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Cooling System/Sensor Acting Weird, A Puzzle for Experts

Your low speed fan comes on at 217 and the high speed is 226 since you have an 04+ car.

There are 3 relays for the fans. The fans are wired in series for low speed, that's how they get the low speed out of them.

The fans are wired in parallel for high speed operation, and this is the reason there are 3 relays, 2 are for high speed and 1 is for low speed.
 


Scottydoggs said:
your temps are normal, stop asking silly questions.

a moving car runs cooler not because of the fans, but air flow from driving.
Click to expand...

All other cars (a 2008 impala 3.8L that a friend of mine has, for instance) don't drop to 190 when it's windy or when driving on a highway, and then go up to 220 after afew lights in the city, if I get what you meant, sir. They all stay pretty much in the middle (210) at all circumstances.
 
My 05 GTP ran at the first mark below half for years. Now it regularly goes above half and everyone says it's just normal for these things.

My scanner/Torque app showed that the fans kicked in at 220 and back off at 200.
 


That's about right, but you aren't really going to see when the fans actually come on depending on conditions. It takes time to cool once they do come on so the temp will rise 2-3* before it starts to drop.
 
I'm still over here trying to figure out why fan 2 never gets to high speed :(. That's my issue at least.
 
buck531 said:
I'm still over here trying to figure out why fan 2 never gets to high speed :(. That's my issue at least.
Click to expand...
three probabilities:
Either a bad fuse/relay
Bad wiring
Or, the fan motor winding itself is acting up

It is very improbable that the computer may cause your high speed not to kick in.
 
Gentlemen, after a long online research and calling experts, I found a very interesting website with a few articles about this thread that I started, I hope it helps many of us. The sensor does not last forever. Here are two samples:

http://www.underhoodservice.com/diagnostic-solutions-engine-coolant-temperature-sensors/

http://www.underhoodservice.com/sat...-a-cracked-engine-coolant-temperature-sensor/

Thanks to everyone who read and/or replied here.

It looks like I will have to ignore the warning that I received here about changing or messing with the sensor, since I already bought a new AC Delco (made in Israel) one.

And, BTW, I mentioned something wrong above, when I said that the voltage coming to the sensor was 1.2V. I measured the voltage between the two wires coming to the sensor when it was unplugged and that was wrong. I just measured each of the wires with respect to battery ground and they were 0 and 5 volts.
 
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