Question about 1985 Mitsubishi Mighty Max

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Overheating engine I have a 1985 Mighty Max 2.0 5 speed stick. I replaced the water pump,thermostat, new hoses upper and lower, new radiator cap, had the radiator boiled and rodded.did a engine block chemical test it tested ok no water in oil.Did a pressure test on radiator and cap there was no pressure loss for up to 8 minutes then only a half pound loss.Checked the clutch fan it has a drag in it then spins freely as motor runs. I even took thermostat out still overheats. I'm out of answers.

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  • bob_casper20 Dec 26, 2008

    The thermostat was in the right way.I diconnected both hoses from radiator upper and lower ends put water hose in bottom to back flush system, water poured out the top real fast. If there is another way of cleaning out the water passages I don't know about it.The truck is in prefect timing.

  • Anonymous Mar 18, 2014

    I have replaced the thermostat and radiator ,yet the engine still overheats to the max on the gage

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  • 46 Answers

Was the thermostat put in backwards? I know this is a silly question, but I've seen it happen. The water pump will fight it if it is. Another thing are the coolant passages, are they flushed out? Also, if that fan clutch is the original one, I would go ahead and replace that as insurance against the water pump breaking.

Posted on Dec 26, 2008

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Engine Diagrams


Hello. Here a non-photo diagram. Hope this helps!!!

The thermostat is located on the side of the water pump, the water pump is located just above the a/c compressor, the thermostat is fed coolant from the radiators lower radiator hose.
Thermostat :
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ATTENTION :failure to install new thermostat in the correct location will cause engine to overheat.

1. install new thermostat to water pump, make sure air bleed hole lines up with notch, install and tighten bolts, install a new lower radiator hose, fill cooling system.

thermostat # 17670-77E00
lower radiator hose #17854-65G20
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upper radiator hose # 17852-65G20

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