AC was cold yesterday, hot today. I hear some hissing sound. - Chrysler 300C Forum: 300C & SRT8 Forums
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Old 05-20-2010, 01:30 PM   #1 (permalink)
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AC was cold yesterday, hot today. I hear some hissing sound.

Like the title says, the AC was absolutely freezing the last time I drove the car, today it blows out warm air. I hear a hissing sound, seemingly from behind the dash, and only when the car is set to vent. If I set it to the floor or defoggers it doesn't hiss, but still blows out warm. The hiss also goes away if I hit the AC button. I figured by 2006, which is the year of my 300, that they'd be done with vacuum controlled AC switches, but am I mistaken? This is a 300 Touring, no dual climate control. Any ideas or do I gotta pull the dash and look for broken/disconnected vacuum lines? Can anybody link me some service manual pages?
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Old 05-22-2011, 03:48 PM   #2 (permalink)
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I know this thread is a year old but I have the same issue except I have the dual zone set up because it is a C . The AC was working fine a few weeks ago when we used the 300 on a weekend trip. After the past week of rain here, we had our first sunny & warm day yesterday. Got in the car started driving, turned on the AC and it did not work. The air will not get cold in either the auto or manual settings and there is a " Hissing sound " coming from behind the dash that comes and goes in a cyclic fashion. My wife said that the car began making this noise about two weeks ago, however she realy has not had to use the AC much but one evening on her drive home the dash began blowing "clouds" of vapor for a minute when she put the air on, but it still worked fine for the rest of her drive. Gonna try to get the car into the shop tomorrow. I'm not well versed in AC systems, I know how it works, just dont work on them. I'm hoping its a software fix and not something like a blown evaporator. Any ideas ?
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Old 05-23-2011, 12:07 PM   #3 (permalink)
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Update :

Low refrigerant. Hissing sound is a pressure valve making noise because of the decreased amount of refrigerant. System holds vacuum for 15 minute test indicating no major leaks, Dye and 1.65 lbs of refrigerant placed into system. AC now blows ICE COLD. Gonna bring the car back in a week and put a black light under the hood to check for small leak, if detectable. Hopefully it holds or that its such a small leak that it will take another 5 years to get back to this point. Guess I'm good to go for now.

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Old 05-23-2011, 11:08 PM   #4 (permalink)
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Yup, same problem with mine. I was leaking refrigerant from where the rubber lines couple with the metal connectors at the condenser. The AC shop I took it to replaced those lines with something much more heavy duty and filled me back up, my AC is also freezing. The mechanic at the shop said it's common to leak in Chryslers there since they didn't use very beefy connectors at the condenser, so it might be worth a look there first if you're going under there with a blacklight and some leak detector.
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Old 05-24-2011, 08:55 AM   #5 (permalink)
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Thanks for the info Frankie - That is exactly where I suspect that the leak may be discovered. I realized last evening that I had completely forgot that the condenser was replaced ( along with a new hood, fender & facia ) about a year and a half ago after my wife had struck a deer.

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Old 06-09-2011, 11:56 AM   #6 (permalink)
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Update :

Two weeks later and of course the AC quits on a one hundred degree day ! Brought the car into the shop and checked for leaks. The condensor itself is a mess. The Black light & goggles revealed at least a dozen small leaks all over the front of the condensor, seemingly from corrosion, not from impacts caused by road debris. New OEM condensor coming this afternoon, should have the car back by lunchtime tomorrow. In the meantime I called the body shop that installed the new condensor 15 months ago to find out if there was a warranty on this part and why it may have corroded in such a short amount of time. According to the body shop, the part is an OEM Chrysler part, warrantied for 12 months, but none the less, should not have failed. Once the repair is done the body shop wants the part back to insure that the part that was billed for was the OEM, to see if and what defects caused this issue, and to possibly get his Chrysler parts distributor to pick up a portion of the bill and make good on this bad part.
The winter here in Jersey was a nasty one, and this state does use ALOT of salt on the roads. If for some reason the condensor rotted out because of the excessive salting it wouldn't surprise me. It sucks, but what can ya do. Just gotta make a point to hose out the grille area more often.

Update to follow......

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Old 06-11-2011, 09:21 AM   #7 (permalink)
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The car is back and the AC is icy cold again. Below is a pic of the bad condensor sitting up on the tailgate of my truck. It may be hard to see but the dye shows leaks all up and around the upper right corner. It doesn't seem to be corrosion, just failure. Alot of road bugs stuck in the lower portion - not unusual and no indication of leaks there. The dryer unit to the right has Chineese writing on it. OEM Mopar ? WTF ? Anyone know about this ? I'll see what the Body shop has to say on Monday or Tuesday.
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Old 06-27-2011, 10:37 PM   #8 (permalink)
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Quote:
Originally Posted by fm1 View Post
I know this thread is a year old but I have the same issue except I have the dual zone set up because it is a C . The AC was working fine a few weeks ago when we used the 300 on a weekend trip. After the past week of rain here, we had our first sunny & warm day yesterday. Got in the car started driving, turned on the AC and it did not work. The air will not get cold in either the auto or manual settings and there is a " Hissing sound " coming from behind the dash that comes and goes in a cyclic fashion. My wife said that the car began making this noise about two weeks ago, however she realy has not had to use the AC much but one evening on her drive home the dash began blowing "clouds" of vapor for a minute when she put the air on, but it still worked fine for the rest of her drive. Gonna try to get the car into the shop tomorrow. I'm not well versed in AC systems, I know how it works, just dont work on them. I'm hoping its a software fix and not something like a blown evaporator. Any ideas ?

You have probably low in coolant, might check it on a New Jersey auto repair shops, I put a mechanic on a set of gauges on it and see if it is empty first, the more it is the cheapest part. Most cars have a pressure in the line off the compressor if they are low on refrigerant

Last edited by carlosshane1477; 08-23-2013 at 07:59 PM.
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