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Unread 10-10-2013, 01:08 AM   #1
Carlo
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2001 TJ Wrangler 
 
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Location: Union City, CA
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AC Evaporator leak

I have 2001 4.0L TJ that has a refrigerant leak inside the passenger compartment. Is this a common problem? Will the leak always be coming from the evaporator and not somewhere else inside the cabin? The inlet and outlet of the evaporator extends out of the firewall into the engine compartment. This is why I am presuming there is a hole in the evaporator. From the sightglass inside the engine compartment, the color is green therefore it still has an adequate amount of the refrigerant. Is there a purge or overpressure valve in the system where it would purge the refrigerant when it reaches a certain pressure?

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Unread 10-10-2013, 01:12 AM   #2
Necko2529
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Where does it leak inside the passenger compartment? Are you sure its not antifreeze leaking out of the heater core over on the passenger side under the dash and not refrigerant?
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Unread 10-10-2013, 10:32 AM   #3
Carlo
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The TJ 4.0L is in another country therefore I cannot check it. I am simply relaying the reports given to me from a friend.

At first, I suspected it was the coolant. The coolant was checked and there and it was full. Then the coolant dye was mixed and there wasn't any visible signs inside the cabin. Then maybe it could have been the brake/clutch fluid leaking from the inside but the reservoir was full and the paint from the floorboard had no damage. Therefore the last one must be the AC refrigerant. However, I have a problem believing the evaporator has a leak. Are there any other places inside the cabin where the AC refrigerant might leak other than the evaporator.

I will be able to see my TJ in 2 months and would like the purchase the parts in the U.S. for it is cheaper.
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Unread 10-10-2013, 10:36 AM   #4
jeepwrangler97
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Quote:
Originally Posted by Carlo View Post
The TJ 4.0L is in another country therefore I cannot check it. I am simply relaying the reports given to me from a friend.

At first, I suspected it was the coolant. The coolant was checked and there and it was full. Then the coolant dye was mixed and there wasn't any visible signs inside the cabin. Then maybe it could have been the brake/clutch fluid leaking from the inside but the reservoir was full and the paint from the floorboard had no damage. Therefore the last one must be the AC refrigerant. However, I have a problem believing the evaporator has a leak. Are there any other places inside the cabin where the AC refrigerant might leak other than the evaporator.

I will be able to see my TJ in 2 months and would like the purchase the parts in the U.S. for it is cheaper.
The only place the refrigerant travels in the cabin is the evaporator. I don't think there're any other places it could come from inside the cabin.

Fwiw, mine leaked...they're a kind of a PITA to replace, you have to take out the dash, but overall not that bad of a job I guess. If you replace it, I would highly suggest replacing the heater core at the same time.

Edit: if you can afford the mopar stuff, I would go that route, some aftermarket stuff doesn't fit as well in the hvac housing

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Unread 10-10-2013, 10:38 AM   #5
Carlo
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by the way, the sight glass for the refrigerant was checked by the mechanic and it showed full.
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Unread 10-10-2013, 10:47 AM   #6
Carlo
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Quote:
Originally Posted by jeepwrangler97 View Post
The only place the refrigerant travels in the cabin is the evaporator. I don't think there're any other places it could come from inside the cabin.

Fwiw, mine leaked...they're a kind of a PITA to replace, you have to take out the dash, but overall not that bad of a job I guess. If you replace it, I would highly suggest replacing the heater core at the same time.

Edit: if you can afford the mopar stuff, I would go that route, some aftermarket stuff doesn't fit as well in the hvac housing

Sent by a messenger bird
Did you also replace the hose(s) or just the o rings???
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Unread 10-10-2013, 10:48 AM   #7
Carlo
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Originally Posted by Carlo View Post
Did you also replace the hose(s) or just the o rings???
What about the Receiver/Dryer? Isn't that inside the cabin also? Did you replace it too?
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Unread 10-10-2013, 10:53 AM   #8
jeepwrangler97
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Quote:
Originally Posted by Carlo View Post

What about the Receiver/Dryer? Isn't that inside the cabin also? Did you replace it too?
The receiver/dryer is in the engine bay. I replaced the hoses too, but I already had to replace them anyways

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