1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Engine temp problem...

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Mr.Sline, Jan 26, 2014.

  1. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Jan 26, 2014]
    Hi all,

    Problem I have is the car is taking longer than average to warm up, during this process with the
    blower on low and on max temp and if I'm in traffic the temp will go down back to cold.

    Once warm on 90degrees again if in traffic or stationary the temp will drop down again.


    I have changed the thermostat with a genuine replacement, filled the cooling system with
    antifreeze/water and blead accordingly...the problem is still there

    So I have also changed the engine coolant temperature sensor, lost a few litres of coolant so
    repeated the process of filling the coolant and blead again.

    Unfortunately the problem still persists!

    Any advice/feedback will be appreciated
    Many thanks
    Car in question is a Audi A4 2.0 tdi sline 2007 B7
    Last edited: Jan 27, 2014
    #1
  2. Ads

    Ads

    [Oct 31, 2014]

  3. V6 Quatt
    Online

    V6 Quatt Active Member

    Joined:
    Feb 29, 2008
    Messages:
    885
    Likes Received:
    143
    [Jan 26, 2014]
    May be temp sensor?
    #2
  4. Craig Cull
    Offline

    Craig Cull Well-Known Member

    Joined:
    Oct 9, 2011
    Messages:
    1,349
    Likes Received:
    250
    [Jan 26, 2014]
    I had a similar problem when bleeding mine last week. I found it had an air lock. I left it running for a while, turned it off, then left the top off the coolant and let it bleed its self, when I came back out the water had sunk to the bottom, I then filled it up, fired it up and continued to bleed as normal. Heaters got warm and the problem was solved. Took me nearly 2 hours like but it's worth a blast
    #3
  5. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Jan 27, 2014]

    Change it again?..
    #4
  6. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Jan 27, 2014]

    Iv more or less blead the car with the process you mentiioned...
    but worth another try...
    #5
  7. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Jan 28, 2014]
    Blead the cooling system again still the same...
    It takes average time for the car to warm up to 90degrees
    providing the blower is off, with them on and stationary it will fall down
    to 60degrees but what i find strange is the heaters are blowing piping
    hot air all around the cabin regardless of the temp.
    The rad hose is not getting as hot as it should and the thermostat housing is
    cool...
    #6
  8. joinerman
    Offline

    joinerman Active Member

    Joined:
    Jun 30, 2013
    Messages:
    687
    Likes Received:
    66
    [Jan 28, 2014]
    Thermostat in wrong way round !!!
    #7
  9. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Jan 29, 2014]

    Lol i wish it was!
    Its defiantly in the right way!
    Last edited: Jan 29, 2014
    #8
  10. Giosabcsl
    Offline

    Giosabcsl Active Member

    Joined:
    Mar 23, 2013
    Messages:
    546
    Likes Received:
    106
    [Jan 30, 2014]
    May be worth noting that there are 2 cooling sensors. One is green the other is grey.

    Best scan the car if you can and see if anything is coming up.
    #9
  11. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Feb 1, 2014]
    Iv had the car scanned no codes, apart from my parking sensors as one has given up.

    I assumed there is only one coolant sensor on the back of the block?...cannot find another one...

    Water is not circutlating around the block im now assuming my water pump is weak and looking into that..
    #10
  12. Mike B
    Offline

    Mike B Member

    Joined:
    Jul 10, 2007
    Messages:
    794
    Likes Received:
    8
    [Feb 1, 2014]
    There s/b another sensor on the rad to control the fan but that wont be your prob.Thing is if the engine is warming up in a reasonable time not overheating and the heater is 100% then all is as it should be apart from the gauge itself.These are not accurate devizes
    #11
  13. Mr.Sline
    Offline

    Mr.Sline New Member

    Joined:
    May 4, 2012
    Messages:
    18
    Likes Received:
    0
    [Feb 2, 2014]
    Agreed, but the the engine is staying cold, the lower pipe coming off the rad and leading onto
    the thermostat is always ice cold even after driving for a few hours the water is not circulating
    and the engine is luke warmish...not hot as it should be
    jus came back from the garage...changed the waterpump and while i was at it changed the
    timing belt aswel...so new water pump, thermostat and cooling temp sensor...
    going to send the radiator off to get flushed out on monday and pressure tested...
    will post results...
    #12
  14. Craig Cull
    Offline

    Craig Cull Well-Known Member

    Joined:
    Oct 9, 2011
    Messages:
    1,349
    Likes Received:
    250
    [Feb 2, 2014]
    Hope you manage to find the problem mate :/
    #13

Share This Page