I've replaced the radiator fan after an overheat, engine fan+fan clutch that failed shortly after and the radiator after the outlet neck broke off, all in about a couple week period. Coolant level and temp has been fine after all the replacements. I then had some tranny fluid added because I noticed some slipping after I had all the other stuff replaced which fixed that problem. After that, I drove the car really hard because I was afraid to do so while all this stuff was going on and I noticed that all the coolant in the reservoir was gone this morning. So basically I'm asking what would not leak under easy driving and then leak under hard driving. Reservoir went from full to empty in 1 day. I'm starting to really hate my car.