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.
Quote:
Originally Posted by hindi1973
hi guys can anyone post their expereince in hot states above 110f regarding the low side and high side ac pressure results ? i am limited at the time being for the high side pressure gauge and most shops around me only can see the low side which is approx 32 to 35 psi , but the ac still gets hot in stop go traffic . so before i take action with bigger than fans , i am doing sams advise ac 101  , i have a feeling the high side is either too high or too low , or the 32 psi low side is also too low for our 130f weather or gets too high when the compressor kicks in .
all your help is appreciated
brand new 2012 twinturbo 370z nismo , approx 40's row oil cooler ,csf radiator , distilled water with water wetter , coolent temp is either half exactly or one dot below , oil temps is usually 210 to 220 in our 130+f weather |