This was my first attempt of posting a picture on this forum. On my 2002 TJ 4.0 with auto trans I had my battery out so I thought I'd remove the battery tray to scrub it down and repaint. There is a hole in the middle of the tray with a flat plastic gizmo fitted to it with two wires attached to it. Or should I say there was because I broke it. I don't see it anywhere in my Chilton book. Does anybody know what this is?
Also, underneath the tray is a triangular looking plastic thing. I'm assuming that is the vacuum canister I've heard other people refer to? Thanks for any advice you can give.
I put a vacuum pump on the canister and it held vacuum so I reconnected it. I got the temp sensor from Advance Auto Parts and put it all back together. The Jeep's running good. Thanks all for the info.
The vacuum line going to the canister was blocked off with a screw and there were no vacuum leaks. I drove it about 100 miles today after removing the screw and reconnecting the canister. I didn't notice any difference in how it ran which really makes me wonder why it was disconnected in the first place. Also, I have never owned a vehicle with a battery temperature switch and wonder if exploding batteries is something common to Jeeps.
That you have never noticed a battery temperature sensor doesn't mean they aren't commonly installed. Once again, it is there to prevent the alternator from overcharging the battery or charging it at two fast of a rate. All three of my vehicles have one.
The vacuum cannister is there so the HVAC controls can stay put as the engine vacuum level changes. What would cause engine problems is if the hose that connects the cannister to the engine were to be disconnected, causing a vacuum leak.
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