Check your coolant level. This usually happens when the level is low. The sound is coming from your heater core. When you accellerate, you're forcing water through the system, and into the heater core.
I lost a heater core on an old mustang that I had. I heard water running, and eventually I figured out that it was the heater core. I just re-routed it until the winter and then replaced it with a wrecking yard unit.
Had this problem with a 4.3 Chevy work truck I had... Every time I heard it, it made me have to pee! :roll: Keep an eye on your temp gauge, if it starts to get hot, pull over and shut it down. Was the coolant level just low, or do you have a leak? These trucks have a bit of a tendency to have the rear intake manifold gasket go out, and you may not realize there is an issue until it's too late.
There is no way to replace the freeze plug without removing the engine.
Today I removed the front of the Suburban so I can easier access the engine.
But when I removed the AC radiator the connection plug broke of
So I need a new AC radiator. :evil:
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