GM r4 pancake to sanden conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

weq92f · 09-09-2023, 03:28 PM

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Finished up the final tuning of the AC today...Using specs from Vintage Air, I was able to achieve 42 degrees F at the vent while seeing 18psi low and 250psi high...this at just over idle sitting still...it will get better at cruise speed. This at 98 degrees ambient.

The total charge was right around 1.8 lbs or 2 12oz cans of 134a w/no additives.

I also placed an electric pusher fan on the new parallel flow condenser which I'm sure helps those standing still pressures quite a bit.

I'm totally thrilled with this conversion and the final results. Time will tell how much more reliable this unit is over the old factory stuff.

-klb

09-09-2023, 03:28 PM	#12
weq92f Registered User Join Date: Oct 2016 Location: Dallas Texas Posts: 3,850	Re: GM r4 pancake to sanden conversion . Finished up the final tuning of the AC today...Using specs from Vintage Air, I was able to achieve 42 degrees F at the vent while seeing 18psi low and 250psi high...this at just over idle sitting still...it will get better at cruise speed. This at 98 degrees ambient. The total charge was right around 1.8 lbs or 2 12oz cans of 134a w/no additives. I also placed an electric pusher fan on the new parallel flow condenser which I'm sure helps those standing still pressures quite a bit. I'm totally thrilled with this conversion and the final results. Time will tell how much more reliable this unit is over the old factory stuff. -klb Attached Images __________________ 67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold Last edited by weq92f; 09-09-2023 at 06:00 PM.



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