Re: can someone explain A/C gauges

Posted by T_Bone on June 27, 2005 at 04:18:25 from (4.240.42.181):

In Reply to: Re: can someone explain A/C gauges posted by Can't even use my name on June 26, 2005 at 19:48:10:

Hi Ceumn,

WE can't....lol (pun intended) :)

Auto refrigeration is one of the most hardest systems to balance. Here you have a system with varible condsensor air flow & compressor pump flow then add a few different schemes to meter the refrigerant into the evaporator. Wow I could write for days trying to cover all the different systems that are just on auto's.

Probably the best advice I can give, would be to pull a good vacuum on the system, then refill with the mfg suggested refrigerant charge weight. This will be the correct charge in 90% of the systems.

Yes, with gauges attached I can tweek the system to yield another 5% to 10% but that would take alot of typing here just to explain one system.

Remember, refrigerant doesn't get used up, it only leaks out so it a system that needs refrigerant has a leak somewhere.

Even GM can't grasp that simple concept. My new car has a leak that GM refused to fix. One tech got close as it only leaks 12oz every two years but left the system undercharged by 24oz. After talking with a GM engineer I found that I was talking to a dead wall as this GM engineer thinks with ambient at 95� the condsensor liquid temperature should also be 95�. Well I asked, how then can the refrigerant return to a liquid state? No answer. They even wrote that on my paper work...lol

I just gave up and fixed the system my self.

T_Bone

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