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Originally Posted by 2JZGTE
In my car the temp. can jump around a little depending on outside temp, traffic, humidity etc. Cruising on freeway temps range from 70 to 80c depending on conditions. When its a little cooler ouside, sometimes my car doesn't even want to heat up to the 90c that I have it set to when sitting in heavy traffic. When it's warmer it always goes up to the 88-90c operating range. FYI my car has koyo radiator with twin FAL fans and Pivot fan controller.
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I just recently installed a Pivot fan controller. The guage jumps up tp 10 deg F or more when the fan kicks in. Once the fans come on the engine seems to pulse slowly when it's idling. Does yours do that at all? I've been trying to figure out what is causing it...