How to replace a heater fan motor for a 1992 honda accord?

Check the heater blower fuse and heateer blower relay, located in the under hood fuse/relay box, first.

What's wrong when you turn on your car and the fan works cut off let sit turn on again anf fan doesn't work but you can feel the heat coming out of the vent?

Check the relay, referenced above.

Already did both good,what's next

How did you test the relay?

Honda blower fan motors are very reliable--I've never seen a bad one. I would begin by disconnecting the negative battery terminal, removing the heater blower relay and cleaning contacts with abrasive cloth. I would also remove and clean the contacts going to the heater blower fuse. Finally, I would clean the connector going to the heater blower motor. Apply dielectric grease to all connections; otherwise, spray contacts with WD-40.

If the problem persists, I would thoroughly test/replace the relay before replacing the blower motor. You can test the blower motor itself by hooking up a fused jumper wire directly between the positive battery terminal and the blower motor.

If you decide to remove and replace the blower motor:

. Disconnect the negative battery cable.

. Disable the air bag, if equipped.

. Disconnect the electrical connector from the blower motor, which should be located under the dash, behind the glovebox.

. Remove the three mounting screws and remove the blower motor.

. Separate the blower motor from the fan wheel and place the fan on the blower motor.

. Botton things up.