Hissing sound when parked

[TXSkier]

Has anyone noticed that when you park your truck you hear what sounds like water hitting hot metal and a hissing sound? I’m guessing it’s AC condensation hitting exhaust piping, but just curious if others have heard the same?

 

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[Wakinvol]

My 2021 6.2 Trailboss did that. A/C dripped down onto the exhaust. The cross pipe that joins both sides.

 

[TXSkier]

My 2021 6.2 Trailboss did that. A/C dripped down onto the exhaust. The cross pipe that joins both sides.

Best I could tell it was the cross pipe so that makes sense! Thank you sir.

 

[landon.allison]

I just bought a 2021 GMC Sierra AT4. I have the same hissing noise due to water hitting the top of the cross pipe. Anyone have any fixes? Can you prevent the A/C condensation from hitting the pipe somehow?

 

[gemarsh]

I just bought a 2021 GMC Sierra AT4. I have the same hissing noise due to water hitting the top of the cross pipe. Anyone have any fixes? Can you prevent the A/C condensation from hitting the pipe somehow?View attachment 27719

Welcome.

If'n the sound of the condensate hitting the crossover pisses you off, wait till you have to service the tranny!

 

[gemarsh]

Nothing like having a hot exhaust pipe spewing rising heat an inch from a transmission oil pan.