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There are several possible causes, I list them from cheapest to most expensive. Of course overheating may be caused by one or a combination of many of these possibilities:
1) Low coolant level
2) Bad radiator cap
3) Bad Thermostat
4) Collapsed/bad hoses
5) Bad fan clutch
6) Bad/bent/damaged fan blades
7) Clogged radiator
8) Bad water pump
And the worst possibility is: Its just too darn hot out. My W100 works just fine, even with the A/C on up to about 115deg. At that point it can overheat when idling with the A/C on. I've replaced most of the parts listed. Now I just don't drive it when its over 115 deg, and that solved the problem. After all, its an old truck.
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∙ 12y ago
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