Rear defroster
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Mountain Pass
Joined: Aug 2019
Posts: 140
Likes: 8
Rear defroster
Hi, all.
My rear defroster acts really weird, and I wonder if it's an issue with my truck, or just an undocumented functionality.
Sometimes the rear defroster won't turn on, but sometimes it turns on. It seems to be temperature-dependent, and fortunately in cooler weather like we are having now, it works every time.
Is this normal, or is my rear defroster going crazy?
Thanks.
My rear defroster acts really weird, and I wonder if it's an issue with my truck, or just an undocumented functionality.
Sometimes the rear defroster won't turn on, but sometimes it turns on. It seems to be temperature-dependent, and fortunately in cooler weather like we are having now, it works every time.
Is this normal, or is my rear defroster going crazy?
Thanks.
Trailering
Joined: Sep 2007
Posts: 16
Likes: 3
I had the same issue with mine - until it quit entirely.
From my diagnostics and research I found the problem is a loss of electrical continuity between the three glass panels that make up the sliding rear window. Unfortunately the fix is to replace the entire rear window assembly.
Remember: even though the rear defrost indicator will not come on and the rear defrost does not work, the side mirror defrosters will still work.
From my diagnostics and research I found the problem is a loss of electrical continuity between the three glass panels that make up the sliding rear window. Unfortunately the fix is to replace the entire rear window assembly.
Remember: even though the rear defrost indicator will not come on and the rear defrost does not work, the side mirror defrosters will still work.
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Mountain Pass
Joined: Aug 2019
Posts: 140
Likes: 8
Thanks -- makes sense that it requires continuity across the glass. I bet the more I work the rear window, the better it gets, since that wipes the contacts across one another and maybe cleans them a bit.
Tuned
Joined: Dec 2012
Posts: 432
Likes: 112
1st Gear
Joined: Jan 2023
Posts: 1
Likes: 0
From: Yorktown, VA
2018 Rear Defroster Issue
2018 F-150 Lariat, Super Crew Cab. 2 of the 3 rear window defroster quit working recently, and they're not covered under my Ford Extended Warranty Plan. I took it to my dealer here in VA and the mechanics "diagnosed" it as requiring replacement of both windows! Now, I've never stacked anything up in the back seat that would have contacted the defroster grids, and there are no broken wires visible. The fact two of the window defrosters quit at the same time leads me to believe it's a wiring connection problem, not something requiring window replacement. Fortunately the dealership agreed to cover it, but it still seems like overkill to me. Has anyone else had experience with rear defroster failure, and how did you fix it? Thanks for sharing your experience/mechanical know-how for this system.
Tuned
Joined: Dec 2012
Posts: 432
Likes: 112
2018 F-150 Lariat, Super Crew Cab. 2 of the 3 rear window defroster quit working recently, and they're not covered under my Ford Extended Warranty Plan. I took it to my dealer here in VA and the mechanics "diagnosed" it as requiring replacement of both windows! Now, I've never stacked anything up in the back seat that would have contacted the defroster grids, and there are no broken wires visible. The fact two of the window defrosters quit at the same time leads me to believe it's a wiring connection problem, not something requiring window replacement. Fortunately the dealership agreed to cover it, but it still seems like overkill to me. Has anyone else had experience with rear defroster failure, and how did you fix it? Thanks for sharing your experience/mechanical know-how for this system.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,509
Likes: 116
From: St James, Missouri
2018 F-150 Lariat, Super Crew Cab. 2 of the 3 rear window defroster quit working recently, and they're not covered under my Ford Extended Warranty Plan. I took it to my dealer here in VA and the mechanics "diagnosed" it as requiring replacement of both windows! Now, I've never stacked anything up in the back seat that would have contacted the defroster grids, and there are no broken wires visible. The fact two of the window defrosters quit at the same time leads me to believe it's a wiring connection problem, not something requiring window replacement. Fortunately the dealership agreed to cover it, but it still seems like overkill to me. Has anyone else had experience with rear defroster failure, and how did you fix it? Thanks for sharing your experience/mechanical know-how for this system.
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StephenKnight
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Jun 14, 2003 01:40 AM
