I had the exact same problem. -Engine temp 60 C. and penguins running around in the cabin.
I replaced the thermostat and my engine temp. went up to 85-90 C. and i can now toast a loaf of bread on the dashboard.
$15 and ten minutes of work. Do it!
Never criticize someone until you've walked a mile in his shoes. That way, when you do, you're a mile away -and you have his shoes!
'86 300E optically converted to '95 E300 (Sold)
-Blauschwarz on silver
-17" AMG & 15" AMG for winter