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.

[JFP in PA]

Originally Posted by 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.

Then pressure test it, that will tell you if it is tight or not in about 15min.