Engine Size: 350
Refrigerant Type: 134
Ambient Temp: 65
Pressure Low: 40
Pressure High: 165
Country of Origin: United States
I have a '73 Corvette that has an accumulator system adopted from an '78. It is converted to 134. I had a local shop make hoses and charge it. It has never been able to cool as well as other ones I have seen with the same set up. I checked the pressures and found 25 low 100 high. Temps were as low as 53. So I added freon and got up to 40/165. Temp dropped to 50. It took about 2/3 of a can. Then after running for about 20 minutes temps went up to 60.
What do you guys think? Is an evac and recharge what is needed?
If you know someone with the same setup working well, ask if they know how many oz of R-134a they charge with. Strive to have the same amount in your car.
You may be undercharging it because the condenser fan is not up to par, which will cause the high side to run high even though the system is undercharged. Though it is hard to conclude much at 65 ambient.
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