If there is still a leak in the cooling system, we need to determine what is causing it. Also, if you haven't already, make sure the coolant level is full.
A leak can be a radiator hose, heater hose, water pump, and so on. Since the radiator is new, we can assume that isn't the issue.
To start, take a look through this link and let me know if it helps:
If that doesn't help, we need to pressure test the system. This is done with the engine cold so you can move things around easily. Here is a link that shows how it's done:
Now, you will need a pressure tester, but most parts stores will lend one to you,
Let me know what you find or if you have other questions. Also, let me know if you notice the leak from the front of the engine compartment or rear.
Wednesday, September 1st, 2021 AT 8:45 PM