90 4Runner heater problem

Dear Jay,
You say the heater and a/c doesn't work I'am assuming the fan motor is what you mean. Recheck the fuse for the fan motor and make sure it is good. If it is good check that power is getting to the fan motor with a volt meter or 12volt test lamp. If the fuse is good and you still have on power you need to check the fusible link. ( This is different from a fuse but works in a similar manner). I not sure where your model has it but here are two places to check. Sometimes it can be located under the hood in a box. Similar to a fuse box and it will be maked. The other location is right off the postive terminal of the battery. This will look like a bunch of wires ( like a wiring harness) and will be a little harder to tell which one is blown. If it is blown the link will feel soft in the location that it is blown and may be discolored. If the link is blown you probably have a short and will need to address that first before replacing it or you may just need to replace it again.