Quote:
Originally Posted by rsr91128
Do you check these at idle? If so what are the hi/low numbers supposed to be at around 85 dg?
Only chart I have seen was with engine @ 2000 rpm.
TIA
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In a picture perfect world with R134a you can use the following nominal pressures (psi) at 85F:
low = 30
high = 214
These values are "nominal". You may notice them go up or down a few psi in either direction as the system operates due to various normal reasons, such as the expansion valve opens and closes, the compressor clutch cycles on or off with the thermostat. The front condenser fan turns on and off or changes its fan speed. Usually the low side is given a broader range than the high side and not noted in a Pressures and Temperatures chart but rather shown as between 20-40 psi. There various 'things' (good and bad) that affect the pressures so if you don't hit it on the head 'perfectly' then just say its not a picture perfect world.