HELP! My 306D cooling Fans will not come on, Engine overheating...

Discussion in 'Peugeot 306' started by 306hell, May 6, 2005.

  1. 306hell

    306hell Guest

    Hi, I have just bypassed my Heater matrix on my Pug 306 XND 94

    The two latge cooling fans will not come on, ewven though my temperature
    dial gets up to just below 100C before I have to turn off the engine to
    cool it.

    Any Ideas, I was thinking an air pocket or someting? They did work before
    I bypassed the heater matrix by joining In/Out pipes together.

    Any Help Greatly Appreciated!

    Mnay Thanks..
     
    306hell, May 6, 2005
    #1
  2. 306hell

    RooMonster Guest

    Hi,

    Does the raidiator get hot? If not, it could be a bust thermostat that
    is not allowing water to flow through it. Replace the thermostat.

    If the raidiator does get hot then it must be a problem with the
    electronic system; Temperature switch, Wiring etc.

    I don't believe it would be a air pocket restricting coolant flow, if
    it was the engine would rise in temperature very quickly (<2 mins). I
    assume you've let air out of system using the bleed screws?

    Richard
     
    RooMonster, May 6, 2005
    #2
  3. Years ago I bypassed the heater on an old Vauxhall Chevette and the same
    thing happened. It was because the coolant was not being cooled by going
    through the matrix. The answer was to connect the two hoses with a solid
    bar, instead of a piece of pipe, giving the same effect as when the heater
    is turned off and forcing the coolant to circulate via the radiator.
     
    Keith Willcocks, May 6, 2005
    #3
  4. 306hell

    RooMonster Guest

    Years ago I bypassed the heater on an old Vauxhall Chevette and the
    same
    On the 306, water constantly circulates through the heater matrix
    (there is no value in the 306 heater matrix). So adding a solid bar
    would completely block coolant flow.
     
    RooMonster, May 7, 2005
    #4
  5. You need to check whether your electric cooling fans are working.
    If on tick over they don't cut in and the engine overheats, then either the
    fans or the sensor is faulty.
    You can check the fans by bypassing the sensor to see if they operate.
    Make sure you don't have any loose clothing etc near by.

    If the fans work then the problem is with the sensor.
    On a 406 they are only about £5 each and fairly easy to replace.
    Not sure about the 306 though.
    Hope this helps.
     
    steve Robinson via CarKB.com, May 7, 2005
    #5
  6. 306hell

    Bob Minchin Guest

    306hell wrote in message ...
    Have you got aircon on this model? If so the fans should come on in series
    (slow mode) as soon as the aircon is switched on irrespective of the engine
    temp. If they don't work under this test ,suspect fuses, wiring and the
    three relays used for switching between off,series and parallel.
    If they work for the aircon then it could still be the above but also could
    be the sensor. Not familar with the diesel but it could well be near the
    water circulation thermostat housing.

    Bob
     
    Bob Minchin, May 7, 2005
    #6
  7. 306hell

    Bill Guest

    Well put - just to add and it would probably cause more trouble than its
    worth.
     
    Bill, Jun 18, 2005
    #7
  8. 306hell

    Bill Guest

    which two large cooling fans are we talking about here? I have 306. The
    fan on the switch on the fan needs checking first.

    Bill
     
    Bill, Jun 18, 2005
    #8
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