Got my car back from the dealership today after a PSE pump fix. I looked at the pump and apparently part of the fix now is to wrap the pump in a clear bag. I know this was discussed on other threads and it was stated that this could cause condensation to build up, but I guess MB doesn't care.
Should I go ahead and put a small hole in the bottom of the sealed bag or not?
I tried to pull out the unit to inspect the wiring and make sure they had performed the loop addition with a longer harness, but the bag was sealed and I didn't want to mess with newly completed work. According to the service print-out they did perform this harness extension/swap, but not sure what good that will do if the bottom "drain" holes on the pump are running right into a sealed bag.
If all the wires and hoses exit at the bottom of the bag you will be OK. The water that gets into the car will run down the cables and hoses and if the cables extend below the bag and turn up towards it, than the lowest point is the wires and hoses and the water will drip off from the lowest point where it loops back up as opposed to the original version where the hoses entered the pump from the top and allowed the water to fill the pump housing.
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After fresh thinking I put mine in a new plastic bag that I stuffed all the way into the hole where the cables/vacuum hose come from. Think this will stop the issue about water running down the cables, since the pump is higher than the hole. Will use it for a while and see.
If all the wires and hoses exit at the bottom of the bag you will be OK.
From what I can see, the entire pump and foam shield are covered, and the only opening is with wiring at the very top of the unit, which has tape/adhesive sealing the bag around the wiring bundle.
The TSB has them add the loop in wiring that allows for the "lowest point" drip that you mention, but it appears that if this loop does now exist, it's inside the sealed bag (which does me no good). I'll have to take a closer look at this mess when I get the chance, but as I mentioned in the above post what I don't want to happen is the removal of the unit to result in me screwing up the sealant fix Mercedes has just performed (even if it's relying on a sealed bag to keep the unit dry).
My understanding of the fix was to lengthen the lines so the unit could be mounted upside-down. That way the wires and pnuematic lines are coming out below the pump, and the circuit board is at the highest point. If they lengthened the lines but mounted the pump in the same orientation as it was, I think they did it wrong. As I recall, someone with a newer SLK (2004 maybe) checked and his came from the factory with the pump in the upside-down position.
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