'89 200 running cool

[P. Stegawski]

My 200 TQ does the same thing. I made it a lot better by putting in a new
thermostat, but the car still runs a little cool. Coming down from a ski
area (ie. start car and let it coast downhill) it still doesn't warm up,
so I let it run for a few minutes to get up to temperature, and then it
doesn't cool off when driving. My oil temp. gauge also reads low, but it
doesn't change for some reason whether the coolant temp. is low or in the
mid range, so I suspect that oil temp is not reading correctly.  The
thermostat I bought came from the dealer, and opens at 87C (I think that
is what was stamped on it). Does anyone know of higher temp. thermostats
that work for these cars? Right know during prolonged freeway driving the
coolant temperature settles to 1/3 of the scale - is that normal?

Peter
'90 200 TQ

On Fri, 24 May 2002, Jon Boyer wrote:

> 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 wo=
uld
> 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 re=
ach
> the midpoint of the gauge only if ambient temps are 70+ =B0F.  If it is c=
ool
> 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 caus=
ing
> 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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