Until you can get to it, I suggest wrapping over the hole w/ silicone self-fusing tape (any hardware store). I have done that for axle boots and ball joints. That could even be a permanent solution, but suggesting that would set some people off here.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans