Quote:
Originally Posted by fliprayzin240sx
Move it to the upper radiator hose...you need to see what's coming out of the engine, not coming in. You're measuring the colder coolant going into the engine after its been cooled by the rad.
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Not quite. You'll want to measure what is going into the engine. If the normal operating temperature is 180*F for example, you will want to maintain that 180*F entering into the engine. That lets you know that the thermostat is working and the radiator/fan setup is cooling properly.
edit: OP what radiator + efan setup are you using?