Hissing noise from Heat Exchanger

[schmidt67]

Alright heres the deal, I shot a stud thru the heat exhanger, tore the track suspension, everything out, welded the hole shut, re-installed everything... Filled the antifreeze back up. Well took it for a test ride for about 15 minutes, everything ran fine, no leaks, no temp lights, nothing. BUT when I brought it into the garage, shut it off, there was a pretty loud hissing noise coming from what sounded like (I think) down by the heat exchanger.

Any ideas?

Also is there a bleed screw for bleeding air from the lines for the antifreeze?

Thanks

 

[tomseal6]

I get the same thing when shutting down my engine. It makes a sound of releasing some kind of gas (air). I dont have any studs and my Nytro is a 2009 with only 350 miles on it.

If you did a good weld job I'm sure you are experiencing the same thing.