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Overheating

(2003 Ford Expedition)
in Fontana, CA on July 20, 2009
MY car overheats every summer when I use the A/C.
I have took it in for various services and no one can figure out what's wrong.
This started happening after I got some flushes done a couple years ago.
Ever since then when its over 90 degrees the engine gets really loud and I have to turn off the A/C and suffer.

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Popular Answer
Air conditioning does put an extra load on the engine. I wonder if the radiator itself is a little restricted internally or if you should put a slightly cooler thermostat in the engine. I will send you an article I wrote about testing the cooling system. The radiator efficiency and "block check" paragraphs may be relevant to your running hot issue.
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