Engine Size: 350
Refrigerant Type: r-12
Ambient Temp: 99
Country of Origin: United States
I don't have a evac machine. I do have gauges and a old helium party tank.
Anybody evac a system with the ac compressor, engine running? how is it done? can I do it with the equipment I have?
I need to replace the high side valve.
Thanks in advance.
If the concern is moisture in the air, I have a cheap vacuum generator, but not a vacuum pump. So once I transfer it to the tank I can pull a vacuum. Shop wants more than a new pump. +I have to pay to get my r12 back .
Just make sure that both your hi and low side gauge's are showing ~30in/Hg and leave it on for at least 30 minutes. Let it sit for a while to make sure it holds vacuum and recharge with new virgin R12. DO NOT put back in the stuff you sucked into the helium tank. I can almost guarantee it is going to have air mixed in with it and then you have defeated the purpose of even pulling a vacuum.
People have made up their own setups in the past some have worked some have failed. My suggestion is to get a vacuum pump and do the job correctly.
Mastercool 3 CFM Pump
You need a vacuum pump for any service that involves opening the system. Cheap vacuum generators are not suitable, they will leave air behind which will impair performance.
There are ways to recover refrigerant into a tank without a recovery machine. You must fully evacuate the tank first (again no cheap vacuum generator) or the refrigerant will have air in it. Then make the tank very cold with a chest freezer and wait several hours with the tank connected to the car for the refrigerant to condense in the tank. You will need to buy some R-12 to top up. Besides leaving some behind in the car, there's also no way to get all the refrigerant out of the tank to reuse it.
Trying to use the compressor to pump all or most of the refrigerant out risks compressor damage. They're not made to run dry. You probably have an R-4, which tend to seize up just from someone looking at them funny.
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