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Temperature sender units again!


Jon White
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Sorry - same old question again! Can anyone tell me what resistance there is accross the temperature sender unit on a 200Tdi defender when the engine is running at its normal operating temperature?

If no one knows would anyone be kind enough to measure it for me? Needs to be a factory 200Tdi defender using the standard defender guage. A discovery one is different!

I'm kind of hoping the answer is going to be in the region of 75 ohms!

Cheers

Jon

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Jon, just treid on my 200Tdi with multimeter set to ohms, couldn't get a reading, it wasn't at normal working temp if that makes a difference, can try again tomorrow after a run to get it upto temp, & I know the temp transmitter is working fine as the gauge moves.

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Guest dew110CSW

I had a weird problem with my temp sender today - Was cruising home from work at about 70mph, just pulled up a hill when I looked down and saw the gauge was at the edge of the white (oh ****), so I backed her down to about 40 and limped along the dual carriageway to a lay-by. Once I got there I popped the bonnet and the engine was really very cold (Not even normal working temp - wasn't far from work and hadn't been dogging it).

So I set off and the gauge went to half way, until I accelerated when it climbed to edge of white, then shifted to second and dropped to half again, and so on till I got into third. Drove home very carefully after that...

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Jon, just treid on my 200Tdi with multimeter set to ohms, couldn't get a reading, it wasn't at normal working temp if that makes a difference, can try again tomorrow after a run to get it upto temp, & I know the temp transmitter is working fine as the gauge moves.

Thanks Ralph. You need one probe on where the gauge wiring would normally go and one probe on a good earth. You should still get a reading regardless of engine temperature.

When its warm a disco one is about 250ohms. I measured the one on Nigels V8 90 the other day and that was about 75 ohms at operating temp, so I'm hoping that a 200 defender one is the same!

The reason for wanting to know - the temp gauge in my series reads right in the middle of the gauge with a sender resistance of about 75ohms. I've got a 200tdi discovery lump waiting to go in, and if all I need to do is use the defender sender unit then I'm lauging with getting the temp gauge to work! Unfortunately the series sender unit is designed to run with a 74 degree thermostat, so when you run with an 88 degree (as the tdi does) the needle stays firmly buried in the red!

Cheers

Jon

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Well, I've tried, couldn't get any where near 75 ohms, multimeter set on the upto 100ohms range & all I could get was 0.3 on the lcd display,tried all the different selections as well, got 82 at the back of the temp gauge.

sorry not been much help :(

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Just treid again, now the engine is almost cold, multimeter set to 2k range for a resolution of 1ohm, one lead to terminal the wire to gauge connects to other wire to earth [body of transmitter] display shows .975 ohms, as I adjusted the ohm range the last 2 digits disappeared off the scale, so .975 is best I can get at the temp transmitter.

my multimeter is a Skytronic model number 600.527. if it helps.

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