Brake light switch stuck.
From what is sounds like, your brake lights constantly appear to be on. It's not uncommon for aftermarket parts, such as brake light switches (https://www.yourmechanic.com/services/brake-light-switch-replacement), to fail prematurely. I would have a certified mechanic like YourMechanic verify the problem (https://www.yourmechanic.com/services/brake-light-is-not-working-inspection)...
I just put in a new [radiator](/topics-radiator-cadillac/) and it blew the cooler line out of the radiator at the quick coupler Mechanic's Assistant: How many miles are on the car? Has any work ever been done on the radiat...
I just put in a new [radiator](/topics-radiator-cadillac/) and it blew the cooler line out of the radiator at the quick coupler Mechanic's Assistant: How many miles are on the car? Has any work ever been done on the radiator? Not prior to me putting new one in and it has 172000 Mechanic's Assistant: What is the make/model/year of your car? 03 cadillac [cts](/topics-cts/) Mechanic's Assistant: Are you fixing your CTS yourself? What have you tried so far? Yes I fix it myself and this is the first time it's popped the hose Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? No that should be it