Re: Temp gauge, '94 850
Ron <firstname.lastname@example.org> wrote:
>Does the '94 850 have one of those odd 'middle of the dial' tpe temp
>gauges, like some of the 240s?
>My radiator cap cracked yesterday, and was spewing coolant for who
>knows how long, until the low water light came on...the gauge never
>moved from the middle. I also have noted on a hot day, with A/C on and
>pulling a grade, it does not move, and in the winter moves to the
>center fairly quickly.
>If it does have that weird circuitry, what is the fix to have some
>idea what the engine temp really is?
It's not a direct gauge. The temp sensor is connected to the combined
instrument module, whose microprocessor moves the stepper motor
There's a test mode (in the 94's) to see of the pointers and odometer
are working. There's also a fault code readout to see if the sensor
Find the underhood test connectors and plug the wire into hole A7.
Turn the ignition on.
1. Press the button once, briefly (About 1/4 second)
2. Watch the LED and count the groups of blinks. such as 1-2-2. When
it stops, press the button again, keep doing this until the first code
The two temperature sensor faults are: 1-2-1 and 1-2-2.
1. Turn ignition off and on again to reset test mode 1, and then press
the button 3 times.
2. Look at the instrument panel for the following indications:
Fuel gauge: Half full.
Temp: Edge of the red mark.
Odometer: Advances 5 tenths.
If the temp pointer remains at midpoint, then it's the instrument pod
If you had a new Volvo, the status would be impossible to obtain
without a $50.00 visit to the dealer. This is why I'm not considering
a new VOlvo to replace my 94.
BTW: The temp sensor is also used by the engine management computer,
and it it wasn't working, you'd probably have a check engine condition
by this time.
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