fan not working
 

does anyone know what fuse i should check first,its a 1998 civic.

Which fan? There are three:

Radiator fan
A/C condenser fan
HVAC blower (inside the car)

Fuses for the first two and I think also the blower are in the fuse box under the hood next to the battery. But the problem is usually something else.

Radiator fan: Unplug the thermo switch on the thermostat housing (where the lower radiator hose meets the engine) and jumper the pins on the car side. The fan should now start immediately when you turn the key on. If it does not, check the motor, fuse, and relay. If it does, test drive with it running all the time and confirm no overheating. If the engine stays normal with the fan running all the time, the thermo switch must be the problem, replace it.

HVAC blower. Usually the problem is the power transistor. Find the motor under the dash on the far right side. It has two rather heavy wires plugged into it. Turn key on and blower dial on high. Measure the voltage from each wire to ground (with the motor still plugged in):
12 volts on both: power transistor or control panel (almost always the transistor)
12 volts on one, near zero on the other: motor is bad.
near zero on both: No power from the fuse box under the hood, check fuse and relay.
The power transistor is mounted in the duct after the fan, it can be reached by taking the glove compartment off of its hinge (unscrew the hinge bolts at the bottom).

mk saves this site from being hopeless.

36 more posts before you hit 10K!

fixed.