67 cougar a/c problem

[madmanmanick]

I feel kind of embarrassed that I have to ask this. I am having a problem with a 67 Cougar and its A/C. A friend of mine installed an new R-134a system into his vehicle and asked me to charge the system for him. I first put the system under a vacuum and it held. I then slowly charged the system with vapor to 30 psi on the suction side. The system ran fine for about 20 minutes, then the pressure jumped up and pegged out the high and low side gauges on my manifold and the relief valve lifted on the compressor and dumped the entire charge. I then put the system back under a vacuum. Again it held. I then put a can of oil charge in the system, then charged the system with vapor refrigerant to 25 psi. The system ran good for about an hour or so, then did the same thing again. The car does not have the economizer, but everything else is good to go and the system is sound. Does anyone have a suggestion on something I might have overlooked, or have missed, or can do to get the system working. Thanks in advance.

 

[Wayne M.]

Would this be a new complete system, like a classic air, or an upgrade to the original?

 

[Hoefler]

Did he install a new dryer and a expansion valve, flush the system, etc. . ??

 

[rscurtis]

If it's the original system, go back to R12. Old vehicles do not have the condensing capacity that 134 requires.

 

[Wayne M.]

If it's the original system, go back to R12. Old vehicles do not have the condensing capacity that 134 requires.

BINGO. But sometimes that's not an option.

 

[madmanmanick]

he installed a system from a new car into an old car. the system has a dehydrator and a expansion orifice.

 

[BIGNASTY]

WOW!!!!!! a 45 year old COUGAR and she has A/C problems I dont know much about A/C but if she's a good looking Cougar I have a nephew that lives in Anaheim Ca (he's single) or are you talking about the car kind of Cougar? :-laf

 

[Wayne M.]

he installed a system from a new car into an old car. the system has a dehydrator and a expansion orifice.

There is most definitely a mismatch somewhere. either the orifice, the evap/ condenser size, air flow, or all of the above. a AC expert really needs to check it out and see how everything is matched up. Get it fixed and that Cougar will take care of you... :-laf