I was on the freeway today and the little light that looks like a car with a lock going through it came on. I checked my manual but couldn't find an explanation. It seemed about the same time my AC quit working. When I got to my destination before I shut down I checked under the hood and sure enough the AC clutch was not engaged. Coincidence?


I shut the truck down, attended my appointment and upon restart the light was gone and AC worked. Any thoughts?

I think that symbol is for vehicle security.Also on a/c it could be the low pressure cycling switch or possible the wiring harness that is under the upper dash panel being pulled at the connector,I saw a bulletin on the harness and I have replaced a barrel full of switches gone bad.

That is the security light. It indicates a problem with either the vehicle theft deterent system or the content theft deterent system. There will be a code stored.


It's not related to the A/C system. If your A/C is on and the clutch is not engaged tap on the low pressure switch on the accumulator (aluminum canister on pass. side of engine compartment). The switch fails often.

Thanks guys!

We think alike and only one minute apart!http://www.dieselplace.com/forum/smileys/Thumbs Up.gif

Guess you have replaced a few of them too?http://www.dieselplace.com/forum/smileys/Big Smile.gif