Maybe it's not the radiator. Maybe it is one of the radiator hoses that is leaking. Or possibly the radiator cap or a level sensor.
Where is it leaking? That pressure test sounds funny, why would you pressurize only the pump and radiator? If you are leaking coolant outside the engine, locate the source. If you are losing it from the radiator but cannot find a puddle suspect a head gasket problem. Check the Radiator cap first, if it is bad high pressure coolant will travel back to the overflow bottle.
Are you overheating? If so,you may have a radiator that is plugged and needs replaced. It may just be too old and is leaking still needing replaced.Third,if you have a head gasket blown,it can push the coolant out of the system.You would have to check the compression to find this problem,not a hard one to diagnose either.
It is best to consult a mechanic about something like this because if you drive with a broken radiator then you are at risk of damaging the entire engine. I would say if the radiator cracked during a car accident then it is best to get a new one. There could be hidden damage that you only see once the old one has been taken out. There are lots of reasons that a radiator would be leaking. Speak to a reputable mechanic about the best way to go. You must weigh the cost of repair against the cost of replacement vs. the benefit. If the damage is due to an accident, insurance will likely decide if the radiator needs replaced or if it can simply be repaired.
I've had this happen to me before. I had the water pump replaced after it had been leaking a little and my car overheated. We thought it might have been leaking again but turns out the mechanics had forgot to tighten something. I would have them look at it once more to make sure nothing is loose and leaking your coolant.
I would start with checking all the hose clamps and hoses to make sure they are properly tightened and not damaged. Also check that the thermostat housing is not leaking along with the water pump. Especially if any of these were replaced when the radiator was replaced. Also check to see if drain cock is closed. Also make sure the overflow hose is correctly routed to the overflow tank. You might just have to run the engine and open the hood and see where the leak is coming from. Good luck.
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