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Engine Specific Info and Questions => IDI Engine => Topic started by: 92EcoDiesel Jetta on August 11, 2011, 02:27:46 pm
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This is the 4 terminal brown switch on the flange at the end of the head under the camshaft lock slot. The metal sheath, which is copper with a coating (looks like tin) has been mostly eaten away and is has a slow leak via the o-ring. It was covered in this blue crusty deposit which I scraped away before I took this pic. The color looks like copper sulfate. I soaked the switch in Citric acid and it softens the deposit to a soft mud (both in color and consistancy) which can be easily washed off with a tooth brush and water. What's the cause of this corrosion? Wrong coolant?
(http://i1183.photobucket.com/albums/x480/Ecodiesel92/Photo_072811_001.jpg)
You can see the corrosion buidlup better in this flange pix.
(http://i1183.photobucket.com/albums/x480/Ecodiesel92/1313096214.jpg)