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Just had the chance to hook up the Durametric and I think I understand the nature of the issue but will need more time to figure out the cause and correction.
Some details. The engine compartment temperature can be monitored real time. I started the car and let it idle. The temperature (all engine compartment) slowly rose to 75C until the engine compartment fan kicked on. It went down to 74.3, but then continued to slowly rise while the fan continued to run. At around 77.5C the coolant light started to blink. My conclusions are the temperature sensor and fan are working but there is not enough cooling capacity to keep the compartment cool enough. This assumes that the coolant light should come on around 77.5C. Next step is to open it up and look for air restrictions and fan condition. Any other ideas/insight appreciated.
It is not the coolant level….
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