I’ve never had to jump a low switch to charge a system. Including my 4Runner after I put the engine in.

What pressure is 8 o clock.

The vacuum should have pulled enough refrigerant into the system to close the low side pressure switch and energize the clutch. The pressure will rise and fall as the compressor cycles on and off. Running a little longer each time until there is enough in the system to keep the suction pressure above 25psi or so.

Was the system empty before you started vacuuming it?

You said the high side stayed at zero? Even if the expansion valve was blocked with debris from a grenade’d compressor the pressure still should have equalized between the high and low side through the condenser.


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