I'm at my wits end trying to figure out why my coolant is evaporating from my radiator, causing me to overheat constantly. My radiator is new. The cap is good. There are no leaks. Nothing in the oil and nothing in the exhaust. An entire gallon of coolant will be gone in less than 48 hours. No codes are coming up in diagnostics. Has anyone else experienced this? Granted, this car is just about 13 years old but I've had minimal problems with it. Any helpful suggestions/advice would be very helpful. Thanks!

 

Did this just start happening from the radiator change or before? If you are losing a gallon of antifreeze, there's definitely a leak... What caused you to change the radiator? Did you bleed the system properly after installing?

I recommend you pressure test the coolant system. If it can't hold pressure, that will confirm a leak. Hopefully the head gasket isn't blown