i have a 2002 gmc serria 2500hd and just got 35 FT COUGAR FIFTH WHEEL AND NOTICED ON SOME HUGE HILLS THE TEMP GOT TO 221 IS THIS OK IT CAME RIGHT BACK DOWN AFTER HILL??
It should be fine. You'd have to get the fluid hotter than that to do damage. Especially since this was short term. Have you consulted your owner's manual? It should tell you where teh proper operating range is.
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