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
 
harveyp6 said:
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.
Click to expand...
Thanks Harvey I bought one from mr-wiper on eBay £8.42p inc postage, it does fit and more importantly seems to work fine, but won't know until the summer when car will get hot, kit got as far as the end of the 85 on the gauge, which is where the other one reached. Had to use a larger socket than the old one needed
 
I did a bit of reading up on these, and as usual with OEM suppier parts for Rovers it appears complicated. At least as far as finding modern replacements. It seems the principal symptom is the gauge is likely to under read at the top end with the wrong sensor.

Yours
Vern
 

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