Originally Posted by MarshallB
This problem came back with the cold weather.
I did notice that temperature gauge dropped to about 1/4 one time after being at operating temperature (about half scale), so suspecting the temperature sensor, ordered one of those and I can see it at the back of the engine but sure looks like skinny hands and feel required ...
Also poking around found a TSB (C 19-05-02) indicating that engine warm up can be slowed by bad check-valve in hose between main and left aux radiator, but don't understand what a check valve would have to do with warm-up (a thermostat, on the other hand ...).
Now wondering if slow warmup can cause this fault to be thrown. In cold weather probably takes me 10 miles for engine to come to full operating temperature.
Anyone have any thoughts on my little problem?
sounds like the thermostat is sticking open.
when this happens you drive at high speed and the air flow thru the radiator cools down the coolant
if you drive at slow speed is ok as the flow of air is less.