Water Temp Sensor for 2200

S

Steve

Member
Gauge not reading, disconnected and earthed the wire to the sensor and gauge went to the High point, so gauge ok. Car is a 1975 SC 2200, plenty of sensors around for the 3.5 V8s, adverts group them with the 2200 but not 2000. Do they fit ?
 
All will fit because the threads are the same, but I can't remember if the gauges require different senders to be compatible and read correctly.
 
The usual sensor for the four-cylinder engine has a red insulator under the terminal, judging by the ones offered by Rover specialists. But my car's gauge (2000 TC series 2) over-read with a red one even after I replaced the voltage stabiliser. A sensor with a black insulator gave a slightly lower reading so I have stuck with that, but it's still a bit too high which suggests my gauge needs a tweak of some sort. An infra-red laser thermometer gun showed the engine to be running at just the right temperature when aimed at the thermostat housing.

My car's previous sensor, a red one, seemed to make the gauge read correctly for a few years after I bought the car but gradually the needle became more reluctant to reach the middle of the gauge until eventually it just stayed on cold. This continued after I replaced the thermostat; the old stat of course was OK, as shown by a healthy heater output and that laser thermometer. I would love to find a sensor that makes my gauge read correctly but so far I've drawn a blank.
 
Early cars had a brown insulator. The red insulator became standard from engine “G” on. A black insulator version was never used.

I’m not so sure current production sensors follow any colour standard, or that a black insulator ever meant anything as I cannot remember ever seeing a black one on a car that wasn’t a late replacement. I’ve heard mixed stories about red vs black. Trying to find a NOS part seems the best approach.

Yours
Vern
 
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