My blower motor on my 1999 grand prix gt only works intermittently. I replaced the blower motor resistor, and the blower motor.

The resistor was in a thousand pieces when I took it out, and the motor had a resistance of 0.

After replacing both things, it worked great for about 500 miles. Then today, It stopped working again.

The ac compressor is fine, because when I change the dial from off-5, I can hear it kick in from the engine.

What else could it be? A short somewhere?