Engine Size: 350
Refrigerant Type: R12 -> R134a
Ambient Temp: 80
Pressure Low: NA
Pressure High: NA
Country of Origin: United States
I am putting AC in my 1972 K10 pickup. It previously did not have AC. I purchased all the AC stuff off of a parts truck, modified the firewall to match an AC truck, purchased new, flexible hoses from a different supplier, and installed all the AC stuff.
I ordered the 1988 and prior O-ring kit (CP3011), Nylog (blue) gasket thread sealant (RT201B), two thermal limiters (29-30705), and receiver/dryer part number 37-13218 from ackits.
Today I picked up a fan belt, replaced EVERY o-ring in the system, and left the receiver/dryer for the last step. I filled it with oil, coated the o-rings with nylog and went to screw in the fittings. This is where I ran into a snag.
The smaller female o-ring fitting on 37-13218 fits one of the holes in the new receiver/dryer, the other hole is too big.
The hard lines on both sides of the receiver/dryer on the truck are the same size. Both fit the smaller of the two holes on 37-13218.
When I navigate to "1972 C & K Seriers Truck 5.7 Liter Engine" parts for sale section it lists 37-13218 which doesn't work.
Does anybody know the correct part number I need to order?
FWIW, I plumbed in the old, factory receiver/dryer and pulled a vacuum. It remained at -27 in. Hg vacuum for over an hour.
And I have adjusted the POA to work with R134a. All I need is a new receiver/dryer and I'm golden.
It's possible the parts you might have pulled off the donor vehicle were not correct for the vehicle. GM used two different types of dryers in those years, one with the same size fittings on both sides - I believe both 5/8 - the other with a larger fitting on the condenser side, which I believe is 3/4 or maybe even 7/8. I ran into this once and put my plumbers hat on and used a brass adapter without any problems. Not saying you should do this though.
Have you reached out to the site sponsor on this?
Looks like you might need the 37-132569.
Part Description69-76 GMC TRUCK CONVENTIONAL SERIES 80-
Fitting In3/8 FO
Fitting Out3/8 FO
Part Description68-72 GM 7/16 X 3/8 FIO 3 X 8.5
Fitting In7/16 FO
Fitting Out3/8 FO
Thanks. I ended up ordering OEM 3046235.
I'm 99.9997% sure the one I got off the junk truck that I used in my mock-up is correct for the system.
When the new one arrives, if it fits, I'll let you guys know so you can update your store front. I'd hate to see somebody else order the wrong one.
Does anybody know what you measure to determine what your hard line AC is? On a 3/8" Female o-ring fitting, what is 3/8"? The opening in the hard line?
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