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saturn recharge

paulbol on Tue June 09, 2009 1:26 PM User is offline

a few questions, thanks for the help in advance;

saturn 2002 l200...i bought from mc a gage set and 3 cfm vac pump. we hooked it up to the saturn and had 29 hg vac in less than a minute, closed the valves and the vac has held for 30 minutes. do i need to run the vac pump for 30 minutes with the valves open to boil the moisture out or just have a vacuum in the system.

i have small cans of r134a, and know i need 33.5 oz. what will i need to get to hook to the cans? should the cans be put in warm water? how many cans will go in with the vacuum in the system without starting the engine? where and how is the pressure cut off valve and how is it bypassed? is it ok to leave a vacuum in the system for a week while i order whatever is needed for the cans. thanks in advance Paul

HVargas on Tue June 09, 2009 2:03 PM User is offlineView users profile

You need to pull a vacuum for at least 30 minutes to boil out the moisture that is correct. Do this with the valves open and pump running. You can put the cans in warm water to help them build pressure and go into the system quicker. As far as how much will go in before you have to start the car is really a toss up. You can leave the system in a vacuum as long as you want. I doubt it will hold for a week but you can just pull it back into a vacuum when you get everything you need. Your gauge set should have a yellow hose with it to charge the system though. Do you have a picture or part number for the MC gauge set you have?


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mk378 on Tue June 09, 2009 2:04 PM User is offline

Always pull vacuum again for at least 10 or 15 minutes just before charging. If you disconnect the gauge hoses, air is likely to get in because the shrader valves aren't designed to hold vacuum.

You should be able to find a standard can tapper at local parts stores. It screws onto the top of the can and pierces the top. The side outlet has 1/2" acme threads for your yellow hose.

Chick on Tue June 09, 2009 8:37 PM User is offlineView users profile

Less than a minute, I would make sure you did pull a vacuum on the system, and not just the hoses.. If you have any problem with the refrigerant flowing in, you may not be depressing the shrader valves..

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paulbol on Wed June 10, 2009 1:15 PM User is offline

interesting, so how do i check to see if the shrader valve is opening? this is a new gage set from mastercool part # 66773, could the adaptors be bad? tried it again and again had 29 hg in less than a minute

thanks for the interesting input


mk378 on Wed June 10, 2009 1:25 PM User is offline

Hook up with the car up to air (zero psi, not vacuum). Keep both manifold valves closed. Turn on the vacuum pump then open only one manifold valve (high side is probably best). Both gauges should drop into vacuum as the car is evacuated. If only the one does, you aren't actually connected to the car.

After this check go ahead and open both valves wide for the best possible vacuum.

paulbol on Thu June 11, 2009 12:46 PM User is offline

u are correct i am not getting a vacuum in the system, just the did i get bad fittings with the gages or am i doing something wrong. seems pretty straight forward, pull the outer ring back slip over the fitting and release. the are latched on to the fitting for sure,
thanks Paul

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