AC Compressor Bypass
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 29
From: San Rafael CA
Why would you want to force it .... the PCM (it controls the compressor clutch) is programmed to "protect" the compressor if the refrigerant pressure is too low or too high (OK range between 30 psi and 410 psi). The refrigerant has a lubricating oil that lubricates the compressor. If you have no refrigerant then you have no oil.
Power for the clutch is provided by the Underhood Fuse Block (Fuse 24) and then the A/C Clutch relay (Relay 34) also located in the UH Fuse Block. Power flows from the relay to the Clutch diode via a DARK GREEN wire, and the Ground is the BLACK wire from the diode to Splice Pack 100, which is attached to G102 ground point.
See the ELECTRICAL STICKY at the top of this forum for more info on grounds and splice packs.
Power for the clutch is provided by the Underhood Fuse Block (Fuse 24) and then the A/C Clutch relay (Relay 34) also located in the UH Fuse Block. Power flows from the relay to the Clutch diode via a DARK GREEN wire, and the Ground is the BLACK wire from the diode to Splice Pack 100, which is attached to G102 ground point.
See the ELECTRICAL STICKY at the top of this forum for more info on grounds and splice packs.
Pro
Joined: Jun 2007
Posts: 631
Likes: 3
From: Joppa AL
Why would you want to force it .... the PCM (it controls the compressor clutch) is programmed to "protect" the compressor if the refrigerant pressure is too low or too high (OK range between 30 psi and 410 psi). The refrigerant has a lubricating oil that lubricates the compressor. If you have no refrigerant then you have no oil.
Can you give us some more info?
Thread Starter
Racer
Joined: Nov 2006
Posts: 264
Likes: 8
From: Centre, AL
Well..a few weeks ago I had to recharge my system. Slow leak (years slow). There was enough pressure in the system to start the AC compressor. However in case this happens again and there is not enough pressure, the AC will not start (actually seems fine now), and then you need to manually start the pump to suck in R134. If the pump is not running, wont be able to fill the system. So basically my question was to prepair for if I needed to do that.
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MFIC
Joined: Aug 2005
Posts: 1,997
Likes: 8
From: Charlotte, North Carolina
As soon as you open the valves on the R134 bottle the pressure will go up high enough for it to start on its on.
Don't force it
, I would at least buy a can of 2oz of PAG to add also. If you're leaking gas you are also leaking oil.
Don't force it
, I would at least buy a can of 2oz of PAG to add also. If you're leaking gas you are also leaking oil.Well..a few weeks ago I had to recharge my system. Slow leak (years slow). There was enough pressure in the system to start the AC compressor. However in case this happens again and there is not enough pressure, the AC will not start (actually seems fine now), and then you need to manually start the pump to suck in R134. If the pump is not running, wont be able to fill the system. So basically my question was to prepair for if I needed to do that.
Intermediate
Joined: Dec 2004
Posts: 47
Likes: 0
From: Abingdon Illinois
St. Jude Donor '07
I had the same problem. After opening valve on just a 12 oz. can, I waited several minutes and finally the compressor kicked on. It seemed like it took a long time to empty a 12oz can of refrigerant. I then added a 2oz can of lubricant and then another 12oz can of refrigerant. A/C has been working good for weeks.
Good Luck
Good Luck
