[onfootfilms]

Hey Mike, I'm not sure if it's the same problem or not, but my '05 colorado had the heater fan making a strange noise and pretty soon it only worked on high. After a second trip to the dealer I discovered that there is a wiring connection under the dash above where the passengers toes usually are. Good place for a connection. Anyway, this was loose and you could see the plastic was turning color from the loose connection. The dealer replaced the connector and it solved the problem. Might be something totally different but if it quits working at some speeds, keep that in mind. Joe