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2025 C2 of the Year ('64-'66) Finalist - Unmodified
2025 C5 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Finalist - Unmodified
2022 C2 of the Year Finalist - Unmodified
2021 C5 of the Year Finalist - Unmodified
St. Jude Donor '25
2000 AC help please
The car has 60K on it. I've replaced the compressor and accumulator, and flushed the condensor. It pulled about 28 with the vacuum pump, shut the pump off and it held vacuum for over an hour with no leak down. I added 1.5lbs of R134A and at 90 degrees and 35% humidity the gauges are reading about 25 and 195 - so pretty close to the numbers in my shop manual. However, it's blowing cool, but far from cold air.
We're taking this car with our Corvette club from the Seattle area to Eureka, CA and back in about a week and a half.
So - what did I miss? How can I get this blowing nice and cold?
Thanks
The car has 60K on it. I've replaced the compressor and accumulator, and flushed the condensor. It pulled about 28 with the vacuum pump, shut the pump off and it held vacuum for over an hour with no leak down. I added 1.5lbs of R134A and at 90 degrees and 35% humidity the gauges are reading about 25 and 195 - so pretty close to the numbers in my shop manual. However, it's blowing cool, but far from cold air.
We're taking this car with our Corvette club from the Seattle area to Eureka, CA and back in about a week and a half.
So - what did I miss? How can I get this blowing nice and cold?
Thanks
What does the fender sticker call for ?
Did you use 12oz cans?
Did you add oil for each component?
Did you purge the lines before servicing?
Did you compensate 2oz for the gauge lines?
Did you compensate 1oz for each can?
Last edited by lucky131969; Aug 13, 2025 at 12:55 PM.
The car has 60K on it. I've replaced the compressor and accumulator, and flushed the condensor. It pulled about 28 with the vacuum pump, shut the pump off and it held vacuum for over an hour with no leak down. I added 1.5lbs of R134A and at 90 degrees and 35% humidity the gauges are reading about 25 and 195 - so pretty close to the numbers in my shop manual. However, it's blowing cool, but far from cold air.
We're taking this car with our Corvette club from the Seattle area to Eureka, CA and back in about a week and a half.
So - what did I miss? How can I get this blowing nice and cold?
Thanks
Your pressures sound low. At 25 psig, your suction line should be freezing and if you run long enough, your evaporator will freeze and air flow will reduce dramatically. If you are using an OEM compressor, it will not pull down to 25 psig because it varies the compressor pumping capacity to control the low side pressure to the low 30’s psig.
can you provide some more back ground. Why did you replace the compressor? Did you replace the orifice tube too? Is your suction line cold at the temperature conditions you described.
IIRC, the 2000 takes a slightly different amount of refrigerant than some other model year C5s. My 2000, again, IIRC, takes 1.75lbs, which equates to 28oz. So if you're at 24oz., you're a little shy of maximum charge. Without running out and looking at my right inner fender, I can't be 100% certain, but I'm 99%. Also, my evaporator would hold a vacuum overnight. But it wouldn't hold a full charge under pressure. Bought a sniffer and it told me the refrigerant was coming out my dash vents. In 2 weeks time, there wasn't enough left to activate the compressor. FWIW, and hope this helps....
2025 C2 of the Year ('64-'66) Finalist - Unmodified
2025 C5 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Finalist - Unmodified
2022 C2 of the Year Finalist - Unmodified
2021 C5 of the Year Finalist - Unmodified
St. Jude Donor '25
Thanks for the replies everyone. Much appreciated. I did replace the orifice tube. My 2000 Corvette factory service manual states 1.5lb R134, but the fender calls for 1.75lb - thanks for the heads up.
This pic is from my 2000 Corvette factory service manual. I was using the pressure numbers for 30% humidity and 90 degrees which looks like 24psi and 187psi. Should I be using different numbers?
Thanks for the replies everyone. Much appreciated. I did replace the orifice tube. My 2000 Corvette factory service manual states 1.5lb R134, but the fender calls for 1.75lb - thanks for the heads up.
This pic is from my 2000 Corvette factory service manual. I was using the pressure numbers for 30% humidity and 90 degrees which looks like 24psi and 187psi. Should I be using different numbers?
It is temperature and pressure of the refrigerant that provide a cold evaporator and cold air. Is your line at the service port cold and about the same as the high side line after the orifice tube?
Thanks for the replies everyone. Much appreciated. I did replace the orifice tube. My 2000 Corvette factory service manual states 1.5lb R134, but the fender calls for 1.75lb - thanks for the heads up.
This pic is from my 2000 Corvette factory service manual. I was using the pressure numbers for 30% humidity and 90 degrees which looks like 24psi and 187psi. Should I be using different numbers?
Ok, so you asked for help, but did not provide feedback to questions asked that will ensure you have the system properly service........other than the fender sticker. If you do not have a properly serviced system, the table is not even worth looking at.
2000 AC help please
