This is why I had a manual over-ride switch put in my van so that I can turn on
the radiator fan to LOW or HIGH  --- BEFORE the engine starts to heat up.
m2cw   Malcolm

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From: John Rodgers <inua@CHARTER.NET>

  A bit more as followup on this subject.  - ................
When the bottom edge of the
needle touched the top edge of the light, I set the heater lever to full
hot and turned the blower on hi-speed. In a little bit the needle was
back down one needle width below the coolant warning light. It stayed
there the rest of the way home. It got mighty hot IN the van, but I
never got the low pressure warning horn nor the warning light.