Hi trueog,

Highly recommended that you bring along a Flashlight/Torchlight as well.
The crack on the radiator plastic ends are hairline cracks mind you, which is very difficult to detect.

Use the flashlight to shine on the sides of the radiator. You need to be patient to wait for the thermostat to open then only the coolant start to seep through the leak. However once the engine heats up the seeping coolant from the leak will evaporate due to the engine heat. So the timing must be right......

It took me quite a while to detect the leak on my radiator as the crack was not obvious at first ...but the crack grew bigger due to time....That is when I notice the coolant seeping out...

Be extra careful of the radiator fan though while you are at it....

Happy observing.

Cheers.