My heater blower has been putzing out on me... seems to happen only when I use the auto switch control. If I use only the slow or fast setting buttons, the blower keeps working. After some time operating on the auto setting, however, the blower stops blowing. If I turn off the car and wait for about 10 minutes, the blower starts back up again on ignition.

Any ideas on this? What should I check? My guess is that there's a relay on the fritz. Where's the relay located? What's the part called? How much is to replace?