So I had to put my '11 outside over night and it was was - 13 degrees. Now I developed a radiator leak in 2 places. It only leaks when car is running. Can't pinpoint yet where its leaking from. LT with 97,000 miles. Car is normally garage kept and is very clean condition ( no rust ). Coolant did not freeze so I not sure where to look

 

Check the clamps at there are 4 on the upper hose, and 2 on the lower hose.
check the rad cap filler tee. For cracks, loose cap.

 

From the radiator for sure? The washer pump is known to freeze and fail.

 

How old is the coolant? It may not have frozen in the filler neck or hoses, but maybe did in the tiny radiator passages (if the coolant is old, that is).

 

Thanks for the ideas

 

There are compounds that eliminate small radiator leaks.
If the radiator itself is damaged, you can use this.
Many years ago I used this as a temporary measure while a new radiator I ordered was on its way to me. As a result, the new radiator not only arrived, but also waited for its turn for more than three years.
By the way, the chemistry was American, called Hi-Gear, a lilac tin can..

 

Back in the day household black pepper. Can u still do that with newer cars?

 

I wouldn’t, might clog up the heater core! And we know changing that heater core is a huge PITA!

 

I ordered a new radiator. Thanks for the help

 

You are sure it’s a leaking rad?