coolant/engine/water temp sensor questions - PeachParts Mercedes-Benz Forum

sjsfiji · #1 05-17-2004, 01:12 AM

Hi All,

Can someone briefly explain what each of these sensors do and where they're at. My aux fan is running on 'HIGH' at all times and need to find the cause.

One more thing, where is the RESISTOR that supposedly causes the aux fan to run on 'LOW' until one of these sensors is tripped.

thanks,

sjsfiji · #2 05-17-2004, 01:30 AM

Please disregard the coolant "temp" sensor... it's a "level" sensor...

wjm · #3 05-17-2004, 07:31 AM

Quote:

Please disregard the coolant "temp" sensor... it's a "level" sensor...

The CTS is what measures the coolent temperature and kicks off the fans at HIGH speed when needed. It's not a level sensor. Might also be known as the water temp sensor. Actually, my CTS looks exactly like what the "A/C ACC Temp Sensor" looks like for your car.

Do a search on "sensor" in fastlane for your vehicle. You'll see pictures of most all of the sensors in your vehicle.

sjsfiji · #4 05-17-2004, 12:31 PM

thanks,

I made a mistake in including the coolant 'temp' sensor in my orig post which was actually a 'level' sensor... hence my reply.

The CTS you're referring to is called "Engine temp sensor" in fastlane. There is also a "water temp sensor" in Fastlane which has only one 2-wire connector. Do you know what that's for?

thanks,