Is towing breaking my TV A/C?

"debris everywhere". Most likely a shattered bearing. I'm surprised you didn't hear any noise in the time before it went. Usually bad bearings are very noisy.

Fixed under warranty the first time, but did they use a new or rebuilt compressor? Rebuilts are known for failing after a few years.

No correlation between towing and killing the A/C. More likely fault would be poorly designed A/C system, bent pulley, too tight belt, junk in system...

I've had 4 tow vehicles during the past 30 years. My first 3 were over capacity, one was 5000lb over capacity. In all those years, I only had one A/C hose develop a leak. No major failures.

I can't fathom that towing would have anything to do with AC.

I also can't fathom that a Toyota has had 2 bad AC systems in 5 years. I've driven high-mileage Toyotas for 20 years and never had an AC problem.

In your shoes I would look for a different service shop.

Yes, the compressor sent debris everywhere I'm told. I do have gauges for engine and transmission temperature. I did not get any high temperature warning though obviously I wasn't paying attention all the time.

I will get a second opinion later this week. They told me something was bad with the compressor itself even when it was new. I just think it's funny it's the second time it happened in 5 years. Granted, I don't know if it was the same problem the first time.

vspeed wrote:
So I have been towing since 2010 with my Sequoia (2010). I have a 6000lbs Jayco. In 2012 my car A/C broke and they had to change the compressor and other things. It would have been expensive but it was under warranty. It broke again this weekend but they say just told me they will have to change everything not just the compressor. Estimated cost is now at 3700.

Could this be caused because I'm towing too much or is it unrelated? The engine or transmission never overheated.

Unless you are running red-line rpms the whole time I cannot see a connection between towing and A/C failure.
What has actually failed? The only component that COULD be affected by continuous high rpms would be the compressor.
The control switches in the system will cycle the compressor on and off as needed. "On" cycles my be shorter if the compressor is running at high speed.
Unless the compressor has grenaded and there is junk throughout the system I cannot understand why they would need to change "everything":h

Do you have actual gauges showing you the motor and transmission temps? While you may not be running super high temps they may be hotter than you think. On the other hand, perhaps you need to get another opinion about your AC.