It seems that my car is leaking coolant, but only after the car is shut off and sits for a while. I've ran the car, and it doesn't leak at all. I park the car over night, and there is a small puddle.

If the car sits for a while, there is no puddle, but if I start it, run it till warm, and then let it sit all night, it'll leak.


The puddle is under the radiator....and I've searched the entire thing for the leak, everything looks good.

Any suggestions?

 

i would suggest looking over your hoses to make sure they are all tight, and if anything, just run the car and turn it off and just sit there until it starts leaking.

 

Probably leaking from the drain plug or on the side of the radiator where the plastic meets the aluminum.

 

It's an aftermarket aluminum radiator. I was debating on pressure testing, but sounds useless considering it doesnt leak when running and hot....only after I park the car for a few hours.

No leak from drain plug, cap, reservior, or any of the hoses.