Different car, but I recently replaced my heater core and thought about replacing all the vacuum pods. I didn't do it because I was hemorrhaging money on the car and had to draw the line somewhere. Now, about four months later, one of the pods is leaking. I don't need to remove the dash to change this one, but I'm afraid the rest are going to go soon.

If you can swing it, replace them all. I don't know about the heater core on your model, but that might be something to consider as well.

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1987 W201 190D