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Ausjacko Offline
#1 Posted : Tuesday, 6 February 2018 7:00:20 PM(UTC)
Ausjacko

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Hi All
Looking for help to ID the correct VDO temp sender for the HT Monaro. Gauge is VDO and currently I have the 320.002 sender but the gauge is not reading correctly- too high. Any suggestions on the correct sender for the HT VDO GTS gauges?
Cheers
Jacko
gmholdman Offline
#2 Posted : Tuesday, 6 February 2018 8:45:46 PM(UTC)
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I believe there were 2 senders, 7428031 standard radiator, no air. And heavy duty radiator, air-con 7438478. I may need correcting?

Edited by user Tuesday, 6 February 2018 8:48:43 PM(UTC)  | Reason: Not specified

Dr Terry Offline
#3 Posted : Wednesday, 7 February 2018 6:57:12 AM(UTC)
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The correct temp sender for HK/T/G temp gauge is VDO 320.021. Your 320.002 suits later models.

There were 3 different temp senders in HK/T/G.

7428031 was the standard switch for a temperature warning light.

7438087 was a higher temperature version of the warning light switch used for a/cond etc.

7438478 is the GM-H part no. for the gauge sender (VDO 320.021). The gauge sender is easy to tell apart from the warning light switches, as it is made of brass & has a smaller (1/8" NPT) thread.

Another thing to be wary of is using the colour of the plastic ring on the gauge sender for ID purposes. GM-H used 2 suppliers for gauge senders, VDO & Flexdrive. These 2 companies used different coloured rings for the same spec senders. The best method of ID in the absence of a part number, is to measure it with a multi-meter against the factory specs.

Dr Terry
If at first you don't succeed, just call it Version 1.0
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Ausjacko on 7/02/2018(UTC)
Ausjacko Offline
#4 Posted : Wednesday, 7 February 2018 7:09:41 PM(UTC)
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Hi Dr T
Thanks. Is that VDO ref the correct sender for the 350 SBC?
Cheers
Ian
Dr Terry Offline
#5 Posted : Friday, 9 February 2018 6:52:44 AM(UTC)
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Originally Posted by: Ausjacko Go to Quoted Post
Hi Dr T
Thanks. Is that VDO ref the correct sender for the 350 SBC?
Cheers
Ian


Yes, it does. The sender has to match the gauge, not the engine.

AFAIK this gauge sender suits all engines from HK to HQ & also LC/LJ Torana.

Dr Terry

If at first you don't succeed, just call it Version 1.0
gm5735 Offline
#6 Posted : Tuesday, 13 February 2018 1:17:22 PM(UTC)
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The VDO 320.021 is a good choice for giving the appearance of solving an overheating engine, but a bad choice for accuracy. It will result in a temperature which reads about 40 degrees F low.

[img]https://drive.google.com/file/d/18J7VKfpQA68oaPDshKY6UniXJ9tlnK3m/view?usp=sharing[/img]

Edited by user Tuesday, 13 February 2018 1:26:05 PM(UTC)  | Reason: Not specified

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Ausjacko on 13/02/2018(UTC)
Ausjacko Offline
#7 Posted : Tuesday, 13 February 2018 8:41:03 PM(UTC)
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OK, so looks like we are back to my initial question then. The gauge is a VDO and my thinking, call me wild and crazy, is that there must be a VDO sender to match the gauge. Here is a link to the VDO temp senders and their stated resistance.

http://www.vdo.net.au/se...ature-senders-switches/

320.002 is rated at 297 to 23 Ohms
320.003 is rated at 73 to 10 Ohms
320.021 is rated at 323 to 18 Ohms

These specs do not correlate well with the findings outlined in the graph from GM5735. EG VDO specs the 320.002 at 38.6Ω for 212deg F (100deg C) yet the graph has it just below 50Ω. However, the data does support GM’s observation that the 320.021 will result in a low temp reading on the gauge; a false sense of comfort if you like.

Testing from the gauge

My gauge reads from 100deg F to 260deg F, with 180 deg F noted in the middle and dashes at 120 and 220. Right, so what I did was work backwards from the gauge using a variable resistor in place of a sender and digital multimeter to see what the gauge needs to read the various temp markings on it. At 180deg F it needs 40.2Ω and 140deg F was achieved with 56.5Ω. 10Ω sent it off the high end and 128Ω sent it under the low end. What this shows us is that the sender starts with a high resistance and this reduces as the temperature rises.

The results

I plotted my gauge results together with the sender specs from the VDO site. Where I did not have a specific measurement for a given temp, I extrapolated a result using a linear change in the resistance at a given temp. Here is how it looks:



The results
For my gauge, it looks like the 320.003 sender provides the closest match to how my gauge reads. That is, the brown line (320.003 sender) is the closest match to the red line (the gauge).

Hope this makes sense and is of use to others. Let me know if I have made any errors in my testing/approach.

Edited by user Wednesday, 14 February 2018 3:40:47 PM(UTC)  | Reason: fixed a type

HK1837 Offline
#8 Posted : Wednesday, 14 February 2018 7:58:12 AM(UTC)
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Did you make an error in the second last sentence in the brackets? Should it read (320.003 sender)?
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Ausjacko on 14/02/2018(UTC)
Ausjacko Offline
#9 Posted : Wednesday, 14 February 2018 3:43:00 PM(UTC)
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thanks HK1837, fixed that up
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