The A/C works pretty good in my 89 Ranger and I can't complain too much. It will achieve 36 at the vent on high after running for about 30-45 minutes depending on outside temps. Living in Texas and "Loving the Summer Heat", I couldn't help but wonder though how much efficiency I was loosing to under hood temps, especially with the box right next to the passengers head and exhaust manifold. So began my googling and examining of the situation. My conclusion was to apply foil wrapped insulation to the box, I ended up doing the whole low side of the system to the head of the compressor.
My setup is a swapped 4.0 with a FS10 Compressor, 4.0 Condenser, Explorer blower motor, Adjustable low side pressure switch, and a very clean evaporator. System is charged with R-134a, The condenser and lines came from a 134a equipped ranger, Compressor and accumulator are new with the swap.
End result on an 85 degree day with Fan on High and vent in the MAX A/C position.
Before insulation: 15 Minutes of Driving, 40 Degrees.
After insulation: 4 Minutes of Driving, 35 Degrees with compressor cycling due to Low Side switch adjustment.
My setup is a swapped 4.0 with a FS10 Compressor, 4.0 Condenser, Explorer blower motor, Adjustable low side pressure switch, and a very clean evaporator. System is charged with R-134a, The condenser and lines came from a 134a equipped ranger, Compressor and accumulator are new with the swap.
End result on an 85 degree day with Fan on High and vent in the MAX A/C position.
Before insulation: 15 Minutes of Driving, 40 Degrees.
After insulation: 4 Minutes of Driving, 35 Degrees with compressor cycling due to Low Side switch adjustment.



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