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Overheating Issues

scrimple101

By scrimple101,
in General Maintenance

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scrimple101 Apprentice

scrimple101

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I have a R31 Nissan Skyline 1989 sedan which is overheating. I have checked the water pump and it is fine and i have replaced the thermostat. It has new radiator fluid and all belts have been replaced. Oil changed and correct level. Does anyone know what could be causing it to overheat. I have thought about replacing the radiator cap but apart from that i'm not sure what else i can do. Regards, Rob Lane. :D

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scrimple101 Apprentice

scrimple101

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It's not a blocked radiator or a blown head gasket because i've had the radiator cleaned and flushed and the head gasket has gone and i fixed it. I think the only thing it can be now is the fan clutch as i've checked everything else. New thermostat, radiator good, water pump good, new belts. Anyone think of any other possibilities? Regards, Rob.

adoboy666 Community Regular

adoboy666

Posted
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i would say yeh the fan clutch as youve eliminated everything else does ur clutch fan seem loose (worn out) eg. with the engine going can u stop the clutch fan? (use something like a rag to stop it)

anyway should only be like $30 for a second hand clutch fan

another suggestion may be the stock guage is reading wrong like most skylines

try an aftermarket gauge as itll be tons more accurate

2LV8ETR Mentor

2LV8ETR

Posted
Posted

Defective fan clutches are a common and often overlooked cause of overheating. The sheer characteristics of the clutch fluid gradually deteriorates over time, with an average loss in drive efficiency of about 200 rpm per year. Eventually slippage reaches the point where effective cooling is no longer possible and overheating results. On average, the life of a fan clutch is about the same as a water pump. If one needs to be replaced, the other usually does too.

Sometimes a lower radiator hose will collapse under vacuum at high speed and restrict the flow of coolant from the radiator into the engine. This can happen if the reinforcing spring inside the hose is missing or damaged.

Also, if the coolant is overflowing from the overflow tank, replace the radiator cap.

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