Well I'm driving the van tonight, waiting for the
gremlin to come back. Temp Sensor II does seem like a
likely culprit but, the resistance has matched the
chart every time I've tested it though. One time there
was a bit of flutter on the reading, but I can't be
sure it wasn't the rigged up connection between the
alligator clips I put on it and the probes from my
cheap little digi multimeter. (I see a lot of flutter
every time I first touch something with the probes).
If the sensor is busy _failing_, but not completely
broken yet, would it create these random symptoms?

If I switch out the sensor as fast as possible - i.e.
with minimal coolant loss - would I have to burp any
air bubbles out of the coolant system? (I've heard
this is important when refilling the coolant).

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