Will an e46 radiator fit an e36?

No, an E46 radiator will not fit an E36 without modifications. The two models have different dimensions and mounting points, as well as variations in hose connections. If you want to use an E46 radiator in an E36, you would need to adapt the mounting brackets and possibly modify the cooling hoses. It's generally recommended to use a radiator designed specifically for the E36 to ensure proper fit and function.