The AC on the Tundra doesn't blow cold enough?

TrailJustin · 2026-04-01T19:21:33+00:00

I recently picked up this trailer and have been rebuilding and improving a lot of the systems on it. Here a link to the build thread https://3gtundra.com/threads/taxa-outdoor-tiger-moth-trailer-rebuild-thread.1098/ Now let me start with, this is a light trailer under 2k loaded. But when I first pulled it, I felt the weight behind the truck and when trying to stop. I configured the trailer on the truck dash and set up that it had brakes, but I never saw them engage. After some messing around I finally found up you need to hit the + button on your dash to adjust your gain. This starts to use the brakes on the trailer. Never had a trailer with electric brakes before so it was new to me. Now let me tell you. This changes my whole outlook on the thing! I was going to buy new brake pads. Maybe swap the axel and break system to Timbren. But that is all gone now. This thing stops perfectly. On downhill trips in the Sierras, I can add more gain or even hit the brakes on the trailer myself to slow me down. Highly recommend using this feature but I would say the Autwobrake does have me curious. https://getautowbrake.com/products/autowbrake-trailer-mounted-electric-brake-control?srsltid=AfmBOooULOz8rKBZbW_vIGTcvbyufe1QLbFsmXmWxE3peQQ8TnW7WMgw

TrailJustin

Member

Yesterday at 8:13 PM

This is a repeat issue I have seen pop up on the Facebook groups time and time again especially for guys in more humid climates. So, the AC just doesn't blow that cold or strong and with the help of some guys testing we finally figured it out.

How to Fix.....
Run the system on auto. Yup that is it. Just run the system in auto mode and it blow crispy cold. I am not sure if this has to do with Toyota programing or tuning but the system blows far better and nicer when in Auto mode.

What we found.....
Its weird to say but "car guys" or just guys who use the truck like manual control of the system. Want to control the fan speed, if the AC compressor is on or off, or which vents. It the same guy who use only manual wipers or just spray a little bit of washer fluid at a time. Trying not to "abuse" the parts. But for whatever reason the AC system in this truck just doesn't like it. It wants to have its temperature reading and adjust itself. Then it freezes you off in the driver seat if you would like it.

How we found this....
I got together with 6 guys in the FB group. 3 of us ran manual and 3 of us didn't we did that for a week and then switched. Some of us instantly noticed and started switching back and forth between modes on drives and you can clearly tell. But all 6 of us came to the same conclusions that as much as it hurts your inside run the system on Auto.

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