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Thread: A6 won't warm up...

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  1. Re: A6 won't warm up... 
    #21
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    Does the c7 have flaps that open and close around the radiators or grills?i never looked.
    I know some Fords and other brands have them in their more efficient type cars and itís meant to help them warm up.

    Ps. The old 1.9tdi were brilliant. Had a pd130 with over 180k and all it had was a clutch, boost pipe and usual service items.
     
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  2. Re: A6 won't warm up... 
    #22
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    If the cardboard on the radiator fixes the problem then one must assume that there is hot water flowing through the radiator. If that is the case then the thermostat is at fault since the thermostat should stop the flow of water through the radiator until it reaches about 88C.

    Is the thermostat electrical or mechanical.
    Audi A7 Dakota Grey, 3.0TDi 2wd, engine CLAB, Gearbox NKP, Comfort seats, parking system advance, advance key, MMI Nav plus, MMI touch, HUD, Mob phone prep high with on-line services, heated sports steering wheel, folding mirrors, garage opener, fine grain ash inlays. 110k miles
    Audi Q5, 3.0TDi Sline Plus engine CDUC, adaptive headlamps, high beam assist, black inlays, advance key, TPMS, parking sys advanced, 45k miles
     
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  3. Re: A6 won't warm up... 
    #23
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    The good ole cardboard trick. Can't beat basic engineering They still do that in NASCAR, they vary the amount of duct tape to help adjust for temp.
    Before my '13 A6 I had a big American v8 and it struggled to get warm in the winter. Changed the thermostat and it was nice and toasty. However that car was much simpler to work on.
    My first thought as a result was that the a6 had a faulty thermostat, of which it sounds like there are two. I wouldn't even know where to start looking on the engine.
    There will always be some bypass of coolant as the thermostat doesnt create a complete seal, but it shouldn't be enough to cool the engine from operating temp, or prevent it from reaching operating temp. Thermostats are gradual, so they will start to open at around somewhere around 70 and as they open more, allow for an increased flow. This should also prevent the car from not being able to heat up, as if the small amount of coolant passing through is being cooled in freezing temps, it should keep the stat mostly closed and allow for optimal operating temp.
    I think the only way to solve it is to get members on the forum with the same spec car, to go for a drive at the same (one car that appears to work fine and another with a cooling issue). Have each car follow / drive side by side, have everything set to the same, on the mmi, same heater settings, drive the same, shift the same etc. One will reach temp whilst the other will struggle. Then we'll truly know if its super efficient engines or dodgy thermostats.
     
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  4. Re: A6 won't warm up... 
    #24
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    Exactly what I think , its an electric thermostat, but a new thermostat didn't fix this problem and I've heard this same story over and over again from other people trying to fix the problem by replacing the thermostat and it making no difference, that's whats making me think is it a software issue because no one seems to have an answer? My car has had 3 updates before I bought it 1st was for the power steering 2nd was for the air conditioning and 3rd was the dreaded emissions update.
    Last week in sub zero conditions the A6 C5 1.9 TDI after a long run the header tank and top hose we're both hot while it's radiator was cold but the A6 C7 the header tank was warm and the top hose was warm and also the radiator was warm which makes me think that the thermostat is always open.
     
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  5. Re: A6 won't warm up... 
    #25
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    If its is an electric thermostat then it will be fed from a temperature sensor. Check the temperature sensor as that could be faulty.
    Audi A7 Dakota Grey, 3.0TDi 2wd, engine CLAB, Gearbox NKP, Comfort seats, parking system advance, advance key, MMI Nav plus, MMI touch, HUD, Mob phone prep high with on-line services, heated sports steering wheel, folding mirrors, garage opener, fine grain ash inlays. 110k miles
    Audi Q5, 3.0TDi Sline Plus engine CDUC, adaptive headlamps, high beam assist, black inlays, advance key, TPMS, parking sys advanced, 45k miles
     
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  6. Re: A6 won't warm up... 
    #26
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    Audi to announce recall on 2.0tdi software issue.
    I came across this interesting article, it doesn't state our symptoms but it's quite possible it's the route cause, just as I was saying software issue in the updates.

    Click link

    Audi recall 2018 of 1.2 million A4, A5, A6 and Q5 cars over coolant pump issue | Cars | Life & Style | Express.co.uk
     
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