Gang Ive been hearing that sound for about 2 months now. The heads were replaced on my D1 the fluid levels are fine (maybe a bit over full) and I have pulled both the res cap and the rad screw with the heat on high and let the engine idle for about 5 min or so until it got to full warm. I have excellent heat and the temp gauge has never gone much above the half way mark. Any suggestions? Ive read must of what I could find on this sound but I dont seem to have the symptoms that most have? Thoughts???

 

Have you changed the radiator cap itself, if u have a bad seal could be boiling. Just a thought, but if your not seeing a high engine temp than im not sure, worth a try.

 

If you are hearing the sound you ail have air trapped somewhere in the system. Did you put the rad cap back on before the reservoir? Was the truck running?

 

Have you had to put any coolant in your system?

 

The truck was running when I sealed the system, I think I put the rad plug in first and then the res cap but Im not 100% sure. I have not had to ad coolant except when I first got the truck after the head gaskets were fixed. The level has been constant. I will try a new rad cap 15lb???

 

It takes longer than 5 min to purge the cooling system of air, it takes 20 min or more.
You need to start over, with a stone cold engine, remove the plug in the radiator, remove the radiator cap.
Let the engine idle until hot coolant comes out of the radiator plug, replace the plug.
Then once a nice steady stream of steam comes out of the overflow tank replace that cap too.
This whole time the heater is on full hot and the engine running.
With the system closed the air cannot escape.

 

My task for today thanks Spike.


BTW the way Spike the lug nuts dont fit, the thread size is to small but they are in the process of manufacturing them $79.00 for a full set of D1 solid lugs!

 

It also helps if the front end is raised up too, up hill, on ramps , etc..... when bleeding the system.

 

Worst case scenario find someone with a airlift. I am fortunate to be a tech and have my own with shop air to operate it. Never have air pockets in my systems.

 

You"ONLY" bleed the coolant system when the engine is stone cold and "NOT" running. Better start all over.