What's up with this noise?

[MountaineerTom]

I think I've seen people post this before, but can't remember where.  Occasionally I've noticed what seems like a gurgling sound coming from near where the heater core would be.  Usually notice it when after starting the truck when the engine is cold.  I can rev it up a little (3-400 RPM's) and the sound changes with the RPM change.  Everything is cooling fine and I have not lost any coolant.  

 

Anyone else hear this on the new Silverado's?  Just curious.

[Shaners]

Something must have happened when you were doing those burn-out videos!!!   LOL

 

Actually Tom, the only thing I can think is you have an air bubble in the system somewhere...  Maybe it'll work it's way out...

[MountaineerTom]

Quote from Shaners, posted on Oct. 23 2001,8:36

Something must have happened when you were doing those burn-out videos!!!   LOL

 

Actually Tom, the only thing I can think is you have an air bubble in the system somewhere...  Maybe it'll work it's way out...

 

LOL!  It did do it before that though.   I was thinking maybe an air bubble too, but wasn't sure.

[MountaineerTom]

I followed these steps, from Neil1500HD, and no more running water sounds so far. Just passing on the info.

 

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Get a jug of DEXCOOL (Havoline brand is GM approved).

Park on level ground.

 

The engine needs to be cool, or just slightly warm is fine too.

 

Add fluid in the surge tank until the level is slightly above the split line on the tank (an inch or so).

 

Put cap back on loosely, don't allow it to build pressure.

 

Start engine and let it idle for a minute.

 

Then, cycle the engine from idle to 3000rpm in 30 second intervals untill the engine coolant reaches operating temp and the thermostat opens.

 

Shut off engine and remove the cap.

 

Start engine and let it idle for a minute. Fill the tank to 1/2 inch above the "Cold Full" mark on the tank & put cap back on loosely.

 

Cycle the engine like before and wait for the thermostat to open again, then shut off the engine.

 

Put more fluid in if necessary, the fluid should be a half-inch or so above the Cold Full mark.