Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Trucks

[bry593]

I installed a Vintage Air SureFit Condenser Kit in my '71 Chevy C20 pickup.
https://vintageair.com/1967-72-chevr...r-kit-w-drier/
It fits all the original holes in the radiator core support and the lines screw into the OE liquid and vapor lines. The parallel flow condenser does a good job of keeping head pressures low even when the truck is sitting still at an idle. Decent upgrade in my opinion.

This video, https://www.youtube.com/watch?v=Z0_4IpBTlAk, shows how to vacuum and charge the system with R134a. Because the new condenser and drier are of smaller volume, the recharge only took about 26oz of R134a. That is two 12oz cans and just a tiny amount from a 3rd can. Pressures once stabilized were 26-28 psi on the low and about 250 psi on the high with ambient temps of 94-95F. Outlet temps were blowing about 58-60F. I was hoping for colder, but I've not checked my HVAC blend door to see if it opening/closing correctly.

Note that before charging I adjusted the POA valve relief pressure to 26 psi. This puts the evaporator temperature at 2 degrees below freezing. I'm hoping it doesn't develop ice on the evaporator coil. So far, so good. Probably would freeze up if I run the a/c in cooler temperatures, for instance when using defog.

[PowerdbyChevy79]

It will develop ice with the defrost... but turning the heater on for a min or two should thaw out any ice build up. That's what commercial walking freezers and refrigerators do..
You're probably right about running it in cooler temps.

[bry593]

Will see...

A little disappointed in the outlet temps. I checked my temperature and direction HVAC doors and everything seems to be working. I'd guess the gaskets are toast after 53 years. So probably some leaks on the air intake and exhaust. Service manual says a 4 season GM system should get 40's Fahrenheit at 90-100f. Something isn't quite right.

I can say the condenser is working well at keeping pressures low. The evaporator is putting off a lot of condensation. That cold just isn't making it efficiently to the cabin. Leaks, right?