I took cooper (2005 r53) to the shop as I had been leaking coolant. They could only find a bloated bleeder screw and chocked the rest up to air in the system. I can forgive this as it only seems to leak when stopped/turned off. It was also running hot upon idle and it still is using coolant (duh, its leaking out somewhere). It appears to be leaking somewhere up front. I think it may be dripping into the shield and falling from there.

Here is a short list of items that have been replaced that may be relevant:
Thermostat (not housing) 3 years
Water Pump 2 years
Radiator fan 6 months

Not sure what else to say as I am just wondering where I should look before I start buying parts. I did see a video and the person had the same issue. He is adamant that it is the radiator.

Any help would be appreciated. Thanks in advance

 

If your radiator is original, it is the most likely culprit.

 

Just because a component has been replaced already doesn't rule it out as the failure point.

Have a proper diagnostic done as it could be anything from:
Radiator
Water Pump
O-ring on the water pump neck
Hose
Thermostat
Oil cooler rubber lines
Oil cooler steel lines

The top 4 will be the most prominent if the leak is on the front of the engine, but a thermostat leak if bad enough can migrate down the front of the block as well as the back.

 

When you have some time and won't need the car for a day or so, remove the underbody belly pan, or even better - the entire bumper.

Run the engine for a while, watching to see if fluid leaks from the radiator, hoses or elsewhere on the front half of engine. If it isn't leaking when the car is running, shut the car off and wait overnight to see exactly where the drips are on the floor. If it's the radiator or hoses, there will be nothing stopping the drips from hitting the floor directly below the point they originate from.

 

It sounds like the O ring from the water pump to the block. They leak and run down the front of the engine but are very hard to see because of the SC and intake.

 

Chris is probably right. If it's leaking after cooling down, wait 'til it's cooled down, then pressurize the system to about 20-25 lb. You may be able to then confirm the source of the leak.