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post #1 of 10 Old 08-19-2012, 04:56 AM Thread Starter
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A/C problem

Yesterday while towing a Durango my Ac started blowing really warm air. I figure with the trailer it weighed about 6,000lbs so I put on my unlimited tow from Matt, thought SRL would be pretty hot tune to pull that much. The ambient temp was about 80 the whole time. My coolant temp was about 196-198 and my oil temp was around 200-204. It was about a 1 and a half hour trip and it worked for the first 15 minutes. After dropping the Durango off and driving the 1 and a half hour back it worked the whole time. Even turned it down as it was pretty cold inside the cab. Ive never had any problems with the Ac and I'm kinda stumped. Did the tow tune make the fan clutch do more and affect the Ac clutch? Really don't have any ideas but I'm about to go on an 8hr trip with 6 ppl in my truck and need the Ac to work. Thanks for any ideas.


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post #2 of 10 Old 08-20-2012, 03:30 PM Thread Starter
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post #3 of 10 Old 08-20-2012, 06:45 PM
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I've had the same problem with my 05 all summer. Seems like if I shut the air off for a minute then turn it back on it starts working. No clue why. I am running Matt's srl+.

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post #4 of 10 Old 08-20-2012, 07:47 PM
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Originally Posted by EDGED View Post
I've had the same problem with my 05 all summer. Seems like if I shut the air off for a minute then turn it back on it starts working. No clue why. I am running Matt's srl+.
Does it blow really cold for a while then stop? If thats the case your AC is not charged correctly (I believe its undercharged).

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post #5 of 10 Old 08-20-2012, 07:59 PM
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Originally Posted by FordGuy100 View Post
Does it blow really cold for a while then stop? If thats the case your AC is not charged correctly (I believe its undercharged).
Yep, air is very cold when it's running, then just quits working.

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post #6 of 10 Old 08-20-2012, 08:36 PM
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Sounds like the condensor freezes up. I would go to a shop (unless you have AC manifold gauges) and see what they say. I believe your undercharged.

-Justin-
1985 Ford F-250 with a 6.9 IDI/T-19 4speed 4x4
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post #7 of 10 Old 08-21-2012, 03:29 AM Thread Starter
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Thanks all.


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post #8 of 10 Old 08-21-2012, 10:08 AM
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Originally Posted by FordGuy100 View Post
Sounds like the condensor freezes up. I would go to a shop (unless you have AC manifold gauges) and see what they say. I believe your undercharged.
I'll get it checked. Thanks.

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post #9 of 10 Old 09-03-2012, 01:48 PM
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99 doing it too

My 99 is doing the same thing. I've found that if I stand on the throttle the AC starts to work again. i don't think it's freezing up the condenser because it comes and goes very frequently. Please let me know what you find. btw... i have manifold gauges and the system is charge to spec.
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post #10 of 10 Old 09-03-2012, 05:53 PM Thread Starter
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Well in the last week I drove my truck about 22 hours. The Ac was on for at least 20 hours and it worked great the whole time. Guess if it's not broke don't fix it. Still don't know what caused it the first time. When it happened my windshield fogged up really bad at the same time, not sure what that meant if that's a clue to anyone.


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