Odd Coolant gauge behavior

5.0 V10 50v biturbo - 571 bhp
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tom4motion
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Odd Coolant gauge behavior

Post by tom4motion » Fri Apr 02, 2021 7:43 pm

Evening everyone,

My RS6 has developed a strange issue over its winter sleep.

Driving it to its MOT this morning I noticed the temp gauge didn't move at all, but the oil temp did rise to what I would expect.

After the MOT I had a look on VCDS and found no error codes in the engine or instrument modules, Engine G62 coolant was showing 92⁰‐96⁰.

When I looked in the instrument module, the coolant temp was showing -50⁰ :? . I've done the analogue dial test and the temp gauge moves so that's working.

Does the RS6 have 2 separate coolant probes, or are the combined into 1.

Also, where is/are the probe(s) located in the engine bay?

Cheers, Tom
2006 RS4 Avant, Sprint blue, Buckets, Carbon trim, black optics, MRC stage 2 and Milltek non res valve'd. SOLD

2008 RS6 Avant, Sepang Blue, APR stage 1

Ranger4130
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Re: Odd Coolant gauge behavior

Post by Ranger4130 » Fri Apr 02, 2021 10:38 pm

One here

Image


And another here

Image

Couldn’t say which is which but I would guess the second would be the temperature sender for the gauge.

Next time I’m in the engine manual I’ll take a looksie and see if it states which sensor does what.

Ranger4130
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Re: Odd Coolant gauge behavior

Post by Ranger4130 » Fri Apr 02, 2021 10:51 pm

Didn’t take long. Engine coolant sensor

Image

tom4motion
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Re: Odd Coolant gauge behavior

Post by tom4motion » Sat Apr 03, 2021 11:46 am

Ranger4130, thanks for that :thumbs:

Actually looks relatively easy to get at both.

Out of interest where did you get the repair manual from?


Cheers, Tom.
2006 RS4 Avant, Sprint blue, Buckets, Carbon trim, black optics, MRC stage 2 and Milltek non res valve'd. SOLD

2008 RS6 Avant, Sepang Blue, APR stage 1

Ranger4130
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Re: Odd Coolant gauge behavior

Post by Ranger4130 » Sat Apr 03, 2021 1:32 pm

Yeah doesn’t look too bad at all right at the front on top. I’d rather be changing that then the AC compressor and engine mounts.

Manuals.... I got them from a website. Cardiagn or something.

https://cardiagn.com/audi-a6-4f4f24f54f ... -diagrams/

If the link doesn’t work send me your email and I’ll forward them onto you.

tom4motion
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Re: Odd Coolant gauge behavior

Post by tom4motion » Wed Apr 07, 2021 12:40 pm

I don't suppose anyone knows the part number for the sensor in the 1st pic by the oil filter?

Tried looking on the online ETKA and even phoning Audi with no luck.

Cheers, Tom
2006 RS4 Avant, Sprint blue, Buckets, Carbon trim, black optics, MRC stage 2 and Milltek non res valve'd. SOLD

2008 RS6 Avant, Sepang Blue, APR stage 1

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IanH755
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Re: Odd Coolant gauge behavior

Post by IanH755 » Wed Apr 07, 2021 5:15 pm

That unplugged one in the centre of the top picture next to the oil filter housing is the Fuel Low Pressure Switch G410 - item 13 in the top right of the diagram - with it's vertical metal bracket on the outboard side, small hose behind it and black plastic hose clip above/behind it with the hose following the same route as the diagram.

Item No - 6E906051K

G410 location in Workshop looking from behind and facing forwards so you're seeing the back of the filter housing and the two big plugs that you can see in the top picture posted by Ranger 4130 above -

Image

The only Coolant Temp sensor is the G62 sensor which was in the second pic and has already had it's info posted by Ranger4130.
***OLD*** Daytona C5 RS6 Avant - MRC'd - 500HP & 820NM (PistonHeads Link).

***NEW*** Daytona C6 RS6 Avant - MRC'd - 907HP & 1130NM (PistonHeads Link)

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