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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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 Posted: Sun Oct 23, 2011 6:12 pm Post subject: Temp Gauge SENDER testing |
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Today I did some testing of the single wire temp sender used in watercooled from 82-91 (except 2.1 waterboxer 2wd) using boiling water.
4 senders were tested, 2 original VW ones and 2 different aftermarket.
Results were similar, measured ohms at fast boil with only the threaded tip of the sender dunked in the water for a couple minutes each until the ohm reading stopped dropping. The numbers jumped around a few ohms up or down so these are what I settled on as mid points. The senders were at the surface with bubbling around them but not quite touching the nut flats. I measured the water temp 2 ways, using a thermometer and a VDO aftermarket gauge/sender combo, both read just above 210 F as expected. Will report more results after more testing.
Mark
Last edited by crazyvwvanman on Mon Oct 24, 2011 9:30 am; edited 1 time in total |
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insyncro
Banned
Joined: March 07, 2002
Posts: 15086
Location: New York
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| Posted: Sun Oct 23, 2011 6:16 pm Post subject: |
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Nice job.
I thought Sundays were for watching football  |
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Ahwahnee
Samba Member
Joined: June 05, 2010
Posts: 9798
Location: Mt Lemmon, AZ
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| Posted: Sun Oct 23, 2011 6:37 pm Post subject: Re: Temp Gauge SENDER testing |
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| crazyvwvanman wrote: |
| ...These numbers should put a temp gauge needle right in the led but I will try to test that with a couple clusters one day soon... |
Are you saying that the middle of the LED = 210*F? |
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dobryan
Samba Member
Joined: March 24, 2006
Posts: 16501
Location: Brookeville, MD
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| Posted: Sun Oct 23, 2011 6:45 pm Post subject: Re: Temp Gauge SENDER testing |
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| Ahwahnee wrote: |
| crazyvwvanman wrote: |
| ...These numbers should put a temp gauge needle right in the led but I will try to test that with a couple clusters one day soon... |
Are you saying that the middle of the LED = 210*F? |
My question too. My experience is that the middle of the LED is somewhat in the 185ish range but the gauges vary a bit (lot).
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'87 Westy w/ 2002 Subaru EJ25 and Peloquin TBD
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https://www.thesamba.com/vw/forum/viewtopic.php?t=746794 |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Sun Oct 23, 2011 6:47 pm Post subject: Re: Temp Gauge SENDER testing |
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I think I said I was going to test that soon. This is a work in progress. The Bentley test for the stock thermostat says it starts opening at 185-F and finishes opening at 221-F, page 19.8 bottom right.
Mark
| Ahwahnee wrote: |
| crazyvwvanman wrote: |
| ...These numbers should put a temp gauge needle right in the led but I will try to test that with a couple clusters one day soon... |
Are you saying that the middle of the LED = 210*F? |
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r39o
Samba Polizei
Joined: May 18, 2005
Posts: 9800
Location: San Diego
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| Posted: Sun Oct 23, 2011 9:18 pm Post subject: |
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| crazyvwvanman wrote: |
| Today I did some testing of the single wire temp sender used in watercooled from 82-91 (except 2.1 waterboxer 2wd) using boiling water. |
You are testing the sender all VWs of the era used except the 2.1 wbx, is that what you are doing?
(I recognize that aluminum coolant flange from the head of an I4.)
If so, why?
I recall the senders are the same based on part number, if I recall.
(I have a bag full of them and some ARE different, you have to look real real close to see or just measure. My collection spans a few decades worth of collecting though.)
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Vanagon Nut
Samba Member
Joined: February 08, 2008
Posts: 10371
Location: Sunshine Coast B.C.
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| Posted: Sun Oct 23, 2011 10:14 pm Post subject: |
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I did something similar, though not as thorough, not long ago:
https://picasaweb.google.com/tubaneil/ECTTesting#5389230466131592754
Though I was measuring the sensor that supplies resistance to ECU, (AKA temp 2 for WBX?), IIRC, my used OEM "Luxembourg" showed resistances closest to what the A3 Bentley specifies. I imagine this is the OEM part. The made in China FLAPS offering was 2nd place. (can't recall brand of 3rd sensor)
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crazyvwvanman
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Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Mon Oct 24, 2011 4:00 am Post subject: |
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These are the gauge senders used in all Syncros, all 1.9 wbx, and all diesel Vanagons. At least this is true for USA/CA models. Yes, some other VW and Audi products used the same one. This is also the same one used in many engine conversions such as Zetec and Subaru.
Mark
| r39o wrote: |
You are testing the sender all VWs of the era used except the 2.1 wbx, is that what you are doing?
(I recognize that aluminum coolant flange from the head of an I4.)
If so, why?........ |
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SyncroGhia
Samba Member
Joined: August 21, 2009
Posts: 2458
Location: Highnam, UK
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| Posted: Mon Oct 24, 2011 4:11 am Post subject: |
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I did a similar but not quite to scientific test on my oil temp sensor setup.
I removed the temp sensor from the block, earthed it and then poored boiling water from a kettle over it while watching the gauge.
The first test showed around 65oC!!! I'd been wondering why the engine ran so cold!
A new temp sensor later and it showed 95-98oC. Much better. 
MG
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