GU TD42 Dash temp Gauge problem

[MudRunnerTD]

@Cuppa yeah I could not justify chasing the fault. I replaced the sender twice and confirmed it was in the loom somewhere so made it redundant.

If it suits me I will put tape over it so I can't see it. It really did my head in and sat on H at idle.

I'm not convinced yet that I have not done damage to the car but we will see. I have to learn the car again now as the factory gauge has a massive blank in the middle of the range where the redarc shows every degree. I just need to learn what is normal.

I run a double gauge in the GQ and took a fair bit of notice on the last trip what the aftermarket was reading against the factory gauge.

[Cuppa]

@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.

IMG_1787.jpg

[Tip12345]

MY tacho .I have replaced the sender once !
my original Dash quit completely . so I purchased a dash from Patrol parts .
I then sent two dashes away to have one repaired . get the Odometer re set . and the clock knobs changed .
that was a few years ago . so the speedo works and the fuel gauges . and the pretty lights . but no Tacho .and a temperature gauge that does as it likes !
I am hoping I can get the dash fixed . I don't like a heap of gauges . I like it to look stock . all he extras only make it a target of thieves. I have had it smashed up twice to get the radio .
I hope to get to the bottom of it soon . my non contact thermometer is now in the glove box !

[MudRunnerTD]

MY tacho .I have replaced the sender once !
my original Dash quit completely . so I purchased a dash from Patrol parts .
I then sent two dashes away to have one repaired . get the Odometer re set . and the clock knobs changed .
that was a few years ago . so the speedo works and the fuel gauges . and the pretty lights . but no Tacho .and a temperature gauge that does as it likes !
I am hoping I can get the dash fixed . I don't like a heap of gauges . I like it to look stock . all he extras only make it a target of thieves. I have had it smashed up twice to get the radio .
I hope to get to the bottom of it soon . my non contact thermometer is now in the glove box !

You could fit the redarc gauge in a little gauge pod in front of het factory one and it would not been seen from the street and would get rid of the redundant factory one. On the TD42 the Engine Pulse sensor on the front of the motor drives the Tacho and it a very simple thing to replace. I was shocked at the price of a new one so grabbed a second hand one from patrolapart and fitted it. They should be fairly reliable for the life of the engine i think so was happy to risk a second hand one.

Sounds like your gremlins could be bigger than just a sender failure though if yuo have had a dash built from spares off 2. Let us know if you get to the bottom of it for sure.

[MudRunnerTD]

@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.

IMG_1787.jpg

hi Cuppa,

Just around the corner from that is the factory sender out the side of that housing. THe only problem with what you have there is the length of the sender. If it is tucked up inside that adaptor rather than into the body of the housing then t will be giving you a slightly cooler reading and not as responsive as protruding into the water cell. It gets the job done though for sure.

cabb78f1c29f13b9783f09ad7e5f771d.jpg

[Tip12345]

Hi brains trust ,
I did some testing over the weekend. I got a 500 ohm linear pot and made a test rig for the Gauge.
Disconnected the temp sensor and put the pot between the wire and earth .
This is what I found . there is a flat pot in the middle of the gauge …. it goes up nicely to the middle and then gets sort of stuck (maybe)
then goes flat out to the stop .just like when its on the sender .. so the plot thickens what to do .
might get another dash and have a play . there might be some sort of Damper in the gauge .ether mechanical or electronic .
just thinking out loud here ….. could be a capacitor that's not playing nice .

[mudnut]

Gq clusters are easy to get out and trouble shoot, but I have not looked at a GU unit. You should be able to swap out each individual gauge.

[MudRunnerTD]

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.

[the evil twin]

Hi brains trust ,
I did some testing over the weekend. I got a 500 ohm linear pot and made a test rig for the Gauge.
Disconnected the temp sensor and put the pot between the wire and earth .
This is what I found . there is a flat pot in the middle of the gauge …. it goes up nicely to the middle and then gets sort of stuck (maybe)
then goes flat out to the stop .just like when its on the sender .. so the plot thickens what to do .
might get another dash and have a play . there might be some sort of Damper in the gauge .ether mechanical or electronic .
just thinking out loud here ….. could be a capacitor that's not playing nice .

Thats exactly what they (factory temp) are supposed to do.

The manuf of almost all passenger vehicles run a suppressed mid range (or normal range if you prefer) so that the gauge isn't dancing all over the place like a direct ratiometer version will.

[Tip12345]

but mine goes to the middle then waits ! straight to full noise eeeek over heating …. no . then stays there . Bugger of a thing .
I have water flow am worried.. not losing any coolant . Any ideas ?