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Posted by Kyle97-clipse, Apr 5, 2010
420A Bolt-on Tech - Intake, exhaust, ignition, fuel system, cooling, etc - specific to 2G N/T DSMs. New Members must limit their 420A tech posts to this forum.
That is because you are charging the system incorrectly. You need to pull a vacuum on the system to remove the air/moisture, then the vacuum will pull in the R134a so the compressor can kick on. Even if you get some in there, the system won't function very well with air in the system and not knowing the exact amount going in either.
Dont try to jump it just yet. Go grab a couple cans. Charge the system.When You get close to the right amount your commpressor will come on.
To answer your question. No your commpressor doesn't have to be running to charge the system
Adam is right you need a vac if you replaced something in the A/C system. But it sounds like you may just be low
Make sure to put the freon in on the low side.
It is recommended to pull a vacuum though. Pull a vacuum and let it run for 30 minutes. close off the system and if it holds the vacuum then there are no leaks.
I use Compressed Nitrogen at the shop to pressurize the system and then spray everything down with soapy water.
You only need to pull a vacuum if you have to replace something in the system.
I would disconnect the pressure switch and jump across the terminals to see if the compressor will run. If the compressor runs then try adding freon. If adding freon does not let the compressor run then the pressure switch is probably bad.
If the compressor fails to run by jumping the terminals then you need to start checking things like the clutch air gap and what not. At that point it may be best for you to take it to someone qualified to work on A/C stuff.
yellow, is the condenser on, working but not using freon,
green is with the freon circulating (cools the cabin faster) yellow is just more like a cool fan.
WOW I NEVER NEW THIS THANKS FOR THE INFO.
The a/c compressor is not kicking on. Whether the green or yellow a/c light is on, the signal doesn't appear to be making it to the relay. I can apply voltage to the relay and the a/c clutch will engage and the compressor will work and the very nice cold air will flow. I just charged the system, so it isn't low refrigerant that is keeping the compressor off.
Does anyone have any other suggestions of things to check to figure out this issue? It is looking more and more like an electrical problem.
You could also have too much refrigerant in the system. The dual pressure switch also switches off above a certain pressure (~370-455psi).
Alternatively, the dual pressure or refrigerant temperature switches may be faulty.
In any case, you should really start a new thread for your problem outside of the 420A Bolt-on Tech forum.