Temperature gauge spiking (1 Viewer)

[Ghostrider I]

Right. 91 HDJ80, overhauled engine, new radiator, fan clutch, water pump, etc. After driving 15 or so minutes the water temperature gauge shoots up to red. Fire on heater to offshoot the overheating(?)- no heat. After shut down it pisses out a half cup of water below radiator.

 

[AirheadNut]

Sounds like air bubbles in the cooling system. Where is the coolant coming from on shutdown? Overflow tank, or a loose hose connection somewhere perhaps?

 

[roalco]

Sounds like an airlock from an improper fill to me, too.

 

[BreckenridgeCruiser]

Yep... I usually drive the truck a bit and when I see the gauge climb a bit, I shut it down and then fill and burp... The issue is that the thermostat prevents the system from burping properly on these engines because of the direction of coolant flow...

 

[roscoFJ73]

Fire on heater to offshoot the overheating(?)- no heat. After shut down it pisses out a half cup of water below radiator.

Is the thermostat opening?

 

[Ghostrider I]

Sounds like air bubbles in the cooling system. Where is the coolant coming from on shutdown? Overflow tank, or a loose hose connection somewhere perhaps?

It bubbles in the overflow tank for a few minutes, then stops.