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07 uplander no a/c hiss from vent
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case310350
Novice
Mar 12, 2012, 10:04 AM
Post #1 of 14
(5474 views)
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07 uplander no a/c hiss from vent
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Have a 07 uplander with 3.9engine and 70k miles. When I bought the van I did try the a/c I could here a hiss from the vent, and it was very noticeable and when I turned the a/c off, the hiss would slowly go away. I assume there is a leak on the high side. The previous owner show me a receipt where the dealer looked at the a/c and found no problem.
I have no a/c now unless I charge and that will last for about 10 minutes. So How hard is it to get to the system components, does the dash have to come out.
I have done some work on systems before, but certainly not an expert. Looking for some tech advice thanks
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 12, 2012, 1:19 PM
Post #2 of 14
(5443 views)
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Re: 07 uplander no a/c hiss from vent
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This is not a job for you. Diagnosing A/C requires a lot of "hands on" experience. You have a major leak that needs to be found.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 12, 2012, 3:40 PM
Post #3 of 14
(5427 views)
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Re: 07 uplander no a/c hiss from vent
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The Dumplander has an expansion valve. If the system gets low on refrigerant from a leak somewhere, you'll hear hissing through the expansion valve that is bolted to the evaporator. Doesn't mean there is a leak making that noise. You need to take it to a shop that can recover what is left in the system and then dye and recharge it or sniff it out. Don't try recharging it yourself with a suicide can kit. You over or undercharge and you'll end up paying huge bucks later on.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 12, 2012, 3:45 PM)
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case310350
Novice
Mar 12, 2012, 8:31 PM
Post #4 of 14
(5403 views)
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Re: 07 uplander no a/c hiss from vent
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Well I was hoping for some technical advice specific to the uplander. A/c systems of this vintage are not that difficult to fix. I have recharged many systems as well as found leaks using dye. Nothing to be scared of. I guess I know more than most here. Oh well I bit the bullet and get the repair manual to find out how to get the evaporator out. I have an uplander I use for work which does not have the hiss. So may just be the oring, which might mean the high side is over pressure.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 13, 2012, 3:16 AM
Post #5 of 14
(5393 views)
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Re: 07 uplander no a/c hiss from vent
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Man, the fools just keep coming.....................................
You're just the smartest guy I ever met. If it's hissing that bad, just put a bucket under the dash and catch the leaking refrigerant.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 13, 2012, 4:52 AM
Post #6 of 14
(5389 views)
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Re: 07 uplander no a/c hiss from vent
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Well, good luck with that. Let us know how things turn out.
Don't understand why an evaporator that causes an audible hissing sound from a leak at the core would only hiss when the system is turned on. There is more pressure in the evaporator when the system is turned off than when the system is running. I guess you know more about AC systems, so maybe you have an explanation for that.
I just had a BMW 325i last week that was hissing out of the vents and it was because the system was low on charge and the expansion valve was hissing. I noticed a couple of wet o rings at the condenser connections. It wasn't because of a leak in the core or the expansion valve causing the hissing sound. Recovered 3 ounces, replaced the o rings, dyed, vacuum and recharged to the specified weight and the hissing sound went away and it blew cold. Told the customer to drive it and bring it back later on to see if there are any other leaks.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 13, 2012, 5:12 AM)
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case310350
Novice
Mar 13, 2012, 7:48 AM
Post #7 of 14
(5376 views)
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Re: 07 uplander no a/c hiss from vent
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so many well thought out comments, you ave been very helpful...... the bucket is a good idea
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 13, 2012, 11:31 AM
Post #8 of 14
(5367 views)
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Re: 07 uplander no a/c hiss from vent
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Welp, I'm done. I guess i'm just wasting keystrokes.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 13, 2012, 12:14 PM)
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case310350
Novice
Mar 13, 2012, 3:37 PM
Post #10 of 14
(5346 views)
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Re: 07 uplander no a/c hiss from vent
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well if you nancies need any help or advice let me know. Fortunately other boards were more helpful. Very disappointing here if the only answer you get is don't do it not very much info exchange. Do you guys put air in your tires or take it to a pro??
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 13, 2012, 3:46 PM
Post #11 of 14
(5343 views)
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Re: 07 uplander no a/c hiss from vent
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That's the difference. We are the pros.... you just think you are and that is dangerous. Everybody thinks A/C is just a piece of cake............. until everything goes to hell, and it will eventually.
The thing that speaks for success in A/C repair is not the result when you finish, it's the result 6 months from when you finish. That's the point that separates the pros from the wannabes. Anybody can make a car cold for a day or two.............. well....... maybe some can't even do that.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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case310350
Novice
Mar 13, 2012, 4:03 PM
Post #12 of 14
(5339 views)
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Re: 07 uplander no a/c hiss from vent
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Never said I was a pro but if you don't learn you stay still. I have been very sucsessfull repairing ac systems on various cars, there are not many components and if you know what each does and have gauges its relatively easy to troubleshoot. The only difference it will take me longer. now 2010 systems and newer are a different story...
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 14, 2012, 8:35 AM
Post #14 of 14
(5296 views)
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Re: 07 uplander no a/c hiss from vent
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You guys crack me up. I learned EVERYTHING ever known about A/C in a week (right) let's call it right MVAC = Motor Vehicle Air Conditioning vs HVAC.
Go get a death kit at Wally World and wonder why it just cost you perhaps THREE thousand bucks!
Just a locked and amusing thread now,
T
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