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Old 06-17-2015, 11:51 PM   #1
Lon
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Air conditioning while towing

I've noticed my airconditioner seems to work less efficiently when I'm towing my mini lite tt uphill on a hot day. Is this a normal expected decreased function under these conditions or should I get it checked out. The unit works perfectly when the engine is not under extreme load.

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Old 06-18-2015, 12:00 AM   #2
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prolly something to expect....how are the truck temps? you have 2 maybe 3 radiators back of your grill coolant tranny and ac. going uphill especially on a long incline in a lower powered truck on a hot day...my guess.
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Old 06-18-2015, 01:56 AM   #3
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You didn't give any manufacturer info, so I assume it's the Chevrolet in the picture? If so, yes, that's normal operation. When the engine computer sees certain parameters under load it turns off the AC compressor to free up some power, and that happens before you're on the floor.
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Old 06-18-2015, 06:44 AM   #4
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most any vehicle will turn the ac compressor off when you reach a certain point in the throttle or high RPMs. Nothing wrong at all.
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Old 06-18-2015, 01:25 PM   #5
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Thanks. U saved me a big mechanic bill!
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Old 06-18-2015, 01:27 PM   #6
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I agree "all normal"

Course a duramax a/c never shuts off with all that hp and torque available.
Ops did I say that?

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Old 06-18-2015, 05:05 PM   #7
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Quote:
Originally Posted by TURBS View Post
I agree "all normal"

Course a duramax a/c never shuts off with all that hp and torque available.
Ops did I say that?

TURBS
08 duramax tuned n modded
2011 32bhok Sabre
2015 camping "9 nights"
And you're likely right, because with the available power on tap you probably don't hit that mark very often for very long.

It varies by model and engine combo, but 85% power demand is kinda the mark where the compressor turns off. Note, power demand, not throttle position. It's an algorithm that takes into account throttle position, vehicle speed, engine speed, transmission gear along with other parameters.

So if you never need to hammer it, it'll never turn off.
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Old 06-18-2015, 05:44 PM   #8
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Uh oh. I've had some problems with my throttle position sensor. Ur post reminded me. I'll bet that intermittent TPS problem is playing a role in this.
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Old 06-19-2015, 08:56 AM   #9
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A/C running warm

Quote:
Originally Posted by Lon View Post
I've noticed my airconditioner seems to work less efficiently when I'm towing my mini lite tt uphill on a hot day. Is this a normal expected decreased function under these conditions or should I get it checked out. The unit works perfectly when the engine is not under extreme load.
Attachment 80329
In most if not all cars/ tricks built today have a switch or preset in computer when in heavy throttle/ full throttle the a/c shuts down, it is presumed you need the power and it aids in cooling under heavy load conditions.

So your answer is YES this is normal
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Old 06-19-2015, 09:00 AM   #10
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Quote:
Originally Posted by TURBS View Post
I agree "all normal"

Course a duramax a/c never shuts off with all that hp and torque available.
Ops did I say that?

TURBS
08 duramax tuned n modded
2011 32bhok Sabre
2015 camping "9 nights"
Same with Super Duty!! It just gets colder!
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