I went to them to get the OEM part. They wanted like $25 for it and it was special order. They told me to go to any auto parts store and get the Dorman part. I think it was under $5.00. I bought 2 but I can only find a use for one. (I thought there was another one somewhere but I think I was wrong)
My plenum was leaking bad. I was using tons of oil. The check valve fixed it even with the very leaky plenum. Later I fixed the plenum but the check valve was the cause of the wacky vents.
Before adding the vacuum reservoir did your cruise control work? Could you shift into 4 wheel drive? Have you replaced the checkvalve? When I pulled my old check valve out, I could blow through it easily in either direction. (in fact you could see daylight through it) Mine was where it had a "T" near the back of the valve cover on the passenger side of the vehicle.
My plenum was leaking bad. I was using tons of oil. The check valve fixed it even with the very leaky plenum. Later I fixed the plenum but the check valve was the cause of the wacky vents.
Before adding the vacuum reservoir did your cruise control work? Could you shift into 4 wheel drive? Have you replaced the checkvalve? When I pulled my old check valve out, I could blow through it easily in either direction. (in fact you could see daylight through it) Mine was where it had a "T" near the back of the valve cover on the passenger side of the vehicle.
Amateur
Joined: Jun 2017
Posts: 48
Likes: 0
V65Ozzie, When I had the wacky vents it would switch to the right position at idle. (when the vacuum pressure is the highest) As I would accelerate, it would go from the middle vents to the floor and if I gave it gas long enough it would switch to the defrost vents. I might be wrong it may have been middle at idle then defrost, then the floor. Something like that. The checkvalve was really bad. (the one right off the intake manifold) I could actually see daylight through it. Changing that one check valve fixed it for me. (with a terrible plenum leak) I found the second one thanks to people on here and changed it as well. I didn't really see much difference. It may switch to the desired vents a little quicker or maybe that is the placebo effect playing tricks on me. I hope you can track it down. If that additional reservoir fixes it then maybe you don't have to worry about it.
Thread Starter
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Professional
Joined: Jan 2018
Posts: 156
Likes: 0
From: Wilson NC
V65Ozzie, When I had the wacky vents it would switch to the right position at idle. (when the vacuum pressure is the highest) As I would accelerate, it would go from the middle vents to the floor and if I gave it gas long enough it would switch to the defrost vents. I might be wrong it may have been middle at idle then defrost, then the floor. Something like that. The checkvalve was really bad. (the one right off the intake manifold) I could actually see daylight through it. Changing that one check valve fixed it for me. (with a terrible plenum leak) I found the second one thanks to people on here and changed it as well. I didn't really see much difference. It may switch to the desired vents a little quicker or maybe that is the placebo effect playing tricks on me. I hope you can track it down. If that additional reservoir fixes it then maybe you don't have to worry about it.