An overheating issue can be from multiple reasons. One reason could be is the fan is not engaging and helping to cool off the engine when it's under load. This can due to a bad fan clutch or possibly the fan clutch relay. You would need to test to find out which (or both) that have failed causing the issue. Once we have determined what needs to be replaced and have corrected the issue then we would retest to make sure there are no other issues.
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