GU TD42 Dash temp Gauge problem

[mudski]

@mudrunner My having put the coolant sender where most with TD42's do - screwed in just above the the water pump, may show cooler temps as a result? (Where is the factory sender located?).
I run with 80 to 90 degrees showing depending upon ambient temps. Only above 90 on long slog hills. I recently looked to see what Redarc gauges cost & was shocked. Did I really spend that much on them? But I am so used to driving with them now I'd hate to be without them . Oil Pressure/ Coolant temp on one, & EGT & boost on the other. Love'em.

Attachment 81931

The tip of that probe mate will barely be inside the s/tat housing, if at all. I have the same probe and they are quite short.

[Tip12345]

I think I will send my dash down to Garry at Ringwood speedometers . sounds like a good guy .

[Cuppa]

The tip of that probe mate will barely be inside the s/tat housing, if at all. I have the same probe and they are quite short.

As I recall the fittings were neccessary to match the Redarc thread to the thermostat housing, with not a lot I could do about it. I have become very familiar with the temperature readings I get, which whilst potentially a bit lower than what they really are, are a 'relative' thing. I would know instantly of there were anything unusual, so happy to leave it as is.

[MB]

I think I will send my dash down to Garry at Ringwood speedometers . sounds like a good guy .

Extremely knowledgeable team, haven’t needed their service for some 20 odd years but do remember top assistance if that was Garry still back then?
I’m sure he’ll honestly agree though that a real gauge is still a very good idea as first point of reference before the fixed OEM dash he’ll no doubt sort out easily too



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[Tip12345]

Yes still there .

[MudRunnerTD]

As I recall the fittings were neccessary to match the Redarc thread to the thermostat housing, with not a lot I could do about it. I have become very familiar with the temperature readings I get, which whilst potentially a bit lower than what they really are, are a 'relative' thing. I would know instantly of there were anything unusual, so happy to leave it as is.

yeah i had the same problem. while in Enzed asking for the correct adapter (I took the factory sender with me and the new sender => Make this fit this please...) they cut a new thread for me which i expected to cost me drug money but it was only a couple of $. Winner. While i waited. took a couple of minutes.

[Wizard52]

The factory gauge is designed to sit wgen in the normal range of temperature so a flat spot makes perfect sense. It achieves operating temp then won't move up again until it goes outside the standard temperature range.

This is what is doing my head in with the Redarc gauge, it captures every degree of change so you see the movement. That factory gauge just says ......Normal.

Agree. My factory gauge gets to normal position at 60c (reading from VDO gauge) and never moves no matter what happens. The real gauge (VDO) goes up and down like a you know what depending on ambient temp of course and driving conditions so varies from 80 at normal to 105 when required. It is reassuring to have the backup of factory gauge just in case. The VDO oil pressure gauge is invaluable as well showing 70psi at cold start up reducing to 60psi at crusing speed. I love these 4.2tdi engines.

[MB]

Great Motors Agreed Wizard Mate!
I believe from my torturous eventual findings too you’re running perfectly healthy temp ranges by the sounds of it.
In our local yearly average Victorian climate we settled on an 88C thermostat year round for the family wagon and found 92C highway winter flogging it’s absolute best power and huge fuel saving economy.
FWIW: After extensively trialling 76.5C & 82C & its current 88C thermostats we found next to no difference on its highest 105C summer flogging temps. Only ran stupidly way too cold at idle on the 76.5C tropical global OEM thermostat :-(
My nuffy thread on it all is on here somewhere:-)

EDIT:
The OEM 88C’s idle at 88C
The OEM 82C’s idle at 82C
The OEM 76.5C’s I found can idle as low as 40C in our climate due to their missing ‘Jiggle Pins’ is my honest belief, happy to be tought other reasons but that’s all I could nuffy understand the one single difference

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