![]() ![]() There two common different types of coolant switch. What are the two types of coolant level switch? Switches are often provided by the engine and/or manufacture, rather than the generator manufacturer as a standard protection device. Engine manufactures or radiator manufacturers determine what the level of coolant is appropriate and when the engine should be shut down to prevent problems or catastrophic failure. Traditionally a coolant level switch is closed to earth on fault (when coolant level is low) and open when the coolant temperature is below this minimum requirement. Normally screwed into the radiator header tank, it has two states, either open or closed. What is a coolant level switch?Ī coolant level switch is an on radiator protection device that is used to monitor the coolant level in the engine cooling system. Commonly coolant temperature is also measured separately, by either a coolant temperature switch or a coolant temperature sender. The coolant level is normally monitored by either a switch mounted in the radiator. In generator protections, a low coolant level alarm is used to alert the operator to the engine suffering from coolant level. What is a coolant level switch? How is it used to monitor coolant level? Why is it useful? How can I check the level switch? What is an oil pressure switch? How is it used to monitor low oil pressure alarm monitored? Why is it useful? How can I check the oil pressure switch?.What is an oil pressure sender? How is it used to monitor low oil pressure? Why is it useful? How can I check the oil pressure sender?.What is a coolant temperature sender? How is it used to monitor engine coolant temperature? Why is it useful? How can I check the engine coolant temperature sender?. ![]() What is a coolant temperature switch? How is it used to monitor coolant temperature? Why is it useful? How can I check the coolant temperature switch?.What is a coolant level switch? How is it used to monitor coolant level? Why is it useful? How can I check the level switch?.What is an oil pressure switch? What does it look like? How does it work?.What is an Oil Pressure Sensor? How to test an oil pressure sensor?.What is an oil pressure sender? How does it work? What is it used For?.What is a combination oil pressure switch and oil pressure sender? How is it used?.It must be filled up to or just above the big seam in the middle of the reservoir to for the coolant level sensor to close. Obviously, make sure enough coolant is in the reservoir. The coolant level sensor is closed (0 resistance) when the coolant reservoir is sufficiently filled and open (infinite resistance) when the coolant level is low. You could also perform a resistance test on the coolant level sensor. Likewise, you should also see 12VDC if you probe the yellow/black stripe wire and a +12V source such as the jump start post on the UHFB with the engine running. This should yield a reading of at least 12VDC. If you don't get anything, try probing the pink/black stripe and a good ground to bypass the BCM. ![]() You should get a reading at or above 12VDC (closer to 14VDC with the engine running). How are you measuring the voltage? Are you just probing the two wires at the coolant level sensor? If so, first make sure the key is in the RUN position and try again. It is only hot when the POWERTRAIN relay (slot 29 in UHFB) is closed which should occur whenever the key is in the RUN position. The 15A EMISS fuse is #10 in the underhood fuse block and also provides power to the oxygen sensor both heaters, MAF sensor, and canister purge solenoid. Shorting the connector sends 12v to the bcm to leave the coolant light off, an open circuit turns on the indicator or lack of 12v sent to the bcm. The body control module uses sensors before turning on indicators. I'm going by '05 wiring and presume the low coolant sensor circuit remains the same with the following remarks the pink/black stripe wire has 12 volts from a 15 amp EMISS fuse with the yellow/black stripe wire returning to the bcm (ground). ![]()
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