300Tdi Thermostat Housing Temperature VS Gauge - Defender Source
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  #1  
Old May 7th, 2013, 03:17 PM
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300Tdi Thermostat Housing Temperature VS Gauge

In trying to refine my readings, Gauge vs Housing, I was wondering if I could ask a few of my fellow Tdi owners to do me a favor ?
Could I have you do an IR gun reading of the housing while at FULL operating temperature and report your comparison readings like mine below ?

Currently, I'm seeing H=178*F, and G=192*F

Thanks for your help.
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  #2  
Old May 8th, 2013, 09:20 PM
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BUMP (come on guys, I know this is a pain in the a$$ to remember .... but here's some help. Put your IR gun on your drivers seat to help your rememberry )

Thanks,
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Old May 8th, 2013, 10:42 PM
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Hi Dennis. Sorry for the slow response. I did a reading and came out with 170 on the thermostat housing right above the temp sensor. I think the gauge was around 180. Since I didn't take notes I'll do another one this week with both Gauge and laser read. Is there a way to adjust the gauge to reflect the actual temperature?
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  #4  
Old May 9th, 2013, 12:01 AM
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MY VDO gauge & sender are new and matched. Ian Gregory states his gauge is nearly exact (4.0 gasser). He states he ran VDO specified wire gauge wires. I have a dedicated ground to mine of proper size. As far as I know, the VDO has no adjustment.

What I'm really trying to determine is, "With a 192*F thermostat, is the 'normal' reading on the T-stat housing about 175*F " ? By the way, at 192*F my gauge needle is almost to the half way, straight up point. Visually it's in the same place as the stock LR gauge was.
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Old May 9th, 2013, 04:35 AM
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I am running a matched set of VDO gauge and sender that I got as a kit from eGauges. It's very accurate based on my laser thermometer but it wasn't that way out of the box. It would read correctly with minimal load but rise whenever a major electrical load such as lights or AC were turned on.

To cure it I ran a larger dedicated ground to the gauge from my ground distribution block that's tied direct to the battery, ran a dedicated new larger wire between the sender and the gauge and added a 2nd ground strap to the engine direct from the battery.

Since then, no issues.
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Old May 9th, 2013, 09:58 PM
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Ok first off I don't even know how to read my Temp gauge properly. What's going on here exactly? Attached is a picture of the read out. The temp was 168 near sender and 170 on thermostat housing.
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Old May 9th, 2013, 10:16 PM
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I don't know for sure, but I always assumed half way there was 200 so that needle mark was like the 195ish, and then the mark near 220 was 215. That's what I've always assumed. And I thought it made sense that the marks were relative to temperature milestones.
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Old May 10th, 2013, 02:46 AM
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Seems logical that each line past 180 would be 10 degrees each up to the 220 mark, outside of the 180 to 220 marks would be a guess for me.
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Old May 11th, 2013, 03:17 PM
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I've done everything Ian has done EXCEPT run a lager wire from the gauge to the sender, I think the factory loom wire is an 18ga. I'll run a 16ga today to see if that makes a difference. How big is this wire on yours Ian ?
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  #10  
Old May 11th, 2013, 03:28 PM
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Quote:
Originally Posted by Dennis View Post
I've done everything Ian has done EXCEPT run a lager wire from the gauge to the sender, I think the factory loom wire is an 18ga. I'll run a 16ga today to see if that makes a difference. How big is this wire on yours Ian ?
I think I ran a 14ga. Can't check right now. I ran it direct (1 piece of wire) from the gauge to the sender.

Edit - Pics of the 2 ends. The orange is the new sender wire and the brown is the new ground. You can see how much bigger they are compared to the stock power wire in the plug. I just rotated the pug so as not to cut any stock wires. Stock sender wire was disconnected at the engine and I ran the new wire through and plugged it in.
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  #11  
Old May 11th, 2013, 03:38 PM
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Yea, I just went out & looked at mine, seems to be a 16ga already, I'll run a 14ga direct from gauge to sender.
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  #12  
Old May 11th, 2013, 03:39 PM
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Quote:
Originally Posted by Dennis View Post
Yea, I just went out & looked at mine, seems to be a 16ga already, I'll run a 14ga direct from gauge to sender.

If you want to compare, the green wire in the plug and on the right in the sender pic is the stock one. You can see the size difference.

Edit - Looking at it again it might even be 12ga. I had both as I was making up wiring harnesses for my lights and stuff and was using 12 and 14ga to do that.
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Old May 11th, 2013, 10:45 PM
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Quote:
Originally Posted by ipgregory View Post
If you want to compare, the green wire in the plug and on the right in the sender pic is the stock one. You can see the size difference.
Yup, mine is green too, 18ga, replaced it with a one piece 14ga .... we'll see if that makes a difference.
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Old May 14th, 2013, 02:13 PM
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OK, I have an 8ga wire going from the -BAT to a bolt on the rear of the ALT. A 16ga going from the fire wall ground lug to the gauge ground and a 14ga wire from the gauge to the sender. All end joint connections are soldiered.

Went for a good long drive yesterday pulling my fb trailer, gauge came up to it's normal spot which I guess to be about 192*F based on 10 *F clicks on the gauge from the area between the 180 and 220 marks. My T-stat is one I built, 198*F wax pellet cell in a MOTORAD 319-192 T-stat body. T-stat housing still show an IR reading of 178*F.

I still wonder at what block temperature the engine was designed to operate at ?
Finding that bit of engineering data would be a trick !
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  #15  
Old May 14th, 2013, 08:19 PM
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I ran an extra ground strap I had laying around between the -BAT terminal and a stud on the rear of the drivers side head. Tied all my instrument grounds together and connected them back to a ground distribution block I put in that is also tied direct to the -BAT terminal (all my Aux wiring for my lights, etc. uses this dist block). Finally ran a new 1 piece wire direct from the gauge sender connection direct to the sender on the engine.

Since then mine has been rock solid with its readings irrespective of the electrical load I have running. It does deviate as I would expect the engine temps to do. Stays between about 180 and 195 or so depending on engine load, vehicle speed and outside temps.
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Old May 24th, 2013, 07:04 PM
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Normal operation temperature would be between 190 (thermostat) and 200 depending on driving conditions. I try to never let mine go past 210. Anyways it should hold till 230 in certain extreme conditions but Im not confortable with that. 215 would be max to me. Normal operation temperature can never be below 190 with a 192 thermostat.

Cheers,
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  #17  
Old May 25th, 2013, 10:00 PM
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Well the change in wires and refining my aim of my IR gun has resulted in a very comparable reading between gauge & IR gun properly aimed at sending unit, maybe a 1 degree variation.

With the gauge now reading very close to my IR reading, I decided to change my T-stat to the 203*F unit I made by combining parts.

My initial test drive resulted in my VDO gauge showing just a hair above 200*F going up an extended steep grade. On a level drive, the gauge indicates slightly below the 200*F mark, maybe 2 degrees. Very slight fluctuation just like the standard LR gauge. Our ambient today is about 70*F.
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  #18  
Old May 26th, 2013, 08:46 AM
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Quote:
Originally Posted by defeyago View Post
Normal operation temperature would be between 190 (thermostat) and 200 depending on driving conditions.(...) Normal operation temperature can never be below 190 with a 192 thermostat.
Average temp of the water on mine is between 90 and 95
hitting the 100 on steep ascents...
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Old May 26th, 2013, 09:40 AM
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Quote:
Originally Posted by Cube II View Post
Average temp of the water on mine is between 90 and 95
hitting the 100 on steep ascents...
Pretty much normal Michelle... (I would rather a acouple of less, but would not worry). Hows your radiator core and viscous coupling?

Abrazo,
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  #20  
Old May 26th, 2013, 12:39 PM
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Really?
Mucho reassuring, thanks!

I don't know why but I had this feeling it's "a little too warm"

Viscous coupling is brand new (changed exactly one year ago, the old one had a little play),
radiator instead has never been touched in 16 years...I guess I'll have it properly cleaned as soon as possible.

For the 200'000 Km birthday I gave the old girl a new head gasket
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