this summer we took two long trips in the Sierra, about 2k mi total, with several long climbs where the temp climbed up almost to the 120 mark; but once we got over the passes, the temp would sink back down.

Now that I am hone, the car runs around 90, and it used to run at just over the 80 degree mark beofe the trip.

What gives? Other than a coolant flush and thermostat check, is there any maintainence that I should condsider?

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'83 300SD, 202K
'76 Ranger 23

Water pump
Aux fan
Coolant leak…

http://www.peachparts.com/shopforum/showthread.php?t=99466&highlight=running+hot