I have a mysterious coolant leak that show up when tempertures drop to the mid 50's. Once tempertures are back up to 60's it does not leak. It happens overnight when tempertures drop. A table sppon or so leaks out some where around the timing cover.

I'm thinking there may be a crack in the timing cover somewhere and the crack opens some when cold and closes tight when hot. There are no leaks while driving it and during the spring and summer months. I have not had to add any fluid during the summer.

Strange. Any one have something like this before.