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I am not sure about an 89, but on my 93 E350 it is located on a pipe that runs from the compressor, up over the engine to the passenger side. The funny part is the valve "T's" off the pipe towards the side rather than the front(which would make it easier to access. Anyways just follow the pipe with your hand and you'll probably run right into the valve, in my case it wasn't very apparent just looking for it.
It is attached to the a/c dryer on the passenger side front fender well.
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∙ 14y ago
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