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Temp gauge quit working
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pushkick
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Joined: August 09, 2007
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PostPosted: Sun Apr 30, 2017 6:04 pm    Post subject: Temp gauge quit working Reply with quote

havent found much data on the coolant temp sensor for the gsuge display and blinking light. what is the test procedure for the gauge if you dont have a vw tool what voltage or resistance ? i have searched threads but have no found no conclusive info. how to test temp sensor for failure? how to test gauge and wires from sensor? is there a circuit diagram in bently i have not found it.
any help is appreciated.
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Ahwahnee
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PostPosted: Sun Apr 30, 2017 6:11 pm    Post subject: Re: temp guage quit working Reply with quote

Here is the thread you need:

https://www.thesamba.com/vw/forum/viewtopic.php?t=464113
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pushkick
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PostPosted: Sun Apr 30, 2017 8:10 pm    Post subject: Re: temp guage quit working Reply with quote

Ahwahnee your post is greatly appreciated thanks , that is a great thread with a lot of good info, it looks like the temp gauge sensor is a rtd temperature device and not a thermocouple, so the resistance goes down or varies inversely as temp goes up. this means there is a constant current and the voltage varies as the resistance changes with temp. rtd's have a very linear relationship between resistance and temperature so only two measurements at different temps should be needed to check calibration.
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