2011 AC cold only on one side/ now both blow hot - JeepForum.com
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post #1 of 8 Old 07-28-2021, 05:45 PM Thread Starter
steve_wwk2
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2011 AC cold only on one side/ now both blow hot

This afternoon the driver side vents were blowing outside temp air and passenger side was blowing cold. Now this evening both sides are blowing hot air.


2011 Grand Cherokee Laredo, 3.6L
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post #2 of 8 Old 07-28-2021, 07:18 PM
ColdCase
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One side hot the other cold is an actuator gear, both, either the doors ar glues shut or you have two actuator gears broken. I think there is a blend door thread indexed in the maintenance/repair sticky thread.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #3 of 8 Old 07-30-2021, 09:02 AM
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I had a similar experience on my 2015 - driver's side was blowing warm to hot air, passenger side was cool (but not cold), accompanied by an almost constant hissing sound from behind the dash. I replaced the blend door actuator and gears on driver's side (gears looked good, but I replaced them anyway). Although this seemed to make it better, on hot days it still wouldn't blow anything but warm on both sides. I took it in, and the diagnosis was low on refrigerant. They found a leak in the condenser, and a possible leak in the evaporator (they said they saw dye in the condensate drain tube). I elected to only replace the condenser for now. System is recharged, cools well, and no hissing. We'll see how bad the evaporator leak is.

Not sure if this is the same as your issue, but thought I'd share in case it helps. Replacing the driver's side blend door actuator/gears is a bear, at least on the 2015.
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post #4 of 8 Old 07-30-2021, 11:37 AM
JackB1
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Out of curiosity are any of the leak preventers able to stop the evaporator leak or is there some issue in using them?
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post #5 of 8 Old 07-30-2021, 12:08 PM
GPSBob
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I thought about the 'stop-leak" type of additives. I'm always concerned that they might mess something up, like plugging the orifice tube. But at the price of replacing the evaporator ($2k+), I might consider it. Or, just add refrigerant every year.
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post #6 of 8 Old 07-30-2021, 12:08 PM Thread Starter
steve_wwk2
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Quote:
Originally Posted by ColdCase View Post
One side hot the other cold is an actuator gear, both, either the doors ar glues shut or you have two actuator gears broken. I think there is a blend door thread indexed in the maintenance/repair sticky thread.
Replaced the gear and actuator on both sides, fixed the problem right up. Pressures an all on refrigerant were good.
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2011 Grand Cherokee Laredo, 3.6L
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post #7 of 8 Old 07-30-2021, 04:41 PM
ColdCase
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Thanks for the followup.

I just got lost in thought. It was unfamiliar territory;
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #8 of 8 Old 07-30-2021, 05:02 PM
diverscale
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Quote:
Originally Posted by GPSBob View Post
I thought about the 'stop-leak" type of additives. I'm always concerned that they might mess something up, like plugging the orifice tube. But at the price of replacing the evaporator ($2k+), I might consider it. Or, just add refrigerant every year.
First, how long since your fix and recharge? Would be possible but unlikely to have two major leaks develop at the same time.

If it's been 2-3 months, you might be ok with just the condensor. And do not use anti-leak, That won't fix your problem,
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