Trouble starting

I have a 2000 Saturn SL 1 and it takes about 20 minutes to get started and it started after the radiator was changed and I am losing coolant and I noticed a leak around the flex on the exhaust pipe could this be the starting problem?

Does temp matter? where are u losing coolant?how many kms?

After it sits for a while it has 177,000 the only place I see any fluid is around the flex pipe on the exhuast.