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Thread: Intermittent temp gauge.

  1. #1
    Iceash's Avatar
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    Intermittent temp gauge.

    Hi all,

    had the stat changed as I was getting odd temp readings. As it climbed it would fall suddenly, then climb higher then fall again. It would eventually get to 90 then maybe now n then drop to say 70, hold then climb back to 90. The 49c would mirror this also on climate con. Could this be the cts? Or something else?

    thanks,

    Ash

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  3. #2
    myth's Avatar
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    Definitely the CTS. If you have a vag com, surely it will throw a code.

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    Iceash's Avatar
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    Quote Originally Posted by myth View Post
    Definitely the CTS. If you have a vag com, surely it will throw a code.
    Don't have access to vag com. Can't be anything else then?

    Is it something Audi keep on the shelf?

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    Bradderz_1988's Avatar
    Dont replace it, Upgrade it !!

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    Mine did this a while back when i fitted a new temp sensor and thermostat !! I would be driving on motorway and it would drop to 70' then slowly creep back to 90' left it alone to see how it got on and its never done it since !! Both were genuine audi parts !!
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F21 Kit - 3" MAF - Saab Reds - THS Decat - Non Res Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - PFR6Q Plugs - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do/planned -Eibach pro's - GT2871/76R + FMIC + ME7 (maybe) + Engine/stroker Build

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    Iceash's Avatar
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    Been doing it for weeks now, new stat fitted today. Fitted the higher temp one though. Engine and oil nice n toasty.

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    B5 BIKER's Avatar
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    Definitely the cts mate
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    Audi likely to carry one on the shelf?

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    B5 BIKER's Avatar
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    Ya they get changed that often they normally would
    2 different versions though. 2 pin or 4 pin

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    Iceash's Avatar
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    Quote Originally Posted by B5 BIKER View Post
    Ya they get changed that often they normally would
    2 different versions though. 2 pin or 4 pin
    Has 4 wires coming out of it so assume 4 pin. So other than feeding temp to dash gauge. What's its purpose?

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    Very common fault across almost all VAG cars 97-2005 ish.
    GENUINE VW COOLANT TEMP SENSOR SENDER AUDI A2 A3 A4 A6 A8 TT S3 059919501A | eBay
    Old design CTS will be black new design ones are green.

    Closer to £30 from the dealers. They should have them is stock.

    Karl.
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    Karls 312bhp A4 3.0 TDI build thread http://www.audi-sport.net/vb/audi-s4...ld-thread.html

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    Iceash's Avatar
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    Funnily enough, I went through 3 in 5 years on my 6n polo!

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    Bradderz_1988's Avatar
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    That one is the newer style 'D' shaped two pin sensor you need the old square style 4 pin one thats green they are what audi supplys and have superseded from the old blue square 4 pin sensor !!

    But double check as some late TQS's have the 'D' shaped green one !!
    1999 Audi A4 1.8T Quattro Sport - Volcano Black

    Mods - Frankenturbo F21 Kit - 3" MAF - Saab Reds - THS Decat - Non Res Milltek - ECS Crank Pulley - 034 Snub + Bracket/Gbox Mounts - 1Z/S2 Clutch + Flywheel - 007p - ICM + EVAP Delete - PFR6Q Plugs - S4 B6 345mm Brakes - 300mm Rear Brakes - Goodridge Hoses - LCR Splitter -S4 Bumbers + Skirts/Mouldings - OEM Xenons - Apikol Diff mounts - Polytek'd Rear Diff Mount
    To do/planned -Eibach pro's - GT2871/76R + FMIC + ME7 (maybe) + Engine/stroker Build

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    They have 4 wires because there are two seperate temperature sensors in there. One supplies the ECU the other the dash for the temperature reading. One or both can be intermittent. Quite often you only notice because the temperature gauge starts going like a windscreen wiper.
    Karls 312bhp A4 3.0 TDI build thread http://www.audi-sport.net/vb/audi-s4...ld-thread.html

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    Iceash's Avatar
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    I had a D shaped one, changed surprise surprise. All works lol :-D

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    B5 BIKER's Avatar
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    Good stuff, I had to change mine on my old A4, even my A6 now needed one also so it must be fairly common.
    Both sides were shot, needle used to jump around and the ecu sensor also it used to make the engine run uneven and bring on the esp light

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    Iceash's Avatar
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    Thankfully she behaved other than using a little more fuel. However when the one on the Polo failed it kept reving which was scary when trying to engine brake lol

 

 

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