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Originally Posted by CrazyHorst
Since you've already been thru the IAC, I'd also say another possibility is to look at changing the engine coolant temp sensor.
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Good point, but the same sensor is used for the guage and the PCM. If there was a problem with it, He would notice the guage not working or the PCM would trip a DTC.
Maybe the t-stat is sticking open, or the car is low on coolant... Causing longer warm up times.