A/C fan high speed

On these vehicles (95 3.8), the high speed mode for the fan has its own relay & circuit. My high speed stopped working and right away I found the fried resistor wire. And replaced that and then found the fried relay. I replaced that and everything worked fine. For about two weeks. Now the relay is fried again. Possibly from fried contacts in the relay wire socket.
Any ideas as to the root cause?

I would bet your blower motor is going bad, drawing too many amps and frying your resistor and relay.