The upper tank on my '91 Civic Si radiator has a split 1" - 2" long immediately above one of the two brackets that support the air intake horn - the one closest to the battery. (And, no - I haven't leaned on the air horn in the past, though that kind of pressure is what causes the split to widen.) Realistically, is this repairable by a radiator shop? The tank is made of rather thin metal (brass?; aluminum?). I wonder whether soldering or brazing would work. I suspect that the shop might suggest the replacement of the tank. The alternative is 6 for a new radiator! I intend to keep the car for some time. Thanks.