problems with temp gauge
Moderator: martauto
Hi. I've got a 1985 325i which had a problem with the temperature gauge working intermitantly then packed in all together. I earthed out the temp sensor and the needle didn't move. I then changed the whole clock set ( 3 months ago)and it worked fine til now!!! The same thing has happened again. I've noticed that the sevice lights have also been coming on and off could this have anything to do with it? Don't know what else to try besides getting another clock set unless you have any ideas chaps? Does anyone know the early clock set part number? Think it had 883 in the code but not sure? Cheers
If it's too loud you're too old!!!
Mine was intermittent and pretty unpredictable. I'd heard there are two small nuts on the back that are grounding points for the dials.
Took the clocks out and one was missing! Put on a new nut and it's been spot on since.
Try tightening the nuts?
Took the clocks out and one was missing! Put on a new nut and it's been spot on since.
Try tightening the nuts?
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Brianmoooore
- E30 Zone Team Member
- Posts: 49358
- Joined: Mon Jan 10, 2005 11:00 pm
If the service lights are doing odd things, then the chances are that the SI board batteries are dud. This is also likely to affect the temperature gauge.
ok. I've taken the dials out and the nut and washer that hold the dial in were dirty possibly causing a bad connection. I've cleaned them up and it's working at the moment!!! Interesting that the service lights can affect the temp gauge. If this doesn't cure the problem then it looks likely that the batteries will be next to try. Easy to replace? 
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Brianmoooore
- E30 Zone Team Member
- Posts: 49358
- Joined: Mon Jan 10, 2005 11:00 pm
Batteries are soldered in, but are easy enough to replace and if dead ones are left in place too long, they will leak and cause terminal damage to the printed circuit board.
The reason they affect other instruments, is because they tend to go short circuit and heavily load the power rail on the PCB.
All this only applies to the older NiCd batteries.
The reason they affect other instruments, is because they tend to go short circuit and heavily load the power rail on the PCB.
All this only applies to the older NiCd batteries.
Trouble i've got is the car is on ebay at the mo ( see link in cars for sale forum under track day car shocking colour ) and i need to get sorted asap. I may just take it apart and have a go myself now i know where to look. It'll probably blow up or catch on fire as i don't do electrics but i'll have a go!!! 
If it's too loud you're too old!!!
Just rememberd. I've got a spare later dash which i brought in error thinking they were all the same. If i hack that one apart will the batteries,and pcb be the same 
. I know alot of the internals are different ie the speedo.
. I know alot of the internals are different ie the speedo.