Stuck cargo box lock.

I've never had this happen until today. It was tough to tell whether the lock cylinder or the locking mechanisms were frozen or if a ski was jamming up the locking mechanism. Regardless, the locks on either side of the box would not unlock. It did finally unlock when we stopped for a beer at lower elevation. So based on this, I'm leaning toward a frozen lock cylinder or mechanism. After getting home, I did spray all the moving parts with a silicon lubricant.

This is a Thule Cascade XT, probably purchased 7-8 years ago.

Has anybody else had this issue?

Yep. Thule Frontier. Get some de-icer and a lighter to heat the key if it needs it.

I loved my thule until this happened to me. Now I have a yakima box which has a lever, unlike the thule where the key attempts to move the frozen latch. Though the main problem was I let water get in the latches...which then froze at higher elevation. Hopefully I will remember to put my skis in quickly and not ever test whether the lever actually can break the ice on the frozen latches.

Yep, same brand same problem. It was on a very rainy day that turned to ice then snow as drove up. Thanks for reminding me to lube.

Not sure about the Thule, but my Yakima box cylinder is the exact same diameter as the cigarette lighter in my car. The few times my Yakima lock froze, I held my car lighter against the cylinder - thawed out and worked every time.

We tried using a lighter to heat the key and the cigarette lighter to heat the lock with no luck. We could insert the key into both cylinders but they wouldn't turn.

I had not thought of carrying deicer. It would work for the lock cylinder but would be tough to spray into the lock mechanism inside the box.