Heater fan randomly starts

[yellowmontana]

We have a 2008 Montana SV6 and the heater blower will run by itself when the engine is off for about 30 seconds then turns off. I didn't notice it during the winter but now that it's warmer the blower is running randomly again.

 

[melsg5]

Is the fan speed set for zero? Does it turn off when you open the drivers door? Is this vehicle a recent purchase?

 

[Zimgxp]

If it is running on high, check the blower relay.