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Originally Posted by snmazer
It does only seam to happen when the engine is "cold". It is about 60 degrees here, but I didn't drive my Hummer for about 20 hours. It made the pshhhhhhhhhhhhht sound about 4-5 times. Immediately after start up, then tapered off as I drove. Ther were about 2-5 minute intervals in between the annoying sound. It seems like it quits after the engine is warm.
If it were an exhauste leak would it be a continuous sound though?
As far as the AC, I haven't used it at all since last summer, not sure if that matters or not.
Thank you so far for the replys, and if anyone else has any ideas please post them.
Scott
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As the engine heats up the exhaust manifold expands and might be sealing the leak if you have broken bolts. I had 2 broken bolts replaced about 6 mo ago. Luckily it was under warranty because they had to pull the heads to get to the bolts to extract them. And yes I did have a hissing sound when engine was cold.
BTW...it's a good idea to run your AC for a few minutes even during the winter so the seals in the compressor don't take a set and possibly start to leak