Squealing noise in the heat??

[c.hargrove]

Hey guys! Chevy newb here... Bought a 79 short bed k10 about 9 months ago. Daily driver right now but long term plan is hot rod. I'm no mechanic but I want to learn and that is what it's all about. Anyway I'm sure this will be an easy answer for someone but my truck makes a sort of intermittent squeal when it's hot... Not the truck, the weather. It's 95 today and about every 15 minutes the truck squeals for a second and goes quiet. I drove the truck 5 hours ago but it's still doing it. I've never heard anything like it before and it's kind of freakin me out - can anyone tell me what it is/if I should be doing something about it? Thanks .


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[1987 GMC Jimmy]

If you're running the air conditioner, maybe it's the belt squeaking when the compressor cycles on. When it does it, try spraying a little WD40 on the belt and see if it stops.

 

[c.hargrove]

Thanks - But I'm sure that's not it, it does it when the truck isn't running and my air con unit isn't even hooked up.


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[Georgeb]

Try to take a video of it somwe can hear it and post it up.

 

[1987 GMC Jimmy]

Wow, how strange..,

 

[c.hargrove]

Wow, how strange..,

Weird right? It's been doing it for a while and doesn't seem to be a problem but I'd like to know what the deal is.



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[c.hargrove]

Try to take a video of it somwe can hear it and post it up.

I'll try to, will be hard to catch it.


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[DanMcG]

Weird, Maybe the radiator cap releasing some pressure?

 

[GTME94]

If it does it while the engine isn't even running and is affected by heat the only things I can think about are something expanding with pressure. Coolant was already mentioned, maybe gas tank releasing pressure because the fuel expanded or turned to vapor.

 

[c.hargrove]

Yeah pressure being released sounds like it makes sense. I don't -think- it's from the radiator, I had the hood open trying to find it and it sounded like it was coming from deeper. Gas tank sounds like a good theory. It doesn't seem to be a problem but I'd like to know what it is! I'll still try to get a vid of it posted up, hasn't been hot enough since I posted this.


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[87ChevyR10]

If you have ever been around motorcycles, the gas caps tend to squeal when it's hot out. The caps have a built-in vent tube to let out excess pressure build up in the gas tank.

 

[c.hargrove]

Yeah found it yesterday... It started doing it while I was driving, then I realized I was pretty low on gas so I put some in and it stopped doing it.

Thanks for your help everyone! It was freakin my poor neurotic brain out haha.


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