New car to us...... The fuse that controls the A/C and rear defroster blew. No problems until the weather cooled and my daughter had to use the defroster. Inserted a new fuse yesterday, and within 10 min or so, it blew again.
Now we have narrowed it I THINK, what might cause this? Or am I destined to take it to a shop and have a lot of diagnostic time?
OR anything else we can look at first?
thanks
Right sized fuse? Power (full 12 volts) at the grid when turned on? If not, you have a short in the wire to the grid. There is NOTHING that will make a rear defroster grid draw more current than spec. A bad (weak clip) fuse holder will overheat and blow fuses .
Trace the power wire from the back window to the switch and you will find your problem. assuming you are using the correct fuse. It should be easy to locate, I would guess it would be found around the rear seat area.
Glenn Beasley Chrysler Tech
on older neons,ive found pinched loom under rad.support,in center,caused by bottom out in front
I dont think that would have anything to do with the rear window defroster under the radiator
I would look for a bare or worn wire lead from the grid probably touching the bodywork close to the rear window. It is possible for the grid to draw more amps depending on the silver mixture applied. OEM parts all have to meet a certain spec in this regard. Aftermarket parts do not have to meet nearly the same standard.
The fuse is a size 10, which is what the fusebox calls for. I'll start checking wires.
Thanks for the replies.
A 10? My rear defroster uses a 20 amp. Are you sure your looking at the right fuse number on the cover for the fuse box?
Hmmm, what fuse ARE YOU talking about? give me a number because the fuse that protects the rear defogger is a 40 amp fuse located under the hood in the PDC. If you are referring to fuse number 7 10 amp fuse in the fuse box you may have problems because it protects the circuits If equipped.....
rear window defogger a/c cycling switch passenger power window switch back up lamp switch Park neutral position switch (is this a manual transmission?) Brake shift interlock solennoid Instument cluster
The 10 amp fuse in under the dash is the one blowing.
A/C equipped Rear Defogger no power windows auto trans
Disconnect each circuit untill you find the one that isnt blowing the fuse, as I said, more then likely it is the feed wire going to the window grid from the switch to the grid.
Good luck
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