Heads recently redone by PO; no overheating indicated by stock gauge, new ultra gauge has not arrived yet. Had coolant flushed before purchase, been bleeding a couple of mornings... Driving today I noticed that I can vary the waterfall sound (in park) with the throttle. First thing I thought was head gaskets, but I have no trouble codes, white smoke or overheating.

Could it be a crappy hose clamp drawing in air when I rev?

Seems to me, if a head gasket was that bad that I could immediately hear a change in waterfall sound then I would be having other symptoms.

 

Air in your system nit properly bleed yet

 

That's the best I can hope for. I have been parking on an incline and bleeding first thing in the AM.

Will keep at it.

 

Or you are bleeding it OK and you still have a coolant leak, time to pressure test the coolant system.

 

With regard to pressure testing, do you mean with a hand pump attached to the radiator? Pump it to operating pressure and look for leaks?

 

Pressure tester than attaches to the overflow reservoir, pump her up. and go searching.

 

YUP, most auto parts store will rent them. Pump to 18 pounds and hold it for 15 minutes, let us know what you find.

 

you dont want to pump it up to 18 psi and just come back in 15 minutes, the whole time it is under preasure you should be wiggling and pulling on hoses, raising and lower the recover tank, give the throttle body heater hoses a tug.

 

Thanks for adding that, this is an important part of testing. Might also pressure test the coolant cap and see if it is holding.

 

Go thru each hose and inspect for cracks and inspect the clamps.
Pay attention to the small hoses -
one at the radiator, a few on the coolant bottle.
There are two smaller hoses at the air intake for a heater there.
And, there are metal hoses into the block - with O rings which can leak..
Any one of these can cause problems.


Of course, you may not have bleed the system correctly.

I don't bleed my system with that bleed screw.

I copy how the Discovery I works.

You can unclip the coolant tank.
It is make to unclip.

Raise it high.
Put rags under it.

Open the cap - slowly if hot.
Put in coolant to the fill line.

Run the engine a 1,500 RPM for about 8 minutes.

Then fill to the fill line again.
Put on the cap .

Tuck the bottle back where it was.

Done.
Should have no more water fall sound.

I did this is Boulder Colorado ONCE in March 2012.
Never had to bleed it again.
And, I have gone about 3000 miles now from that bleed.