Engine Size: 350
Refrigerant Type: r134a
Ambient Temp: 85
Pressure Low: 32
Pressure High: 175
Country of Origin: United States
Truck cools real good. It has vent temps at 40-37 degrees going down the road. I have the cycling switch adjusted to 25psi. I have tried 2 other switches. But going down the road the compressor cuts on and off quite a bit. At idle it doesn't cycle. The compressor is a NEW r4 compressor fitted for 134a. As I could remember the other R4 compressor never cycled- ran all the time. Maybe I am overly worried???
May be slightly low on charge. Measure the inoput and output of the evap. Output should be slightly colder than input. Open windows and doors. Run engine at 1500 for 10 minutes. See if it cycles and at what pressures. You may be only a few oz low.
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