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#1
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Coolant airlock help on s8
Where are the bleed valves for our s8's?
I had a hose off to do the manifold a while back, topped back up after the work but today a little 20 mile trip saw the gauge hitting nearly red. Im not losing any water from anywhere and no steam so seems to be an airlock me thinks. The res pot is at max but when car warms it rises to the top of the filler neck. Help appreciated.
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2006 S8 5.2 V10 |
#2
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Today I went to sart the car and just with ignition on the temp gauge is sitting on 90. Dont remember this happening before.
Dodgy thermostat possibly? When i do a run later i will try and get some real time info with vcds and see whats going on.
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2006 S8 5.2 V10 |
#3
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could just be a sensor, especially if the gauge said 90 and the engine was cold. but better be safe than sorry. I am not sure on the location of the coolant temp sensor on the V10.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles |
#4
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Is it the same "standard" green sensor used widely on VAG cars?
If it is then remember it's a 4-pin connector because there are 2 separate sensors inside. On D2s and the like one sensor mainly feeds the temperature gauge while the other informs the ECUs, so you can see some rather weird effects when there's a partial failure.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later) 1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! |
#5
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This morning was 90 at 05:30 then when i went for a run at 12:30 it was reading 127 on a dead cold engine and showing throttle body temp as 42 when the ambient was 24.5. The throttle body i will concede as had the bonnet up and sun baking down on it but the 127 is a joke. This was on vcds i was getting these readings.
I have no water leaking whatsoever the levels do not drop. The cap doesnt even his and spit when i open it. So possibly the temp sender unit?
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2006 S8 5.2 V10 |
#6
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Was about 4mm of water in the plug/socket causing it to do the needle dance. All dried off. Just had a little spin and hovering around the 90 mark as it used to. Pain in the arse to get to though!
Still i like free fixes that only take an hour or so. It is a 2 pin unit on the S8. Im going to replace it anyway just to be sure. Its still sitting at 90 on a dead cold lump. Cant risk it not work and the fan not kicking in.
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2006 S8 5.2 V10 Last edited by Rick; 4th August 2018 at 08:15 AM. |
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