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Temperature gauge fluctuating - Thermostat?

Kev Boy May 12, 2018

  1. Kev Boy

    Kev Boy Member

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    hi all,

    Tonight while driving along my car started to drop it’s temperature on the gauge. It was fluctuating gradually down and then back up over the course of a 200 mile journey but didn’t make a noticeable difference in performance...

    It never dipped below 70 or raised above 90. No leaks or anything from the radiator.

    Is this the thermostat? If so how big a job is it? And how much would I be looking at for a garage to fit?

    It’s a 2007 3.0 TDi V6 (240bhp) engine.

    Thanks,

    Kevin.
     
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  3. jamiewatkins2004

    jamiewatkins2004 Active Member

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    Yeah I’d say change the thermostat and temp sensor while you’re at it.


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  4. Brian wright 5

    Brian wright 5 New Member

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    Hi i had this with my 2.0tfsi. When stationary the temp would go up to 90 but when u drive it drops down. Put a new stat on and now runs bang on the 90 mark and does not budge. Get a genuine stat though as some after market ones are prone to leak. Part was about £40 from audi and took me about an hour to fit.
     
  5. Paul battams

    Paul battams Member

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    [​IMG]
    It’s a pretty big job I just took front end off mine and did other stuff as well while I was in there water pump is right next to it if it’s never been changed!!!!



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  6. Kev Boy

    Kev Boy Member

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    Aw right. That isn’t so bad. Is it an easy enough diy job or is it best to put it to a garage for the thermostat?

    Don’t know what’s best about water pump. There are no receipts for it but the car has done 128k.
     
  7. Paul battams

    Paul battams Member

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    All depends how confident you are with spanner’s you can just take the front bumper off and get some longer bolts and leave the front panel on and draw it forward so you don’t have to spilt power steering and A/C it’s tight but doable mines on 170k so I just did fuel pump belt and tensioner aux belt and tensioner and bottom pulley.
    If you do water pump get one with metal fins not the plastic ones they can spin after a while good luck bleeding coolant system I had a pig of a job with mine.
    As for a price for thermostat I was getting told 4 hrs labour if anyone would take it on so just did it myself over 2 days.


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  8. Nigel Gough

    Nigel Gough New Member

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    I have a 2007 B7 3.0 TDi with 135,000 miles and currently when on the motorway cruising at 65-75 mph the temperature gauge fluctuates to over 100, goes into limp mode so I slow down and the temperature quickly returns to 90 and limp mode turns off. On a couple of occasions the coolant level warning light has come on, too. (The actual coolant level is fine.) The engine doesn't appear to be overheating either. Another thing is that the cabin heater only blows cold...
     
  9. Paul battams

    Paul battams Member

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    Have you done anything to it changed coolant temp sensor or thermostat???
    Mine ended up been an electrical problem as well check if you have a live with ignition on on the MAF sensor blue wire I think.


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  10. Nigel Gough

    Nigel Gough New Member

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    Thank you, Paul.
    I get the feeling that it might be the water pump. Never have any issues when driven lightly. The problem only arises when on motorway at 60-70 mph. Audi specialist in Warwick came up with the following error codes:
    P1018 Intake Manifold Flap 2 has lower limit not reached
    P3135 Intake Manifold Flap for flow control lower limit not reached..
    Is it true that main dealer code readers are able to search for more errors than a specialist?
     
  11. Paul battams

    Paul battams Member

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    Manifold flaps are common you can get an arm that sometimes repairs it cheap.
    As for diagnostic I’m not sure I’ve got my own vag com and get fairly well into what I need to know.
    There’s some clever people on here that will know more than me hope you get sorted.


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  13. Nigel Gough

    Nigel Gough New Member

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    Thanks for the swift reply,
    Kind regards

    Nigel
     
  14. Dan_Avant

    Dan_Avant Active Member

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    Having exact same issue on my 2.0tfsi BUL. Got a new stat and CTS just no time to fit it and I’m not paying garage labour prices for something I can do myself!
     

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