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Old 12-21-2004, 09:20 AM
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Thermal Switches

How do thermal switches on the engine to detect the heat of your radiator coolant.

thanks in advance

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Old 12-21-2004, 01:20 PM
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HEY DREAD:

If I understand your question right the answer would be that the sensor has to be in the coolant flow. It will only react to the temperature, hotter or cooler that it senses. A temperature switch has a bimetalic ( two different metals) lever that changes position with temperature rise or fall. They can be made Normally Open or Normally Closed depending upon the function desired. The sensor may not be the exact same temperature of the coolant in the radiator or other part of system but may represent a repeatable value that will operate the switch in a satisfactory window. I hope this helps some what answer your question....DAVE
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Old 12-21-2004, 02:03 PM
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Some are operated based on energy resistance due to increased heat. A thermistor is what they are called I believe. They have a reference voltage sent to them, and then temperature is calculated based on the voltage sent back to the source. As far as I understand it, the more heat there is, the more resistance there is in the wire, thus the more heat, the less voltage that is returned.
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Old 12-23-2004, 11:05 PM
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and if i understand this right then the less voltage sent back will reduce the flow of fuel in the ecm. So if you could hook up a potemeotor to it then you could adjust the amount of fuel the engine gets. Am I right or wrong on that one?
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Old 12-23-2004, 11:32 PM
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Quote:
Originally posted by Dreadlord
and if i understand this right then the less voltage sent back will reduce the flow of fuel in the ecm. So if you could hook up a potemeotor to it then you could adjust the amount of fuel the engine gets. Am I right or wrong on that one?
You can hook a variable resistor between the sensor wire to ground if it is a one wire sensor or between the input and output wires if it is a two or three wire sensor(ie TPS). Good luck on the touch screen
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Old 12-24-2004, 02:21 AM
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Normally it only affects fuel in open loop mode. Once the engine is up to operating temp and goes into closed loop mode its taking readings off incoming air vs. what the oxygen sensor is seeing. While it does play a role there is more to the fuel mapping than the coolant sensor. However . . . especially upon startup, a misfunctioning CTS can cause it to run poorly.
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