Thread: Need advice Re: a once off overheating issue

Originally Posted by roverv8

Also with the thermostat,
Drill a tiny hole in the outer ring of the thermostat, between the opening center part and the outer seat.
because the thermostat is at the very front of the valley cover, without the hole & a closed thermostat, it can cause a pocket of cold water/coolant, so the thermostat isn't getting the heating coolant to it to open at temp.
That tiny hole allows coolant to move enough so there is no trapped pocket of cold coolant.
Dont drill the hole to big or it will effect how the thermostat operates,

A reminder that the 8mm coolant hose from just behind the thermostat to the radiator top tank (via the throttle heater) must be in good working order. This negates any need for a bleed hole in the thermostat. You should be able to see a steady stream of coolant flowing from this hose when you remove the filling plug on the radiator (when cool of course). You can delete the throttle heater from this hose in most parts of Australia as we don't get that sub zero often.

Originally Posted by bee utey

A reminder that the 8mm coolant hose from just behind the thermostat to the radiator top tank (via the throttle heater) must be in good working order. This negates any need for a bleed hole in the thermostat..

Yes true,
The tiny hole is cheap insurance though, if the other gets blocked for some reason , the hole is there, just my opinion