I would at least put some paper towel in the holes to keep bugs from crawling in....may not be a problem in Denver right now, but here in Austin it's in the 70's.

I just replaced mine on the SD and had no problems with the fluid filling the system.

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1998 W202 C230 - The money pit of late.
1984 W126 300SD (356,800 miles) Gone to the wrenchapart
1984 W123 300D Gone to the wrenchapart
1972 W108 280SE 3.5 (sold but not forgotten)
1986 Buick Grand National 3.8l Turbo (86k miles)
1966 Glassic Model 'A' Replica http://www.glassicannex.org

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