93 honda accord, automatic. The radiator fan is not coming on when engine gets hot.

If I turn on the air conditioner, both fans work.

If I disconnect the 2 pin thermoswitch and short the harness connectors, the fan does not work. However, If I leave the harness connectors shorted and turn the car off, the fan comes on (!?!), and immediately shuts off if I pull the short wire.

With the thermoswitch harness still shorted, Pulling the relay labeled "cooling fan" in the fuse box does nothing, no clicking. Replacing the relay with the one next to it (power window), which is same part number and nothing happens either.

Any thoughts???

Help?!

THanks,

Tony