QuestionHello and thank you in advance for any help you might provide.My question is about the circuitry of the water expansion tank sensor. I am using an expansion tank from a VW Passat year 1993 which is also found in various models from VW Jetta is another of them. The tank is round with an output facing side ways on the top and one in the bottom in an ''L'' shape about 3/8''. It has an intergal level sensor with two prongs. I cannot find any kind of continuity with or without water in it. I have tried with continuity tester , I applied power to it again with and without water and it seems that there must be something else to make it work. I have purchased 4 tanks so far for a project and all of them do not respond to anything I have done to them. I do not think that they are all faulty.
Today I visited the VW dealer which he told me that the tank is not so sofisticated and that the water makes the closed loop. Fine, I would love to beleive that but so far it is not happening. Have you heard anything about this? The tank is a Meyle which fits perfect for my projects and I would definately like to use the sensor if that is possible.Somebody had mentioned that it is some kind of magnet in the tank. I do not have the socket either that fits it and maybe that is another think that I might need in order to make it work. The following number is 1H0121407A Meyle
Expansion Tank/Coolant Reservoir; With Integral Level Sensor
AnswerHi Toli,
The sensor has a minimum voltage requirement. A nine-volt Ohm meter probably doesn't have enough amps to power the system. Also, the sensor on that tank is in communications with a CVR (Constant Variable Resistor) behind the dash so in order to use that sensor, the way it was designed, you need to have the instrument cluster from the donor vehicle and probably most of the wiring harness.
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Thanks for the question, I hope this information was helpful to you.
Fred
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