[W126 Coupe] Running warm

[Dick Spellman]

Hi Pavel:

Have you tested the visco fan clutch?  How many miles on the engine 
since that fan clutch was replaced if it has ever been replaced?

Regards,

Dick

Pavel wrote:

> 
>Hi
>
>Have a new problem with my 380 sec.  Temperature gauge is acting weird. 
>Keeps on running at 90 on freeway, than climbs past 120 than instantly
>drops to 80.  Most of the time sits around 90.  Just put a new thermostat
>in, still same story.  Changed the temp gauge no difference, changed the
>temp sensor no difference.   Sometimes the temperature guage will stay
>right at 80 for 20 minutes and then will start acting strange. Expansion
>Tank seems to be under pressure.  If the gauge is showing 110 deg and I
>shut the car off and right away put it in the on position it the temp gauge
>displays 80.  As I shut the car off the gauge will peg out while the engine
>is stopping. If I accelerate hard on the freeway it will drop the
>temperature temp to 80-85 range. When I coast on a freeway do get back to
>speed limit it will go back to 90-100 range.  If I turn the heat on it will
>bring the temperature up I'm very confused.  Should I try a new radiator? 
>Also I'm in minnesota and it is about 50 deg right now, car should run just
>a hair above 80, like my 560 is.
>
>Also noticed a coolant leak in parking lot after changing thermostat
>thought it was came from the thermo housing when got home no leak
>everything is dry with plenty of coolant left?
>Pavel
>
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