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Q:

how to tell if my heads are cracked on a 2002 hyundai sante fe on 2002 Hyundai Santa Fe

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when on the freeway my temperature hand sometimes goes past the halfway mark
(2) Answers
To check if the heads era cracked , they need to be removed from the engine and pressure tested. Probably be more cost effective to have a shop(that you trust) diagnose the overheating issue properly. Give them all the info you can as to the conditions when it overheats.
if engine light is not on you can have a coolant flush and change the thermostat. test cooling fans if they come on when you have the ac on then there working