Quote:
Originally Posted by chevyguyase
If you are charging your A/C by weight the ambient temperature won't matter. It will affect the pressure reading on your gauges. Lower temps usually equal lower pressures. There are Ambient/pressure charts on line for your pressures. Use a chart for TX valve and r134a, both will affect your pressures. You mentioned ". "The Hayden relay for the electric cooling fan has its wire spliced into the wire coming from the binary switch to the compressor. When the compressor gets power, it signals the cooling fan to run". I would like it if you were to move the splice to the other wire on your binary switch. This would turn your fan on when A/C is requested and not just when the compressor is running. Did the bad fuse holder supply all of the power to your A/C or just the evap fan? I'm wondering if the fuse was your only problem to begin with?
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I am recharging by weight, so that way I can stay in the temp controlled shop instead of outside in the Texas heat. Because the binary switch is always on, except when the pressure is too high or two low, the electric fan powers on as soon as the AC system is turned on. When the AC system is powered off, the Hayden relays temperature probe inserted in the upper part of the radiator determines if the fan should run. Over 180 degrees, it runs. Under 180 degrees it shuts off.
The fused line powers the fan for sure and during my testing, when it is powered on, the third wire to the binary switch is energized, so assuming there is no low pressure or high pressure issue, then the binary switch sends the 12 volt power to the compressor to engage the clutch.