There could be several reasons for this problem. There could be a blown fuse, faulty switch or blower motor or resistor unit. You could go to a Suzuki or import car specialist or an auto electric shop.
If you want to find a specialist, here's a directory link for you:
...ouldn't come on, and the outside temp guage read ---- . I dont' know if maybe it's a fuse, or the blower motor (althought I don't know why that would affect the outside temp guage or the seat heater)....