'89 200 running cool

[Jon Boyer]

1989 200 TQ 10V 185kmi

Thanks to the listers who helped me fix my non-functioning temp gauge -
Sending unit and wiring were the culprit.

I noticed right away that the temp gauge needle only made it to the first
heavy line (about midway to half scale).  If the car sat and idled, it would
reach the midpoint of the gauge.  Start driving, and the needle drops.  I
replaced the Thermostat, and there is no change.  At highway speeds, I reach
the midpoint of the gauge only if ambient temps are 70+ =B0F.  If it is cool
out, the car does not appear to warm up.  I also notice about a 2 MPG
increase when the weather is warmer.

Some of my thoughts:  Another temp sensor related to EFI is bad, and causing
me to run rich when air temp is colder.  O2 sensor has been on there for at
least 100Kmi, Maybe time to replace it anyway...

Any BTDT?

Thanks!

Jon Boyer
1989 200 TQ10V
Lago, 16" A4 wheels
185Kmi and counting

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