Causes for overheat indicator? Preferred 02?

[Mike Del Tergo]

It appears that even thinking about dropping my aux rad from the Avant is
causing problems.  Yesterday I got the "low coolant/overheat"
indicator symbol on the dash readout.  The water temp guage said below 1/2,
the oil temp was below 2nd has mark, and the rad fan had not cycled and the
overflow tank is not particularly pressurized.  The coolant level sensor
checks out fine, so I am thinking Multi Function Temp Sender or regular temp
sensor in back of head.  If I read Bentley correctly, the head sensor flows
to the MFTS then to the gauge idiot lights?  Any ideas? Also any BTDT for
Bosch generic 3 wire 02 for the car, PN 13913?
Thx
Mike





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