Jumping the A/C Compressor
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Joined: Jun 2004
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From: Amarillo, TEXAS!
First, why is it empty, for how long has it been empty, and was it open to the atmosphere in the meantime? Evacuating is done to remove old refrigerant, and moisture from the system. It can also serve as an indication as to whether you will be wasting your money dumping refrigerant into a system with a leak.
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Originally Posted by Pikachu
First, why is it empty, for how long has it been empty, and was it open to the atmosphere in the meantime? Evacuating is done to remove old refrigerant, and moisture from the system. It can also serve as an indication as to whether you will be wasting your money dumping refrigerant into a system with a leak.
Bad pressure switch? WOT?
This is getting to be a pain.
J.
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From: Amarillo, TEXAS!
OK, I didn't make the mental connection. When you say 55 psi, is that with the engine running, fan on high and the A/C on max?
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Sorry.
Yes. Then engine running, compressor on and at "max air" on high at the coldest setting.
The pressure on the low side is 50.
I had to jump the pressure switch to get it to engage though.
I know It shouldn't be jumped for long periods as not to burn out the compressor, but if it is fully charged, is that a problem?
And being that it is only a pressure switch, when it's jumped, will the system still shut down if I turn it off from inside the truck?
J.
Yes. Then engine running, compressor on and at "max air" on high at the coldest setting.
The pressure on the low side is 50.
I had to jump the pressure switch to get it to engage though.
I know It shouldn't be jumped for long periods as not to burn out the compressor, but if it is fully charged, is that a problem?
And being that it is only a pressure switch, when it's jumped, will the system still shut down if I turn it off from inside the truck?
J.
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Lead Driver
Joined: Jun 2004
Posts: 6,361
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From: Amarillo, TEXAS!
50 is actually a little high, unless the ambient temperature is very high. 35-40 would be better. Three things come to mind: bad pressure switch, over charged, or airflow restricted. I'd lean toward the pressure switch if you have to jumper it to even get the compressor to run at all, but you should check high side pressure also.
To answer, yes the system should still shut off at the switch even with the pressure switch jumpered.
To answer, yes the system should still shut off at the switch even with the pressure switch jumpered.
Lead Driver
Joined: Jun 2004
Posts: 6,361
Likes: 593
From: Amarillo, TEXAS!
An overcharge, especially if there is also a restriction in the system can cycle the compressor off via the high pressure safety switch. High side generally should be under 225-250 or so. Mine runs about 200 on the high side and 36 on the low side at 92 degrees outside. The vent temp comes down to 38 F on max.