Heat blower turns itself off

My fan will sometimes only blow on the highest setting. On lo or the two intermediate settings it will often not work or turn on and off by itself (stopped and driving)

Any ideas what might be going on?

Thanks

 

the blower motor resistor is bad. easy to replace. search the site for info on how to do it.

 

Not necessarily.....

Wiggle the connector on the blower resistor and see if it starts again. The connector has a tendency to have loose pins which will cause the fan to stop. If your fan changes by wiggling the connector, remove the connector and look inside. You may find a brown streak caused by heat of a bad connection, it's a common problem. Put a jewelers screwdriver or a dental tool inside the connector... with the truck OFF of course, and bend the pins out to make a better connection.

Read down and find my post on this:
http://www.toyotanation.com/forum/6...3-hvac-blower-motor-resistor-replacement.html

 

This happened on my 1st gen. The connector was burned pretty bad, so I had to go to a junk yard and find another connector off of a Camry. Once I replaced the connector the problem was fixed....