Quote:
Originally Posted by TurbineGuy
I own a 1991 E300 with a 124 030 engine. I rarely drive it but my wife insists that it reaches the temp red line very regularly.
Any thoughts?
Thanks, Playing it Safe
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That's getting pretty hot for just a driveway test.
Here's what I usually recommend in the order that starts out 'cheap' . . and then gets more expensive;
1) You said your fans were working . . since they were replaced, make sure they are "drawing" air . . not pushing air out. Don't laugh, there's a thread here where the fans were installed incorrectly.
2) If the radiator cap has not been replaced in a while, do it!
3) Tstat could be sticking . . . If it's not been changed, replace with a 80C version
4) Check the af/water ratio . . with a hygrometer (Prestonas AF-1420 or eg) shown in MENU#17. Make sure that it's no more than 50/50. If you live in So Cal or hot climate, make it 40/60. If the coolant is "old", and over 50/50, flush and drain the rad. Only refill with af and DISTILLED water.
5) May have a plugged radiator from "old-age". Feel for cooler spots, if so it probably is time to replace it. If it's only 'seen' tap water, it's probably partially plugged.
This above assumes that you didn't blow a head gasket. . .