2001 Montero Sport 3.0 Overheating on Grades - Mitsubishi Forum - Mitsubishi Enthusiast Forums


Mitsubishi Montero & Montero Sport This sport utility vehicle offers more size than the other Mitsubishi SUVs, but manages to keep a sporty look and comfortable feel, unlike many larger SUVs.

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Old 07-08-2018, 12:05 PM
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Default 2001 Montero Sport 3.0 Overheating on Grades

Have a 2001 Montero Sport 3.0 that is overheating on uphill grades after 20 miles or so.

Have already replaced all belts, radiator hoses, water pump, thermostat, temperature sensor. Did a coolant flush and running new coolant. Not losing coolant and appearance is normal.

After 20+ miles going up moderate grades (CO front range) the temp gauge slowly heads up from the middle of gauge to the max. Bought a dongle to plug into computer to get an accurate temp readout using OBD Fusion on a Kindle Fire. It is hitting 240 degrees and up to 250 degrees on steep hills. This is with ambient air temperatures of 60-85 degrees. So it isn't the temp gauge issue.

Pulley driven fan behind the radiator seems to be functioning correctly. Electric fan in front of radiator comes on with A/C when parked.

Any ideas on what to check next? Radiator? Fan Clutch?
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