406 Stop light and warning tone - A/C?

Discussion in 'Peugeot 406' started by Brainfire, Mar 31, 2007.

  1. Brainfire

    Brainfire Guest

    My 2000 406 HDI has just started flashing the STOP light and sounding
    the warning tone when the A/C is on. There is no other indication of
    anything wrong at all. Would anyone have any ideas?

    TIA
     
    Brainfire, Mar 31, 2007
    #1
  2. Check your cooling fans are working properly.
    Mike
     
    Michael Roche, Mar 31, 2007
    #2
  3. Brainfire

    Brainfire Guest

    I'm slightly farther on with this problem - the fan is only coming on
    when the high pressure side reaches around 16 bar, and then only for a
    few seconds, enough to bring it down to around 10 bar, then the cycle
    continues. I don't know if the problem is one, two, or all of the
    three relays inside the plastic box, or the resistors that sit up
    beside the fan - anyone any ideas? I'm assuming the fan should be on
    all the time, is this correct?

    TIA
     
    Brainfire, Apr 20, 2007
    #3
  4. You seem to have only one cooling fan, the earlier 406 had 2 and used the
    circuit shown on the web site I mentioned.
    When air con is on you should have the fan running at slow speed to provide
    cooling for the air con rad.
    The relays you mention are used in conjunction with the resistors to change
    the voltage applied to the fan an hence the speed. They are a notorious
    problem, corrosion being the cause. You should be able to prove the
    resistors by
    1) a resistive check with and OHM meter with the connecting wires removed.
    2) with a volt meter connected across the resistors when in circuit you
    should see a voltage. You cannot get a volt drop across a resistor unless
    the circuit is made and current is being drawn..
    3) On my 406 disconnecting the thermostat that feeds the bitrol system
    causes the fans to first run at slow speed and then at fast speed. This will
    have the same affect as testing in 1 & 2 above but may give you more
    confidence in the result
    Mike.
     
    Michael Roche, Apr 21, 2007
    #4
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