1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. It's been bought to our attention that certain users are spamming new and existing users with links to their own websites. This is not permitted on VxON.
    Should you receive such a message, please report this using the 'Report' link you will find at the bottom of the message.
    Those users will then be dealt with accordingly.
    Dismiss Notice
  3. Use The Search Function That's what It is There For!
    The chances are that the post you are about to make has already been asked so USE the search function first! You can either search JUST this forum by clicking on the search button on the top right (under the page numbers) or click on the main search button that is on the top tool bar.
    This will save you time and stop the same duplicate posts from appearing.
    Dismiss Notice

[Frontera] radiator cooling fans 2.2 frontera b

Discussion in 'Antara, Brava, Frontera, Mokka & Monterey owners forum' started by robinshort93, Jan 6, 2012.

  1. robinshort93

    robinshort93 New Member

    Messages:
    1
    Likes Received:
    0
    Drives:
    discovery
    can someone explain the radiator cooling fan system.
    I am trying to find the temperature control sensor which activates the relays and then the fans. My frontera v reg petrol 2.2 has just had new head gasket and i am not happy about cooling fan operation.
    I cannot locate the fan sensor and i am told an ecu controls the fan operation. is this true and where is the fan temp sensor sensor and the fan ecu.
    thanks for help
     
  2. fronteratech

    fronteratech VXON Resident 4x4 and diesel specialist

    Messages:
    7,529
    Likes Received:
    481
    Location:
    manchester gt manchester
    Drives:
    Frontera
    controlled off ecu temp sensor you have a fan relay
     
  3. Rustdog

    Rustdog rustydog

    Messages:
    11
    Likes Received:
    1
    Location:
    bucks
    Drives:
    frontera
    I have the same problem, is there any way to wire cooling twin fan's to manual switch,if so can you tell me how yo do it,I have got the wire & switch.Thank's.
     
  4. kbs

    kbs Well-Known Member

    Messages:
    742
    Likes Received:
    105
    Drives:
    When he is not whinging
    Hi,
    Probably driven via ECU from temp gauge sensor.
    ECU then decides if the fan should run on or start after car is turned off.
    To prove its driven from that sensor, unplug the sensor and the system should fail safe by turning the fan on.
    Do not frig the sensor to make the fan run all the time as the ECU uses the sensor for other functions.
    If you want to override the fan(s), look for a relay but do not short this out as the controller may detect a fault, instead run you own fused feed from the battery to a new relay and connect the output of that relay to the fans. You then manually switch your new relay and the control system will be none the wiser.
     
  5. Rustdog

    Rustdog rustydog

    Messages:
    11
    Likes Received:
    1
    Location:
    bucks
    Drives:
    frontera
    Thank you,do you know witch way round the heater pipes go on the matrix?
     
  6. Vauxsqueeks

    Vauxsqueeks Member

    Messages:
    28
    Likes Received:
    2
    Location:
    Bucks, UK
    Drives:
    Frontera B, 2.2 DTi LWB
    HI,
    You have 2 temp sensors. Both located on the EGR valve housing which is located at the back of the head and is a bit of a cow to get to. the sensor on the left side ( off side ) with the single spade connector is the sensor that gives your dash gauge a reading. The one on the right which has a clipped plug ( 2 wire ) is the one that feeds the ecu and fan control.

    As the previous poster said - dont mess with the cooling system, you would be far better to make sure that it is working correctly rather than mess with what is there.

    This cooling system is a pressurised system and will not work correctly if there is a leak. The 2.2 petrols are not great for cooling if the system is not 100%, this will lead to overheating and then on to head gasket replacement. As you said that just had one done. it would be good to do a health check to save the next one!

    What to check..

    1. All pipes are in good order, not aged, split or leaking. if they are replace them.
    2. The yellow cap from the expansion bottle:
    [​IMG]
    Make sure this has a 6-8 inch pipe attached that reaches down inside the expansion bottle almost to the bottom.
    As the car heats up it will blow hot water out into the expansion tank, when cooling it will suck coolant back into the radiator. This is how it remove any airlocks in the system. If there are airlocks then the car cannot cool properly and will overheat and your back to a new head gasket and warped head.

    3. There is a main water supply pipe that is bolted onto the bottom of the inlet manifold chamber by 1 bolt and 1 nut. Be exceptionally careful with this pipe:
    [​IMG]

    The small feed pipe on the right usually breaks off. If this happens replace the whole pipe no questions. It is not cheap.. do not repair them. Epoxy, ptfe tape and copper pipe is no substitution. It may be a quick cheap fix but it will leak ( in time ), airlock your cooling system, over heat and your back to a new head gasket. If yours has been repaired - replace it with a new one. It will kill your engine sooner or later if not.

    4. Once the system is blead out, ( air locks removed )**** do not remove the rad cap ****
    if you want to check the coolant level, look in the expansion tank. It is marked with a "MIN" and "MAX" levels. That is where you check it, not in the radiator. By removing the rad cap you only allow air into the system and the engine will have to get that out before it can cool properly again. When bleeding, filll up the expansion tank to "MAX" mark described above. Run the engine on a fast idle until the fans kick in. Then switch off and wait for the engine to go *cold* ( several hours ). Top up the coolant to the MAX level and repeat. You should not need to do this more than 2 or 3 times.

    The thermostat opens at 92 degrees. When this happens you will probably find that your heater goes cold until it closes again. You may also see the temp gauge rise to 100 or just over before the thermostat opens. This is quite normal and nothing to worry about. You will probably find that the temp gauge actually reads higher than the actual water temperature and the 2.2 can run anywhere from 86-100 degrees is quite normal, though it will usually settle around 90 degrees as an average once warm.

    With regards to Antifreeze a Super OAT type is fine (orange), I usually mix up the 5 year type to 50-50 though I have 60-40 in mine and it has been more behaved since then. Do not mix antifreeze types.

    The feed pipes to the matrix, bottom pipe is feed and the top pipe is the return.

    As you just had the head gasket done, I assume that the garage had the head skimmed, put new oil and filter in?

    For Information:
    Also I have noticed that a large proportion of these that go have an unusually high oil pump failure not long after the head gasket is changed ( if they have not been replaced before ).

    Keep a close eye on your oil pressure light, if you see it flicker or stay on get it checked/changed straight away.





    Hopefully this explains the heating system and answers all your questions.
     
    Last edited: Mar 13, 2014
    fronteratech likes this.
  7. Rustdog

    Rustdog rustydog

    Messages:
    11
    Likes Received:
    1
    Location:
    bucks
    Drives:
    frontera
    Hi,thank you so much for your help.We have not had our frontera long we have found out since that the matrix was by pasted for some reason,we have done the matrix but he don't know witch way the pipes go,the two pipes from the engine are side by side how can you tell witch is the feed & witch is the return.I see you come from bucks the same as us,we are in Icford by Thame.I just wondered if there would be any chance we my be able to come & see you if needed.Thank you for your help.Ruth
     
  8. Vauxsqueeks

    Vauxsqueeks Member

    Messages:
    28
    Likes Received:
    2
    Location:
    Bucks, UK
    Drives:
    Frontera B, 2.2 DTi LWB
    If I remember correctly, the one closest to the engine is the feed and the closest to the bulkhead is the return. I'll take a look at it and confirm.

    I am only about 10 miles away from Thame, (Aylesbury). Sure if you want to pop over that's fine (y)
     
  9. Rustdog

    Rustdog rustydog

    Messages:
    11
    Likes Received:
    1
    Location:
    bucks
    Drives:
    frontera
    Hi,Thank's for your help,I'v got one more problem with our frontera ,when you start up it rev's at 2500 when your driving the rev's don't go down between gear change the throttle cable is ok, could it be the fuel sensor if there is one, or can you shed a light on what's wrong. Thank's
     
  10. Vauxsqueeks

    Vauxsqueeks Member

    Messages:
    28
    Likes Received:
    2
    Location:
    Bucks, UK
    Drives:
    Frontera B, 2.2 DTi LWB
    could be one of several things.

    you may have a vacuum leak, split / blocked crank case breather pipe, leaky rocker cover gasket, faulty throttle position sensor ( or at least need re-calibrating). You may find that it is worse in warmer weather and not so obvious in the winter.

    As a temporary work around. when you start the car and the revs start to race just let it run for 30 seconds or so or until the revs normalise at about 700-800 then you should be ok. until next restart until its resolved.
    :)
     

Share This Page