Causes for overheat indicator? Preferred 02?

Chuck Pierce cpcycle at
Tue Apr 15 13:16:54 EDT 2003

 I just replaced my MTFS to get rid of the over temp symbol. ( I also
got some boost back 1.4 vs 1.7 ) Pull the connector off and take it for
a drive, the problem should go away if the MTFS is the problem.

91 200tq Avant ......Very slowly getting sorted out.

Mike Del Tergo wrote:

> 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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