xXSunriseXx
Junior Member
- Joined
- Jul 28, 2025
- Posts
- 4
- Reaction score
- 14
- Location
- California
- First Name
- Alex
- Truck Year
- 1980
- Truck Model
- C20
- Engine Size
- 5.7L 350
Hi y'all,
Posted in Tech Discusion awhile back and got no responses yet; thought i'd see if there would be any luck here...
I've been running through the 1980 C20 I just bought, and have been troubleshooting an intermittent squeaking that occurs when accelerating.
It starts and speeds up on acceleration, and goes away for the most part when speed stabilizes/evens out, or I let off the gas.
The A/C compressor was what I was initially looking at because it wasn't working/had no pressure when I got it. It might still be good for all I know at this point.
I adjusted the compressor because the belt deflected about an inch, and it is now about a 1/2 inch by feel (haven't verified). I could go to 1/4 inch, but I'm reluctant with some of the other issues I see.
The squeaking went away for a bit, but came back the next day. Tried some belt dressing (I hate the stuff), and it started squeaking at idle when it hadn't before. No dice.
It no longer squeaks at idle now, though.
I've also noticed some wobble in the steering pump pulley, which seems to come and go under idle. Going to attach a video...
I've read through a thread on steering pump pulley wobble
I just want to get some ideas on what might be going on here before I start further in on things...
I'd rather hang on to the old pump and service it if possible.
A/C compressor will eventually be replaced, but it's not urgent on the list because $$$, and it's spinning freely.
Steering is fine with no grinding, groaning, or whining when turning.
No Squeaking when parked or engine revved.
Seems to only happen when under load of acceleration.
I did notice a ticking sound from that general area that seems to correspond to the wobble the other day when I started it up. Might be able to hear it in the video.
Any ideas on what might be going on here before I start further in on things?
Posted in Tech Discusion awhile back and got no responses yet; thought i'd see if there would be any luck here...
I've been running through the 1980 C20 I just bought, and have been troubleshooting an intermittent squeaking that occurs when accelerating.
It starts and speeds up on acceleration, and goes away for the most part when speed stabilizes/evens out, or I let off the gas.
The A/C compressor was what I was initially looking at because it wasn't working/had no pressure when I got it. It might still be good for all I know at this point.
I adjusted the compressor because the belt deflected about an inch, and it is now about a 1/2 inch by feel (haven't verified). I could go to 1/4 inch, but I'm reluctant with some of the other issues I see.
The squeaking went away for a bit, but came back the next day. Tried some belt dressing (I hate the stuff), and it started squeaking at idle when it hadn't before. No dice.
It no longer squeaks at idle now, though.
I've also noticed some wobble in the steering pump pulley, which seems to come and go under idle. Going to attach a video...
I've read through a thread on steering pump pulley wobble
I just want to get some ideas on what might be going on here before I start further in on things...
I'd rather hang on to the old pump and service it if possible.
A/C compressor will eventually be replaced, but it's not urgent on the list because $$$, and it's spinning freely.
Steering is fine with no grinding, groaning, or whining when turning.
No Squeaking when parked or engine revved.
Seems to only happen when under load of acceleration.
I did notice a ticking sound from that general area that seems to correspond to the wobble the other day when I started it up. Might be able to hear it in the video.
Any ideas on what might be going on here before I start further in on things?
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