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max safe operating temp. of a 454


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Posted

200 or so is probably okay seeing how it's probably got a 195 thermostat in it. Do you smell antifreeze when it spikes? Sounds like the thermostat is wanting to stick close. If you have an infared thermometer you can check the housing temp and see if it's even close to the gauge reading. The cooling system might need a flush also.

Posted

I had the same issue with my 97 K1500. I changed the thermostat and backflushed the cooling system while the thermostat was out. That fixed it.

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