fan runs constantly

the a/c auto amp is bad and needs replacing.

some people will tell you that the blower motor resistor is bad but since yours is an auto A/C system it does not use a resistor

Thanks. When I saw your note, I decided that I'd let my dealer do it because I'd probably have to buy the part there anyway. Their diagnosis was a bit different. They tell me that I need a new control unit and a "sun load sensor". They couldn't do the repair today because they didn't have the parts on hand. The estimate is $900!!!

Sooooo, now I'm thinking I'll try to do this myself. Where on the car will I find the a/c auto amp. Is it a plug in part similar to a relay?

The reason they told you that the sun load sensor was bad is because the put the auto A/C system into self diagnosis and read the codes.

All auto A/C systems will display a fault with the sun load sensor is the diagnosis is done under a roof.

The A/C auto amp is located just behind the blower motor

I ordered the part and it arrived today. I have removed the glove compartment and the blower motor. I can't find the amp anywhere. I've looked behind the motor, but I don't see anything that resembles the part that I have. Do I need to remove the blower housing?

Thanks for the help.

I should add that I also checked Alldata. Their diagrams show the a/c amp in two locations in the center of the dash, depending on whether or not you have the navigation system. I don't. The amp is not in either of the locations indicated. Google searches and the forums on edmunds.com didn't have any location information either.