First check the relays and fuses. If they're good, then you can test your coolant temp switch or probe the fans for voltage.
If you're not familiar with this procedure, then I don't recommend you do this yourself, as you can do some damage.
Instead, go to your local community college and find a student of the automotive program. They'll certainly do this for a lot cheaper than a shop.
Monday, February 8th, 2010 AT 8:45 PM