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Back up light switch replacement


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I replaced the back up switch yesterday, followed the excellent DIY posted by dphil66 and did not have any problems.

I noticed that when I removed the switch a vaccum had built up in the transmission case, is this normal. No sign of any oil leaks.

Car is a 99C2 6 speed

Thanks

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I also replaced my backup switch (MY99 C2)using the same excellent reference with no spill of fluid. I was concerned going into the procedure based on other post that some fluid would spill out. I took out the old piece and was ready to put in the new unit but there was no fluid coming out. I'm not sure what you mean by a vacum effect? Bottom line I think you are fine.

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When I unscrewed the switch about half way I could hear air being sucked into the transmission around the thread. sometimes you get the same thing when filling a gas tank but i have never had it happen when checking transmission oil levels. I cant work out why or how a vacuum would be created in a sealed transmission case.

No leaks anywhere.

Edited by rattles
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I don't think it is a vacuum your hearing but pressure that builds up in the gear case. Transaxles have a vent that sometimes gets plugged and causes this problem, it can lead to leaks as the pressure will push the fluid past seals and such. I've no idea where the vent is located on your car...... Loren or Toolpants hopefully can help out.

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