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Thread: Working temperature on 2.0 TDIe during winter time

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  1. Re: Working temperature on 2.0 TDIe during winter time 
    #21
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    I suppose that gauge is OK as this happen only when heating is on, ambient temp is below 10 degrees C and engine does not have any load (going downhill). Heating in cabin is OK all the way (anyhow, car has auxiliary heating. So when there is no heating from engine it switch on this auxiliary heating).
    I will monitor it these days, but, I had A4 with 1.9 tdi PD, and gauge was steady on 90 all the time, can go down but only when outside is 15-20 below 0.
    I dont like if something is wrong to take it as it is. I am new to the car, this is may first winter with it, maybe is normal like that, but will see these days (will try to contact somebody who has same car and engine).
    I only regret that I did not change that thermostat when I was doing timing belt. Good or bad it does not mettar. But next time will be different. This should be considered as consumable part.
    Audi A6 Sedan C6 2.0 TDIe 2011 Condor Grey metallic
     
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  2. Re: Working temperature on 2.0 TDIe during winter time 
    #22
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    I don't believe the thermostat should be considered a consumable part.
    5 years is nothing for a 'stat. I've driven 20+ year old cars on the original. I would say they outlast the coolant rad on most cars.

    Ian
    A4 B6 Avant Nogaro Blue
     
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  3. Re: Working temperature on 2.0 TDIe during winter time 
    #23
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    On my previous A4, thermostat failed on 180000 km and 7 years old car. It failed on summer time and I got similar issue, going downhill on ambient temperature of 30 degrees the gauge falling down (with A/C on). So, I am now on same km but car has 5 years, the coolant and everything other were original until timing belt change and now I have new original coolant G13, new original pump and new original small thermostat. I am thinking to change as well new original thermostat.
    Audi A6 Sedan C6 2.0 TDIe 2011 Condor Grey metallic
     
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  4. Re: Working temperature on 2.0 TDIe during winter time 
    #24
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    Novica - did you come to any conclusion on this?
     
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  5. Re: Working temperature on 2.0 TDIe during winter time 
    #25
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    Quote Originally Posted by necstandards View Post
    Novica - did you come to any conclusion on this?
    Yes, the engine is working like this. Good friend of mine had A4 (B8) with same engine and less mileage, he changed thermostat (both) and same thing happens. I will change thermostat on next timing belt change. I noticed that if the car is driven on highway on low temperatures the engine is maintaining its working temperature, I suppose that engine will not even reach working temperature if something is wrong. These are high efficient engines.

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  6. Re: Working temperature on 2.0 TDIe during winter time 
    #26
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    Have you actually performed any live data on the coolant temp? I wouldn't trust a dashboard gauge.....usually they read 'low', 'normal' or 'head gasket has gone'.

    Ian
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  7. Re: Working temperature on 2.0 TDIe during winter time 
    #27
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    Have you had the system vacuum bled to rule trapped air?
    Dan
    2009/2010 2.0 TDIe SE
     
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  8. Re: Working temperature on 2.0 TDIe during winter time 
    #28
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    @dan2485 I have not performed any vacuum bled. I suppose that if there were any air trapped will be untrapped after passed 32000km and 2 years. So far car is getting fast working temp, on highway is not losing temp at all, only happen when there is no load on engine and out temp is les then 10 deg C.

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  9. Re: Working temperature on 2.0 TDIe during winter time 
    #29
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    Hi, I know this is an old thread, but I am having the same problem with my A6 C7's CGLC engine. I recently changed the main thermostat but problem did not go away. Now I am thinking about changing the second thermostat (the one for EGR cooler), but before I do that I wonder if it's worth replacing the coolant temperature sender (G62).

    I logged temperatures of G62 and G83 using VCDS, temperatures for both sensors increased together. So I thought the main t-stat was stuck open causing cold coolant to go into the engine. Upon inspection of old t-stat, it did not look stuck open, and the replacement did not solve the problem. Meaning main t-stat probably wasn't the cause of problem. Could the second t-stat be stuck open causing cold fluid to go into the engine? What do you guys think? Has any one changed both t-stats and solved the problem?

    Thanks.
    Last edited by dcheng; 22-03-2022 at 03:43 AM.
     
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  10. Re: Working temperature on 2.0 TDIe during winter time 
    #30
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    Quote Originally Posted by dcheng View Post
    Hi, I know this is an old thread, but I am having the same problem with my A6 C7's CGLC engine. I recently changed the main thermostat but problem did not go away. Now I am thinking about changing the second thermostat (the one for EGR cooler), but before I do that I wonder if it's worth replacing the coolant temperature sender (G62).

    I logged temperatures of G62 and G83 using VCDS, temperatures for both sensors increased together. So I thought the main t-stat was stuck open causing cold coolant to go into the engine. Upon inspection of old t-stat, it did not look stuck open, and the replacement did not solve the problem. Meaning main t-stat probably wasn't the cause of problem. Could the second t-stat be stuck open causing cold fluid to go into the engine? What do you guys think? Has any one changed both t-stats and solved the problem?

    Thanks.
    I have same problem, I have replaced egr thermostat, main thermostat and non return valve, no difference so far.

    I don't think its normal, if coolant isn't up to temp the DPF won't regen.
     
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