it could be engine coolant, which is also orange. Can I add that stop leak stuff? Will it work? Engine coolant stop leak can and does stop small leaks, but it is a shortsighted solution.

“Normal” may be a little higher than that in really hot weather with the air conditioning on, in stop-and-go driving ... (which could allow coolant to leak into the engine’s cylinders ...

However, it’s important to make sure that you fully understand where the leak in your radiator is coming from before attempting a DIY solution. The best way to stop your radiator leaking is to find ...