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Old 08-15-2007, 09:52 PM
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wscheffer wscheffer is offline
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Join Date: Jun 2007
Location: Ohio
Posts: 108
It sounds as if you corrected the problem by replacing the thermostat, but is the vehicle running at 100 C with the A/C on?

And do you know if the thermostats opening point is the same as the old one (when it functioned of course)?

This may be the cause as to the drastic change that caught your attention. Cause if it was the water pump I would think you would notice the change in temps over a period of time as the part degrades in efficiency. Not a sudden change as you mention.

I know that my 420 runs at 60 C normally and 80 to 90 C with the A/C on if this helps.
1987 420 SEL - Like a fine wine only better with age
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