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Plugging the lines is a definite option. I plugged my '89 W124 even though I live in a cold climate. The heated line from the reservoir had split years ago and I replaced it with regular WW hose (new hose is over $100) so I felt that the fluid would have cooled off by the time it reached the nozzles.
These are the plugs that I made. Overkill but it gave me an excuse to play with my mini lathe.
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