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Charging not going well


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higgins
New User

Aug 12, 2017, 4:20 AM

Post #1 of 7 (496 views)
Charging not going well Sign In

I've been working on GrandPa's 1992 Buick PA R12 AC system for over 2 months now - I have studied the charging procedure over and over - every single piece of AC hardware is new - system held great vacuum . Did all my pre-checks....Today was the big day to finally charge and then ...flop..

With the car off, I charged one 12oz. R12 can as a liquid on the High side (HR6 Compressor) - no problem there. Turned off the high side valve and then connected 2nd can to the Low. Turned the car on - Compressor started cycling. Low and High side pressures going up and down pretty quickly as the compressor cycles. As soon as I open the Low side valve for the 2nd R12 can to flow in , its stops cycling and then both pressures climb/equalize at 110psi - its about a 100deg. here in Dallas. ..Even though I put the 2nd can in hot water - upright- seems like no more gas is flowing , compressor is doing nothing and gauges are equalized at 110...I tried to jump the Low Pressure Cutoff switch just to see if the clutch would engage - but nothing happened.
I let the car cool down and then started it up again wit the AC on. The compressor started cycling and since my R12 can was still connected I opened the valve to try to charge more. As soon as I open the Low side valve the compressor stopped cycling and the Low Pressure went to 110psi - same for High side.
Any help would be highly appreciated.


Hammer Time
Ultimate Carjunky / Moderator
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Aug 12, 2017, 4:36 AM

Post #2 of 7 (492 views)
Re: Charging not going well Sign In

You're not clear on one thing. Is the compressor disengaging when this happens?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Aug 12, 2017, 5:22 AM

Post #3 of 7 (481 views)
Re: Charging not going well Sign In

If it cycles too many times in a certain period of time the ecm will disable the compressor and set code 66. You should be changing this by using a refrigerant scale instead.





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Hammer Time
Ultimate Carjunky / Moderator
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Aug 12, 2017, 7:02 AM

Post #4 of 7 (472 views)
Re: Charging not going well Sign In


Quote
If it cycles too many times in a certain period of time the ecm will disable the compressor and set code 66. You should be changing this by using a refrigerant scale instead.


Only if you are assuming this is a ATC system. They did come with manual systems also.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



higgins
New User

Aug 12, 2017, 9:22 AM

Post #5 of 7 (454 views)
Re: Charging not going well Sign In

I found that my Low side coupler wasn't making good contact with the Schrader valve...all is good and sorry for the trouble.Blush


Sidom
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Sidom profile image

Aug 12, 2017, 10:42 AM

Post #6 of 7 (449 views)
Re: Charging not going well Sign In


In Reply To
my Low side coupler wasn't making good contact with the Schrader valve


That sounds like a R134 set up, which would be good....

When you said R12... I was wondering why you wouldn't convert it to R134 and where you found R12 and was able to get it without a license....

But sounds like all is good






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Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 12, 2017, 11:02 AM

Post #7 of 7 (444 views)
Re: Charging not going well Sign In

?In Reply To
my Low side coupler wasn't making good contact with the Schrader valve




Hope you are either using REAL R-12 not "Freeze 12" with that problem. That's a common problem with retrofit adaptors you can adjust or have to not generally OE R-12 Shraders.


Note that Freeze-12 isn't one molecule of real R-12 at all, worse it's a whole different procedure to work with,


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