tempreture gauge
 

hi all my temperature gauge is playing up .
it moves to about 11 o clock as soon as i start up
i disconnected the suppy to the engine today its to the left of no 1 injector
but no change it still goes on and moves to the same place so i take it the temperature sender from the block is not to blame .
if its the clock my fuel gauge plays up to going to full always when not full
i have renewed my circuit board with a new one a few years ago so can't be that .
any help much appreciated

Sounds like you have confirmed that the problem is not with the sensor, so I'd suspect a wiring fault or a cluster issue.

Does the gauge just stay at 11:00 all the time, from the time you start it to the time it's fully warmed up? Or does it move as the engine warms up, but indicate incorrectly?

What year is your car? 740 and 940 instrument clusters from 1991-1993 frequently have problems, and 1994-on can still be troublesome too.

940 tdi auto 1995
 

hi v8volvo
thanks for prompt reply .
my car is a 1995 940 TDI .
i have had to renew the blue circuit board only a few years ago
as my dash lights all failed one by one . so i have a new board .
the temperature gauge and fuel gauge have been faulty for a long time now .
so any thoughts whats causing this
regards jim

The gauge on my 940 was 'whack to read' for ages. I had checked out the wiring and the flexi-circuit on the back of the cluster to no avail.

Eventually I got so fed up with it that I delved further: There is a small pcb inside the gauge itself, behind the metal cover. There was a dry solder joint on this. Re-soldered all the joints on that board and it was fine after that...

Temp Gauge
 

Funny you say that s mine has just started to do the same.....then whack to read...

940 tdi auto 1995
 

thanks for your valued comments .
i will delve deeper into this when i get time and let you know

temp gauge
 

Hi
This is a really easy fix. Remove instrument panel . Split instrument panel and then remove temp Gauge . resolder the drive chip on the pcb , for some reason they go dry jointed , you will see crystaline solder which isnt good . Reassemble and hopefullly it will work correctly . Mines been fine ever since the resolder
Cheers

940 tdi auto 1995
 

hi are the temp and fuel gauge related on ciricit board as mine play up at the same time so I'm guessing there is a link between them