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D2 - Engine Bay Everything under the bonnet |
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Thread Tools | Display Modes |
#1
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Temperature gauge creeping past 90
Whilst sitting in traffic coming back from church on Sunday I noticed the temperature gauge creep past 90 and settled at around 95 for quite some time before moving up to 100.
Is this normal? I've never seen this before as it's always been stuck on 90, but Sunday was ridiculously hot in London.....and I had the air conditioning on if that makes a difference? A genuine thermostat was put on about 9 months ago along with timing belt etc etc, so that is probably OK. The coolant was flushed and replaced the same time as the timing belt so that's ok too. Could the rad need replacing? The fan was also kicking in, but what temperature should it activate? Do you think this is an issue or just the effect of the searing heat we're getting? Maybe some of you guys have the same with your 8's
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor ) 1988 E30 Coupe - Royalblau Metallic 2003 S4 Avant - Light Silver Mettalic 2016 S5 Coupe Black Edition - Ibis White |
#2
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The fan cuts in at 94degC iirc. Apart from the high ambient temps, given the work you have had done I cant see what may be causing the issue.
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
#3
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VW / Audi's will display a fixed 90c on the gauge when the actual coolant temp is between a range. So you can't tell the true temp from the instrument cluster. Have you VCDS or OBD11? These will be able to read the true coolant value.
I don't know at what temp the rad fans will kick in on the D2, but on a D3 it's 100c
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Matt 2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN, |
#4
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Mine used to go over 90 when sat in traffic or slow moving when it was hot outside. Personally i wouldn't worry about it until it got to 120 and i'd be shutting it down on the mark between 120 and the red mark, if it wasn't starting to cool before that. I know others would play a lot safer and shut down before then.
I always used genuine coolant. Was it genuine coolant used when it was filled up? Don't worry about the fan coming in, at least you know it's working and doing it's job.
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8. Bright yellow bus o love. Last edited by Dezzy; 21st June 2017 at 04:15 PM. |
#5
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OK, thanks for the reassurance chaps - I could just be panicking over nothing. It's certainly driving and behaving as normal.
The coolant was genuine Audi stuff so nice and pink
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor ) 1988 E30 Coupe - Royalblau Metallic 2003 S4 Avant - Light Silver Mettalic 2016 S5 Coupe Black Edition - Ibis White |
#6
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Quote:
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
#7
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I am having the same issue. Although I have a known bad coolant temp sensor, so that could be it in my case.
I thought the viscous fan needs to engage at certain temp? Its always idling but not full force until the clutch engages. I remember there was a simple check to test it, if you can stop it with a pen then the clutch hasnt engaged. Just to add, from experiences with my previous S8 it should not overheat even in really hot weather. I took that one all over Europe, down to Morocco, and to central Spain when temps were over 40C, the gauge never went past 90. So to my mind something is not quite right with my current 8 Last edited by Goran; 21st June 2017 at 06:41 PM. |
#8
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Quote:
Couldn't you test it just as easily (but perhaps a little more safely) without the engine running? If the engine/coupling is hot, I would imagine the fan should be difficult to turn, should it not?
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------ ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre dιcor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust |
#9
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Well, everyday is a learning day. I hadnt appreciated the potential issues with viscous fans and the temperature sensitive clutch engagement mechanism. I found this article helpful:
http://www.freeasestudyguides.com/pe...an-clutch.html The failure of the viscous fan mechanism could be your issue.
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
#10
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On my last 8 I knew the viscous fan was gone because it sounded like an old Mitsubishi shogun when up to temp and constantly runnIng.
I plugged in the my OBD11 dongle earlier and cycled through the sub menus. I didn't realise there was something for coolant temps anyway on idle and up to temp, the gauge indicated 90 degrees but was actually 99 degrees according to the app. When driving the gauge remained at 90 but the app indicated the car was running between 103 to 104 degrees. It spiked at 105 but then went down to 104 again. The whole time the gauge remained at 90
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor ) 1988 E30 Coupe - Royalblau Metallic 2003 S4 Avant - Light Silver Mettalic 2016 S5 Coupe Black Edition - Ibis White |
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