Just replaced last week every cooling system component aside from the water pump. Still seems to be rockin' just fine. I have the proverbial waterfall noise coming from the dash, so I know there's air in the system that I'm hearing as water and the air bubble rushes through the heater core. I've bled the system twice since the big overhaul day and the waterfall noise has reduced, but is still there. Happens only on acceleration from a complete stop, and even then, not every time, and also, again, it's lessening with every bleed. Question though... How many times do I need to bleed this dam* thing before it goes away? My bleed procedure in complete detail is this...

1. Starting with a stone cold engine, usually first thing in the morning.
2. Unclip coolant expansion tank.
3. Unclip top radiator hose from clips in fan shroud.
4. Open bleed screw.
5. Remove expansion tank cap.
6. Hold expansion tank about 6 inches in the air.
7. Pour coolant mixture into expansion tank.
8. Wait for bubble-free stream to run out.
9. Once it does, replace bleed screw.
10. Refit expansion tank cap.
11. Re-clip expansion tank.
12. Re-clip upper radiator hose.

This is correct, yeah?

Some additional notes... One, this morning when I unscrewed the bleed screw, it made a small air-escaping noise. I know that can sometimes be associated with exhaust gases being pushed into the cooling system via a bad head gasket, but I have zero reason to suspect a bad head gasket. The exhaust is clear, the oil never has water in it, and the coolant level doesn't lower.

I mean, I'm sure there's a ton of air that's introduced into the system by replacing all hoses, the radiator, throttle body heater, back-flushing heater core, etc... But just want to check-in and see if this is on par or it's indicative of a problem. This issue never existed before the overhaul. Though...the heater didn't work either. ¯\_(ツ)_/¯

 

You need to get the nose of the truck pointed up.....put it on ramps or park it on a hill. Run it up to temp for for 10 mins or so. Shut it off and let it sit overnight. Open the bleeder in the morning and fill thru the bleeder hole. repeat this process to no coolant can be added. Check and see if you are getting HOT air form the heater. If you are you should be good to go.

 

The noise is normal if you have air escaping the highest point in the system.

Add some coolant to replace that air if any will fit through the bleed hole when it is cold.

 

Yup this works for me every time
just poor the coolant in slowly and in stages 30 second intervals

 

Raise the front. Park on a hill. Squeeze the hoses.

 

Light some candles and play some Marvin Gaye.