Pressure release - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 01-26-2011, 02:05 PM Thread Starter
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Pressure release

Hello all. I have an issue that has come up and I couldn't find anything related on the forum so I figured I'd ask.

The last couple of days, when my truck has sat for several hours, I've heard a high pithced whistle sound for about a second after I start the truck. It sounds like a pressure release or something similar to that. I'm pretty sure it's not any belts squeeling.

My first though would be that my coolant lid may have a crack in it. I haven't had a chance to have the hood up while someone else starts the truck. I have never had any puking, that I can tell.

If that is the problem, could it be caused by some underlying problem? I don't really hammer on my truck. It is cold here but I usually let my truck heat up for 5-10 min before I drive it anywhere and even then, I go easy on her until it gets up to operating temps.

Any suggestions would be greatly appreciated.

2004 F250 Quad Cab FX4
4.5" Lift with 35" BFG AT's
4" RBP Cat back exhaust
Voolant Ram Air intake
AMP Running Boards
Edge Insight
SCT (canned tunes)
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