2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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Your not going to like the worst case scenario answer to your problem, but this isn't the first time I've seen this, and its becoming more common with time.
First to possibly solve this the easy way, disconnect your negative battery cable, leave disconnected for 15mins. Reconnect and check if that fixed it. Sometimes little electrical problems can cause stuff like this to happen.
Check ALL electrical connections that may have been disturbed during the thermostat install, this could be solved as easily as plugging in a small plug or hose that was forgotten. Also make sure all the wires in the area of the thermostat aren't binding/stretched/pinched in any awkward way .
Another little bit more indepth thing you can check is to take the gauges out, removing the plastic cover and see if the little needle is just jammed or sticking somehow.
If this doesn't solve it, and it continues to not move AT ALL, then the little electric motor behind the face plate of the gauge cluster has gone bad and needs to be replaced. This requires removing the entire gauge cluster, disassembling it down to the circuit board level, unsaughtering 4 saughters that hold the little plastic/electric motor to the circuit board, remove the defunct motor, resaughtering in the new replacement motor from Ford. A pain to do, but it doesn't cost that much if you can do it yourself. This would be the absolute last thing I would do. I have a video link on YouTube of someone doing this, but its saved on my computer not my iPad.
P/J Front Fascia | GT500 Rear Bumper | Custom CF Dash | BOSS 302 SW | MyColor Gauges | 2010 Black Leather | Shelby Kickers | Pioneer HU | FRPP FR500S Exhaust | C&L Intake | 93 VMP Tune | 8.8 w/ 3.73's | BMR: LCAs, PH Bar & Brace, F & R Sway Bars | 14" 2-Piece Baer Rotors & GT500 Brembos | Custom SS Lines | 19x9 & 19x10 Black GT500 Wheels
Sucks, but can use it as an excuse to upgrade. The gt500 cluster is same price as the gt, but has mycolor in it (if you have the wiring harness behind where the buttons would be, you can use it) and looks a ton more modern. Im waiting for my stepper motors to go out!
Can get em off ebay, probably alot cheaper then Ford. Search mustang stepper motor. If the soldering part intimidates ya, take the circuit board and new stepper motors to an electrician/tv repair man. They can replace them all in under an hour. May as well
replace them all while you got it apart.
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