1997 4.0 VDO water temp sensor - Defender Source
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  #1  
Old February 2nd, 2014, 01:03 PM
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Tony Brooks
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1997 4.0 VDO water temp sensor

After having re-read 458 pages on VDO gauges, I thought I'd ordered the right water temp sensor for my 4.0 v8 (323-417). It is clearly too big. Can anyone report first hand which sensor works in a 1997 NAS 4.0?

Thanks
Tony
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  #2  
Old February 2nd, 2014, 08:15 PM
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Read through these

http://www.defendersource.com/forum/...archid=2339747

------ Follow up post added February 2nd, 2014 06:16 PM ------

No. But I can tell you this. When I converted from the 4.0 to the 300Tdi (which came with a temperature sending unit) it would not make my stock temperature gauge function properly. So I went to my local LR dealer and ordered a stock 4.0 sender, which threaded right into my 300's sensor hole.

So my conclusion is that the VDO sensor for the 300Tdi will fit your 4.0
Water Temperature Sensor (1/8-27 NPT) 323-095

This link says the installed unit will show some threads. http://www.defendersource.com/forum/...ead.php?t=8552

------ Follow up post added February 2nd, 2014 06:21 PM ------

Looks like the 323-417 fits the 3.9L engine.

http://www.defendersource.com/forum/...ht=vdo+323-095
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Old February 2nd, 2014, 08:53 PM
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Excellent, Dennis, thanks! I missed that in the 12 times I read through the many relevant threads. I'll report back with any success.
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  #4  
Old February 3rd, 2014, 08:46 PM
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1997 4.0 VDO water temp sensor

I just installed this VDO kit Part# 310-1052 last fall. The sender needs to match the gauge. I didn't have to use any of the adapters that came with the kit. I have a 1997 NAS D90 with the 4.0 V8.
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Old February 3rd, 2014, 08:52 PM
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Thanks, I saw that kit referenced, and I would have gone that route but I already had the gauge. Unfortunately I couldn't figure out which sender came in the kit. I do have 323-095 on its way, fingers crossed it'll work.
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Old February 3rd, 2014, 08:57 PM
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Maybe it is safest to measure the threads on the stock sender.
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Old February 5th, 2014, 02:17 PM
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323-095 fit perfectly!
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Old February 5th, 2014, 09:34 PM
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Now for the next step, verification for trust. I ended up having to run a larger, dedicated ground wire from the gauge to the common ground lung on the fire wall. And then a larger wire from the sender to the gauge. One additional item you need is a good IR thermometer. By good I mean, one that has an accuracy of +/- 2F. Careful about where the IR dot is and the distance at which you measure. On mine at about 18" the red dot is about 3/4" above the measurement "read point." I found one on Home Depot site for a reasonable cost. Then measure the temp at the sender & compare with the gauge. An IR gun is a very useful tool. Bad bearings, partially plugged radiator, etc.
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