GTM stage 2 Air Conditioner Problem?

jm1fd

I don't have experience with R-134a systems in ambient temperatures that hot, but I do have experience with R-134a systems in general. It wouldn't surprise me a bit to see high side pressures of 300-350 in 130 degree ambient temperatures. Low side under those conditions would probably be in the neighborhood of 40-50.

A/C getting hot in stop and go traffic sounds like it is cutting the compressor because the high side pressure is too high. If it is only in stop and go traffic, then you have insufficient airflow through your condenser, or the air you're getting into your condenser is too hot.

I assume you have one or more intercoolers in front of the condenser? Where are your air filters located? Are they pulling in cool air or hot air from the engine bay? If they're getting hot air from the engine bay, the intercooler(s) are dumping that excess heat straight into the front of the condenser, and that is suboptimal to say the least.