A/C not working?

Tiny
KAREN BRENNAN
  • MEMBER
  • 2013 CHRYSLER TOWN AND COUNTRY
  • AUTOMATIC
  • 100,000 MILES
A/C blowing warm air when added Freon heard hissing from passenger rear and was leaking out. What is needed to repair?
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Friday, June 7th, 2019 AT 4:58 PM

36 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,922 POSTS
Welcome to 2CarPros.

It could be a few different things. O-rings can leak, a loose connection, or one of the lines. What I need you to do is follow the directions in this link. It explains how to find a leak.

https://www.2carpros.com/articles/air-conditioner-leak-detection

this guide can help as well

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

This video can help as well

https://youtu.be/4UjfQKvrB6Y

Please run down these guides and report back.
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Friday, June 7th, 2019 AT 9:52 PM
Tiny
DELAHOYAELI
  • MEMBER
  • 1 POST
  • 2010 CHRYSLER TOWN AND COUNTRY
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
Clutch not engaging

Things I have done
1. Checked fuses
2. Recovered system charge and recharged 2.53 lbs
3. Replaced pressure switch
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Friday, September 11th, 2020 AT 3:42 PM (Merged)
Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
Could be many things, first you must see if you are getting power and ground to the compressor while turned on. Unplug the connection at the compressor turn the key and the air conditioner on and make sure you have power and ground that's where to start. If you have power and ground then its a bad clutch, if not you probably have to take it to a shop to have many other things to checked.
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Friday, September 11th, 2020 AT 3:42 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
You might want to use a scan tool to look at the data for the air conditioner pressure switch to see if it looks correct. It has a 3 wire switch that delivers a specific pressure to the PCM and the system will shut down if that pressure is too high or too low.
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Friday, September 11th, 2020 AT 3:42 PM (Merged)
Tiny
TCDEAL
  • MEMBER
  • 3 POSTS
  • 2009 CHRYSLER TOWN AND COUNTRY
  • AUTOMATIC
  • 109,000 MILES
About a month ago, my battery had drained out. So I went to replace it. While replacing it I accidentally touched the wrong battery terminals (positive to negative) (negative to positive). I then realized my mistake and properly connected the battery. After reconnecting the battery, I noticed my radio was off and my A/C was blowing warm air. So I took it to my mechanic and he realized that I had blown the fuse for the radio but all others were fine, and he replaced it. The radio along with everything else worked fine but the A/C still wasn’t cooling right away. After starting the car again the A/C began blowing perfectly cold and was fine after that.

Later that evening I noticed that the A/C was not cooling once again and took it back to my mechanic but he was unable to solve the problem. I then went to another mechanic and got the TIPM replaced and that still did not solve the problem. But I noticed after that the A/C would blow cold air sometimes or for a minute and then go right back to warm.

I really would like to know what exactly is the problem so it can finally be solved.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
Hi Tcdeal,

Swapping the battery terminals can really mess things up, I think your lucky that was it for stuff not working. The A/C blowing cold for a short time is interesting, there's a few things to look for to figure out whats happening. Start the car put the A/C on fan on high then go out and watch the compressor. Your looking for the pulley clutch to engage. When it goes on you should here the clutch on it click and the engines rpm's to change from the load the compressor is putting on it. You might be short cycling. meaning it clicks on for a few seconds then back off again. It should click on and stay on. If its clicking on and off again every few seconds even up to 30 seconds its short cycling and something is wrong. Take a look at that and let me know if the clutch is engaging at all and how long its staying on for and we can go from there.

This guide can help as well

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.

Tom
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
TCDEAL
  • MEMBER
  • 3 POSTS
Hi 4DRTOM,

I did that but didn’t notice the pulley clutch engaging, it looked like the belt around it was moving but not the actual clutch pulley. I didn’t hear any clicks either.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
Hello,

Okay, with the clutch not engaging that our issue. First off we need to check all the fuses there is also a sensor and a relay involved involved that are common failures. Here is the wire diagram below. Do you have a test light?
Tom
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
So you will want to check for power the dark blue with yellow wire to be 12v and the other will be ground. Verify its ground is good. If you open the fuse relay box and if you can be out at it and have someone turn on the A/C, a small click should be heard from one of the relays in there, touch them to figure out which one you will be able to feel it. If It clicks the switch is sending signal and it's good if the wire leading to the clutch doesn't get hot its the relay that's bad most likely. If on the dash the A/C light is going on then fuse is good and the system is on.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
Here is a full description in the system operation and your plug terminal connection information:

Tom

A/C CLUTCH

The A/C compressor clutch components provide the means to engage and disengage the A/C compressor from the engine accessory drive belt. When the electromagnetic A/C clutch field coil is energized, it magnetically draws the clutch plate into contact with the clutch pulley and drives the compressor shaft. When the coil is not energized, the pulley freewheels on the clutch hub bearing, which is part of the pulley assembly.

A/C compressor clutch engagement is controlled by the Powertrain Control Module (PCM) or the Engine Control Module (ECM), depending on engine application. When the A/C-heater control is set to any A/C position, it sends a request signal on the CAN-IHS bus to the Totally Integrated Power Module (TIPM), which then transfers the request on the CAN-C Bus to the PCM/ECM, which determines if operating conditions are correct for A/C clutch engagement. When all operating conditions have been met, the PCM/ECM sends a signal on a dedicated hard-wired circuit back to the TIPM to energize the internal A/C clutch high side driver. When energized, the A/C clutch high side driver provides battery current to the A/C clutch coil.

The A/C clutch control system is diagnosed using a scan tool See: A L L Diagnostic Trouble Codes ( DTC ) > Testing and Inspection.

The A/C compressor clutch components cannot be repaired and must be replaced if inoperative or damaged.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
Okay, Tcdeal,
Let me know how you make out and if you need anything else or guidance on this issue.
Tom
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
TCDEAL
  • MEMBER
  • 3 POSTS
Okay, 4DRTOM.
I will try these and I will let you know, thanks.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
Okay, sounds good. We'll get this figured out.
Tom
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
CNBERRY
  • MEMBER
  • 5 POSTS
  • 2009 CHRYSLER TOWN AND COUNTRY
  • 40,000 MILES
2009 Chrysler Town & Country with 40,000 miles. Air conditioner will not blow cold air, only warm. The clutch is not engaging. Disconnected the clip which seems to go to the compressor and checked with volt meter. 11.5 volts after I turn on the key, indifferent of the AC on or not. Connector is tightly wedged between the compressor and the PS pump so I'm not completely sure if its for the AC.

Am I testing the connector for the PS pump or the AC compressor?
If PS, where is the connector for AC compressor?

I read some articles on checking the low pressure switch but they didn't give good details, only looking for corrosion. Is there a way to test it?
Also read some about direct wiring the compressor to see if the clutch will engage. Needed? How?
The connector seems to have the pins sunken inside and not sure how to get wire inside without touching the wires together except for splicing the wire on the back side of the connector. Any recommendations?

I've checked a few things but any help to understand what am I missing as to why the clutch may not be engaging would be very appreciated.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
The compressor may not be coming on because the a/c system is low on charge or there is a problem with the a/c running pressure or a bad a/c clutch/compressor.

Lets start with this guide and see what happens

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

This will tell us if the problem is electrical or refrigerant related.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
CNBERRY
  • MEMBER
  • 5 POSTS
I will check that but are these the wires? There are two wires. One black and the other is Blue and yellow?
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Yes those are the wires going to the compressor clutch
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
CNBERRY
  • MEMBER
  • 5 POSTS
I connected my gauge to the low pressure and got nothing a few days ago but I was under the impression that it wouldn't measure right unless the compressor was running. I can check it again if this is not true but I don't have the gauges needed for the high pressure side. Is checking both important at this point?
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
If the low side reads 0psi with it running or not there is no need to check the high side right now. Thats why the compressor is not comming on atleast one of the reasons. Sounds like you have no charge in your a/c system.
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Friday, September 11th, 2020 AT 3:43 PM (Merged)
Tiny
CNBERRY
  • MEMBER
  • 5 POSTS
I have checked it again and put some in it. The clutch seems to be engaging now. Do I continue to fill it up while the car is running or do I fill it up with the car turned off?
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Friday, September 11th, 2020 AT 3:43 PM (Merged)

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