Overheating dilemma....need input.

Is there any flow at the radiator neck with the cap off?
Are the hoses for the heater core hot? If not I think the pump is broken.

The burning belt being thrown off leads me to believe that the shaft broke or something bound up the pump for a second.

hmm, this is an odd one. If we're only dealing with one problem at a time, hot at idle is not enough air flow and hot at speed is not enough water flow. Even that points to the pump...not enough water flow at any speed...

I've run:
A stock /6 with stock cooling ( fan shroud and solid fan and stock radiator )
A turbo /6 with electric fan with shroud
A 360 with electric fan and alum rad
Only time it ever overheated was due to plugged radiator core... even here in FL
What kind of HP is your motor and what size radiator?

Checking for water flow at the rad with the cap off will tell you if the pump is working.

Garden hose in the radiator on full blast with the lower hose off will tell you if the radiator is flowing well. If the water backs up out the neck with the lower hose off and the garden hose at full, then the radiator isn't flowing enough.


sorry, message edited about 10 times as thoughts hit me. I'm trying to set a record :lol: