New York Compressor Noise?
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2nd Gear
Joined: Feb 2025
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New York Compressor Noise?
I have a ‘79 F-250 Custom with factory AC that I recently worked on.
I replaced the compressor, clutch, expansion valve with china’s finest replacements.
I pulled a vacuum to -30mmHg that held all night, then re-charged with 3 cans of R-12 replacement (it’s called Enviro-Safe “Industrial” R134a, but it is really just a mix of propane/butane).
After charging I had around 35mmHg on low side and 55-60mmHg on high side. Put on a new belt and everything was sounding and cooling great!
Weirdly though, when I took it out on the road I engaged the AC and heard this awful rattling sound. Got it back home and took a video of what happens when I engage the AC.
I would appreciate thoughts about what is causing all of this! It still cools relatively well, but I honestly don’t want to run it very long for fear of causing permanent damage to the compressor!
any thoughts are appreciated.
I uploaded video to YouTube bc FTE restricts upload file size.
https://youtube.com/shorts/kt-6K7Ah0Q0?si=JVtK8NLG2nuB_R2v
I replaced the compressor, clutch, expansion valve with china’s finest replacements.
I pulled a vacuum to -30mmHg that held all night, then re-charged with 3 cans of R-12 replacement (it’s called Enviro-Safe “Industrial” R134a, but it is really just a mix of propane/butane).
After charging I had around 35mmHg on low side and 55-60mmHg on high side. Put on a new belt and everything was sounding and cooling great!
Weirdly though, when I took it out on the road I engaged the AC and heard this awful rattling sound. Got it back home and took a video of what happens when I engage the AC.
I would appreciate thoughts about what is causing all of this! It still cools relatively well, but I honestly don’t want to run it very long for fear of causing permanent damage to the compressor!
any thoughts are appreciated.
I uploaded video to YouTube bc FTE restricts upload file size.
https://youtube.com/shorts/kt-6K7Ah0Q0?si=JVtK8NLG2nuB_R2v
Thread Starter
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2nd Gear
Joined: Feb 2025
Posts: 2
Likes: 0
i very well may be overcharged since I calculated two cans were equivalent to the recommended R12 amount, but found it took almost four cans to reach between 30-35 on the low side (what I read was the recommended pressure).
as for the drier, well, I admit I was lazy and did not replace it because I could not get the stupid thing off the condenser (the copper tubing would twist whenever I tried to loosen the nut). I sort of gambled with the fact that if I pulled a vacuum long enough on it (overnight) that I might get lucky and get enough moisture out of the system.
I guess I will re-check the pressures and if it’s high, let some out. And if it’s not, then I’ll have to consider replacing compressor, drier (and by necessity condenser). The sanden conversion idea is interesting.
I was just trying to maximize cost savings on this first try.
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