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Re: [GMCnet] a/c compressor not engaging [message #345170 is a reply to message #345161] Fri, 12 July 2019 08:29 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma:
Senior Member
If you are using a hydrocarbon instead of the original Freon R12 you cannot use the pressure information in the maintenance manual.
You should not put in more than three 6 ounce cans or it won’t cool. You should fill to about 20 psi at 1500 rpm. Forget about static or non running pressures. If the ambient temperatures are high it will be a bit higher pressure such as 25 psi.

Emery Stora

> On Jul 11, 2019, at 11:46 PM, roy keen via Gmclist wrote:
>
> The switch I believe you are referring too is the loss of charge switch it should be located in the liquid line not the suction line. It would be best
> to have a set of gages on the system and jumper out the loss of charge switch then add refrigerant till the low pressure gage reads about 25# with the
> engine rpm around 1500. I suspect you may have a fair sized leak if the loss of charge switch is shutting off the compressor..
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
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