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post #1 of 8 (permalink) Old 04-01-2017, 17:07 Thread Starter
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Question Rover 600 Coolant Temperature

Hi All,

Over the course of the winter I've noticed that the needle of the temp gauge of my 600 only just gets above the white sector at the bottom of the gauge. I've changed the thermostat twice and no change. I've even added an 82 celsius thermostat to the top hose, and whilst it warms up more quickly the gauge still barely gets out of the white.

Does anyone have any ideas as to the cause?... do the temperature senders have a habit of going high resistance?

Cheers,

Dave.
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post #2 of 8 (permalink) Old 04-01-2017, 17:16
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You have 2.0 Honda engined Rover 600? If so, so do I, and only thing what I can say is that on winter time engine needs more time to get to working temperature. If you have short journeys, you might not get to the working temperature.
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post #3 of 8 (permalink) Old 04-01-2017, 17:21 Thread Starter
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coolant temp, cold weather and short journeys.

Many thanks for your reply;

I'd have agreed with you, but the white sector is so low down the gauge, and as I said I changed the main thermostat and added another, and still there's no real difference. I drive 15 miles (24km) to work each day.

Cheers

Dave.
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post #4 of 8 (permalink) Old 04-01-2017, 17:33
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How much time you spend on the road while engine running? I have one third of that amount each day to pass, and I spend 12 minutes for this trip. During that time, engine cannot reach working temperature.
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post #5 of 8 (permalink) Old 04-01-2017, 18:22 Thread Starter
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about 40 minutes - that should be plenty of time to get both water and oil hot.

I'm certain the water is getting hot - I was looking for other suggestions, like faulty temp senders.
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post #6 of 8 (permalink) Old 05-01-2017, 14:19
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The data that I have for the change is resistance of the sensor with temperature is given below, but I think there are two sensors on the engine; one feeds the gauge and one feeds the ecu. Think this data was for the gauge, but not 100% sure
Temp'C / resistance ohms
0 / 5000
20 / 4000
40 / 1000
60/ 500
80 / 400
100 / 200





t lost the table format
temp resistance
05000
204000
401000
60500
80400
100200
**** lost the table format

Last edited by bazz54; 05-01-2017 at 14:25.
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post #7 of 8 (permalink) Old 05-01-2017, 19:36 Thread Starter
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Bazz,

Many thanks for that - I'll give it a go.
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post #8 of 8 (permalink) Old 07-01-2017, 16:06 Thread Starter
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Solved!

Many thanks all - I grounded the sender wire and the gauge quickly went to full scale deflection, so it looks like the sender resistance has gone high.
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