Quote:
Originally Posted by marybeth
My question -at at idle up to 45-50MPH the temp guage sits steady at 85C. However on the highway at 65-70MPH the temp gauge is at 90C. (No AC or heat on in both cases)
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The engine works quite hard at 70 mph and is running at 3000 rpm. It generates a fair amount of heat. The only way for the engine to increase coolant flow is for the thermostat to open a bit more.
The only way for the thermostat to open a bit more is for the engine temperature to rise a bit.
Many of these engines run all day at 90-95°C. without any ill effects. Chasing this ghost is usually non-productive for most.
My '84 decided to run at about 96°C. a few years ago without any obvious culprit. I did change the 'stat with no benefit. The radiator was also changed a couple of years later due to leaks. No change. I suspect the gauge but I'm not chasing it down.