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Old 11-20-2013, 10:47 PM
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Graham Graham is offline
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 3,942
Originally Posted by vstech View Post
if that plug is getting hot... there's something wrong with your engine or cooling system... the lower tank should have the coldest coolant. often ambient temp...
Nothing wrong with my engine or cooling system that I know of!

For a rad to work, it needs a substantial temperature difference between coolant and incoming ambient air at both inlet and outlet. Temperature drop of coolant across a rad would likely be in the 10-30F range. Say 20F on average. So if hot coolant is at 180F, then bottom of rad would be at about 160F.

160F is still pretty HOT!

Above is theoretical based on some guesses of heat load and coolant flow. It would be interesting to measure actual temperature using an IR gauge.
85 300D,72 350SL, 98 E320, Outback 2.5
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