The heater and A/c fan gets power via fuse F8 (30A) and relay T8, both in the engine compartment fuse box and fuse 31 (7.5A) in the dashboard fuse box.
The ECU that controls the climate control also needs power from fuse 39 (10A) and possibly fuse 49 (7.5A), both in the dashboard fuse box.
If all 4 fuses are OK, check if relay T8 clicks when you switch the ignition on. There should be a diagram moulded into the back of the battery cover to show which relay is T8.