Coolant tank leaking only one driven hard

[michael_J_brown]

I drove the car to work today (about 10 miles each way) with the A/C running. I've removed the carpet and foam trunk liner and placed a towel under the coolant tank. I was very gentle and as far as I can tell not a drop of coolant leaked in the trunk or on the towel.

If I drive the car aggressively and rev the engine is when I experience coolant loss. It's obviously a pressure issue and I'm really wondering if a seal has failed. I checked the coolant cap and removed the plastic shroud that's at the top of the coolant tank and there are no signs of a leak.

When the leak happens I can't locate coolant on the back of the tank either so I'm not sure the tank has cracked on the back.

Is there a seal at the bottom of the tank?

I just hate to go through the expense and time of replacing the entire coolant tank if it's not necessary.