In this situation, the driver is still driving it daily to work. Looking to repair it in one day. If it’s a head gasket, probably can get it done in one day. If there is a cracked or warped head or block, we’d be out of luck.
What if, on the off chance, since it has not been diagnosed, if you install the other engine and it still overheats since you don;t know what the problem is? Essentially, since yall are not diagnosing it, you are just throwing parts at it. People rarely fix cars in that way.
