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Engine getting too hot?

Discussion in 'Motors' started by nst68, 21 Jul 2006.

  1. nst68

    Wise Guy

    Joined: 7 Jul 2003

    Posts: 1,427

    Location: Chelmsford

    Advice needed please.

    The cooling fan on my car (406 diesel) isnt kicking in till the temp is about 75% of the way up on the guage (which sometimes means that its nearly touching the red before the fan starts to do the business).

    Is this normal, should the fan cut in sooner?

    Ta.

    Nelly
     
  2. big_white_dog84

    Wise Guy

    Joined: 8 Jan 2004

    Posts: 1,188

    Sounds OK to me. I wouldn't worry about it until it is reaching the red.
     
  3. agw_01

    Capodecina

    Joined: 11 Apr 2004

    Posts: 19,681

    Depends on the car really.

    I'd look in the handbook if you have one to check when the fan should cut in.

    It also depends on how sensitive the temp sensors are. Jumping up to 75% on the gauge in your car may only show 50% on the gauge in another car (if you get me).

    My gauge doesn't ever move, even up to the point when the fan cuts in.
     
  4. Bill101

    Soldato

    Joined: 18 Oct 2002

    Posts: 5,550

    Location: Liverpool

    Does that temp drop radidly once the fans start? if so there is no problem.In 10 years of driving a TD Golf the fans only ever came on once.
     
  5. agw_01

    Capodecina

    Joined: 11 Apr 2004

    Posts: 19,681

    Everytime the woman next door pulls into our estate in her 55 plate Focus TDCi, the cooling fans are running.

    :confused:

    Mine don't even come on sitting in slow traffic on the way home, and there's no traffic after you get off the main road leading to my house (about a mile away from the main road).
     
  6. Simon

    Capodecina

    Joined: 21 Oct 2002

    Posts: 23,953

    Location: Berks / Moscow

    If the aircon is on then the cooling fan comes on with it to cool the condensor.
     
  7. agw_01

    Capodecina

    Joined: 11 Apr 2004

    Posts: 19,681

    Ahhhhh. After posting, I just thought that it could be the aircon. :)
     
  8. Nathan

    Mobster

    Joined: 4 Feb 2003

    Posts: 4,651

    Location: West Midlands

    Its fine. My GTI is the same, you get worried dont you lol
     
  9. nst68

    Wise Guy

    Joined: 7 Jul 2003

    Posts: 1,427

    Location: Chelmsford

    Thanks for the replies.

    Managed to speak to my mechanic and he said basically the same as agw_01, with regard to diff sensors across diff cars.
    Main thing is that it is working.

    Cheers.

    Nelly
     
  10. L Plate

    Mobster

    Joined: 17 Oct 2002

    Posts: 2,695

    Location: Woolwich and Edinburgh

    just to add, some cars take the temperature reading for the guage from a different sensor to that which supplies the switching for the fan too ;)

    by that i mean that the temp guage may takes its signal from a thermostatic switch in the thermostat housing/area which is always going to read hotter than the radiator switch which controls the fan in a lot of cases, due to the direct cooling that the radiator receives.

    not always as straight forward, but there are plenty of engines out there that run that sort of configuration :)