I assume you are sure the cooling system is full of liquid and no air.
My first guess would be the thermostat.
SOURCE: car doesn't warm up
It does sound like the thermostat. The sensor does not control the thermostat in any way, it only reads the temperature of the coolant. Your symptoms are classic of a thermostat that is stuck open or partially open. Take it back and tell them what is going on and have them show you that the thermostat is fine.
SOURCE: coolant doesn't heat up!
the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???
SOURCE: My cooling fan will not cycle off. It runs until the battery dies
At first I would have said it was your relay. They are known to get shorts and stay on. But you had that and the sensor changed. I would have to say it's time to trace teh wiring and make sure the wires aren't rubbing somewhere. It's a pain I know. I would start at the fan and work your way back to the relay. Might want to tap on the relay a little to make sure the new one didn't get shorted out by bad wireing somewhere else.
There is also a “cooling fan timer” located inside the vehicle in the driver sideof the dash. This is going to be much harder to diagnose….and I am notsure how expensive a guess that will be to replace. If the relay doesnot solve the problem, I would call your local Honda dealerparts department and tell them your problem and see what they say. Theyshould know which parts fail the most and what they sell the most of.
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