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Screwy Temp. Gauge 200 1984

posted by  Rludwick on  Thu Feb 28 13:31 CST 2002
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last visit: Sat Aug 31 16:10 CST 2013
[RELATED]

The Temp gauge on my '84 240 diesel reads consistantly about 2.5mm above the 9 o'clock position ( about halfway between 9:00 and the red zone )when the engine is at thermostat opening temp.
The engine is not hot at all .Temp. downright mild on hose going back to engine from radiator.
I put an external temp meter on the metal at the outlet hose and it was only reading 59 deg c.
On hot days with AC on climbing hills the gauge will get up to red zone and fan switch (87 deg. c ) will kick on about that point.
Radiator , thermostat, waterpump all new.
Gauge checked out OK as per green manual,
Just installed new sender.

Any ideas on what to do to that gauge to get it reading properly( other than taking a pair of pliers to the needle )?

Thanks-----------Robert








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    Screwy Temp. Gauge 200 1984

    posted by  Don Foster on  Thu Feb 28 14:07 CST 2002
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    last visit: Sun Oct 5 11:53 CST 2014
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    Assuming the gauge itself and the sender are OK (and you believe they are), the voltage regulator (the one for the gauges) could cause a stable, consistently high reading. The VR sends a stable voltage to the gas and temp gauges (only) -- around 9 or 10 volts, I think. If the VR was sending 11 or 12 volts, it would result in a high reading on BOTH gauges. However, we're less likely to detect and react to a slight error on the gas gauge.
    --
    Don Foster (near Cape Cod, MA)







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