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Re: Electric Fan to Manuel Fan
This. The whole idea for getting the nose high is to get the air bubble to move. I have worked on a few vehicles that squishing the radiator in your hand did the trick also.
The idea behind drilling the thermostat is to let the coolant bypass it when cold and even out the cycling when hot.
If you have access to a heat gun I would verify the gauge readings. 220 degrees is pretty hot and lends to the air pocket theory and the sender seeing steam temp instead of coolant. If the temps are actually that hot after forcing the fan on there is probably something else going on.
Good call to the guy saying the sending unit is probably a switched ground. This is common on electronics and can work fine on a relay. I am used to relays being hot side switched, technically positive side switched.
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