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TEMPERATURE GAUGE 700

Hi Guys:
The needle on the temperature gauge on my 87 740 took forever to reach the middle (normal) this morning. After idling the car for 10 min or so
every morning,the temperature usually reaches normal level by the time I take off even in the middle of the winter. This morning after that time the needle was just half way to the middle of the gauge. And only after driving about
20 miles the gauge was showing normal (or close to it) .
What is causing this? Electrical problem with the gauge,temperature sensor,
thermostat... Any ideas? Where/what should I look for?
Tks


PS Now not only the needle takes forever to reach normal level,but it drops
from there as I drive along,to go back to normal. If I turn engine off with needle at normal temperature and turn the ignition back on,needle goes
immediatly to normal...
Can anybody give me a hint?
Tks






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