temp. sensors

Do temp sensors such as coolant and engine temp sensors actually have an effect on the temp of the running engine or are they just sending info for the gauges?
Thank you.
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johndoh opined in

The ECT (two-wire) is ONLY used for the ECM, not gauges.
The gauge/light sender is one-wire
But the ECM does NOT "control" the temp of the engine.
It adjusts mixture/timing based on the temp
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On Sun, 31 Aug 2003 16:53:56 -0000, Backyard Mechanic

Thanks.
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Some models will also shut down the A/C compressor if engine temp is too high.
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