I have a rusted old air handler. It has no name on it and I can find no results for the model number listed above. I need to figure out what type relay to get and where to get it. The unit kicks on with no issue but at times the thermostat turns it off but the blower keeps going. I can tap the unit where the relay is and it shuts off. I pulled the relay and cleaned the posts but the problem continues. The relay itself no longer has any markings so I can't find a cross reference. Any Ideas?