| You don't need to remove anything from the AC or heating system. I just did it without removing anything except the ECU cover. It's actually pretty simple if the engine is out. I've never done it with the engine in.. but if the engine was in and the turbos were removed.. that could give you more room to work. If you are going to replace it, I used the depinning method that some people mentioned on here. When it comes time to do that, search around or post and someone will help.
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