1. Open the fuse box cover located on the driver's side of the dashboard.
2. Locate the fuse labeled "Heater" or "HVAC". It should be a 15-amp fuse.
3. Use a fuse puller to remove the old fuse.
4. Insert a new 15-amp fuse into the slot.
5. Close the fuse box cover.
If the new fuse blows immediately after you replace it, there may be a problem with the heater itself or the wiring. In this case, it is best to have the vehicle inspected by a qualified mechanic.