I have a 2002 Nissan Altima 2.5 and there is a sensor mounted on the radiator support bar. Want to know what it is.

can you sort of describe what you are referring to?

It is mounted on the driver side of the radiator support bar and it is attached to a bracket. I'm thinking it could most likely be some kind of air sensor.... I'm not suite what it is.

It may not be a sensor. What you describe may be th horn. There is one sure- fire way to find out, have somebody blow the horn with your finger on the device WITH THE ENGINE OFF FOR SAFETY, or better yet you bloe the horn with the help. The sensor for turning on and off the fan is the temperature gauge, the fan does not run all the time, only when there is not enough air flow through the radiator.Is this it?

i'm going to add 2 photos first thing in the morning. One will be of the "sensor" in place and the other of the "sensor" itself.

Okay, here is the picture. It is located on the radiator support bar, driver side.

JJ, not ignoring you. Had personal issues and was not home for 4 days. Let me work on it, right now I have no clue.looking at that. picture, but it is exactly what I needed

Thanks.... I appreciate your help and any info you may run across.

ok go to.....http://www.best- deal.com/search/landing/query/altima+sensor/s/google/koid/6852177234/gkaid/1 00748872/adid/40.....and there are lots of images there. Pick out the one that looks most like it..OR, is it this?

Okay, thanks for your help. I'm going to go check that site out.