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#1 |
Registered User
Join Date: May 2016
Location: Oklahoma
Posts: 199
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Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Trucks
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.
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1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs |
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#2 |
Senior Member
![]() Join Date: Apr 2013
Location: Houston,Tx
Posts: 784
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Re: Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Truc
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.
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1966 C10 Mary 1972 C10 Cheyenne "Betty" https://67-72chevytrucks.com/vboard/...d.php?t=847364 1976 C35 Sierra Grande "Mr. Harvey" 1979 C10 Silverado "The BIG TEN" https://67-72chevytrucks.com/vboard/...d.php?t=841339 1982 C10 Silverado "Lucy" C10 Club Texas -HMIC |
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#3 |
Registered User
Join Date: May 2016
Location: Oklahoma
Posts: 199
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Re: Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Truc
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?
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1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs |
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#4 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,513
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Re: Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Truc
Low side sounds really low. I would expect 45-55 or so. Was that at idle or a higher RPM, and did you have a big-a$$ box fan blowing at the condenser?
My only A/C experiences have been with complete V/A systems, and just today a 99 Chevy pickup. At around 85 deg ambient at 2,000 RPM we got it blowing 45 at the center vent, and, as I recall, pressures were 45-55psi and 150-160psi. I assume you pulled a vacuum on the system before charging, right?
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#5 |
Senior Member
![]() Join Date: Dec 1999
Location: Southern California
Posts: 2,812
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Re: Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Truc
Insufficient airflow across the the condenser will cause low suction pressure and higher head pressure. Why would you set POA under freezing? Should be at around 27.5 PSI. The stock mounting with condenser spaced away from radiator is not good for airflow unless driving at speed. Mount against rad, construct a shroud or add an auxiliary fan to improve performance at stops or low speeds.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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#6 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,563
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Re: Vintage Air SureFit Condenser Kit 21567, for 1967-72 C10 and C20 Chevy & GMC Truc
As I recall, these trucks recirculate air through the kick panel vent and the air travels through the cowl. I followed the path and that sends the air through the outside of the vehicle and has the potential to warm the air. There is a cowl vacuum activated door that must be in working condition for recirculation to work. That being said, this path has always worked and guys on here say it should not matter and a good working system should freeze you out anyway. I went ahead and created a path that does not go outside for recirculation. I have not tested it yet. Another thing is that you might want temporarily disable your heater to see if there is heat affecting your cool air. I live in Florida so the heater is seldom used. Most newer cars have the condenser right up against the radiator and electric fans. I may have missed it but what compressor are you using and is it new?
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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