Thermostat fan on after engine turnoff?
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  1. #1
    Fellow Frogger! Atan's Avatar
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    Default Thermostat fan on after engine turnoff?

    Just noticed it todya. When I turned off the engine, the thermostat fan started whirring for awhile. I waited for a minute or two and it was still whirring so I started the engine and idled for a few seconds and turned off the engine, no more whirring fan. Is that normal for the fan to turn on after shutdown or is something strange happening? Would the fan have turned off if I waited a bit longer?

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  2. #2
    Fellow Frogger! 604 tragic's Avatar
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    Quote Originally Posted by Atan
    Just noticed it todya. When I turned off the engine, the thermostat fan started whirring for awhile. I waited for a minute or two and it was still whirring so I started the engine and idled for a few seconds and turned off the engine, no more whirring fan. Is that normal for the fan to turn on after shutdown or is something strange happening? Would the fan have turned off if I waited a bit longer?
    Yep - quite a few cars do this, Honda & SAAB are the main ones.
    They have a relay with a timer which turns on the fan to compensate for the heat spike just after a 'hot' engine is shut down. When the relay gets old it will play up and flatten your battery.
    So many projects - so little time.

  3. #3
    Fellow Frogger! Atan's Avatar
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    Thanks. I will keep an EAR on it to see if it is happening more frequently (if relay is getting old) Any idea of cost of replacing relay for a S16 - anyone done one?
    2007 VW Jetta 2.0 TDi 6sp manual

    2001 VW Bora 4-Motion - flooded away
    1998 Peugeot 406 SV manual - Gone to Hail Heaven
    1994 Silver S16 - Gone
    1983 505 Sti - Gone to good home

  4. #4
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    A couple of bucks for a relay. The 19 does the same thing. It's the anti perculating relay i think.

  5. #5
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    A relay incorporating a timer IC won't be a couple of bucks!


    2003 PEUGEOT 206 GTi

  6. #6
    Moderator Alan S's Avatar
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    I've heard of some Pugs having this feature and was told it's controlled by whatever controls the fans turning on such as (in a Cit) the thermo fan swirch.
    This to me is logical as it will simply turn off when it pulls the temp below triggering temp but can't say if this applies to your model.



    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  7. #7
    Fellow Frogger! Atan's Avatar
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    Alan

    It's only happened once so it could be as you described. Will be paranoid for awhile and listen for any more instances
    Alex
    2007 VW Jetta 2.0 TDi 6sp manual

    2001 VW Bora 4-Motion - flooded away
    1998 Peugeot 406 SV manual - Gone to Hail Heaven
    1994 Silver S16 - Gone
    1983 505 Sti - Gone to good home

  8. #8
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    The ol Hyundai kept running till it cooled down...

    Havent run the RSC during a real hot period yet...

  9. #9
    Fellow Frogger! ajpolden's Avatar
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    Wow...
    I wish i had this problem, i have discovered this summer that (i suspect) the coolant temperature switch for the radiator fans is dicky, the car reaches overheat temperature (no temperature dial in my model, just a warning light!) before the fans run. That means i've gotta keep the car moving on a hot day!
    Is the temperature switch the likely cause of the problem, and if so are they easily obtainable?
    Thanks, Andrew.
    Current:
    1999 406SV (D8)
    Previous:
    1986 BX19GT

  10. #10
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    could be the relay as was the case in our R19

  11. #11
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    Quote Originally Posted by Stuey
    A relay incorporating a timer IC won't be a couple of bucks!
    Fair enough. but from the wreckers it is.
    Yes, a regular 50 amp diode prodected cost me $15

  12. #12
    Fellow Frogger! 604 tragic's Avatar
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    Quote Originally Posted by ajpolden
    Wow...
    I wish i had this problem, i have discovered this summer that (i suspect) the coolant temperature switch for the radiator fans is dicky, the car reaches overheat temperature (no temperature dial in my model, just a warning light!) before the fans run. That means i've gotta keep the car moving on a hot day!
    Is the temperature switch the likely cause of the problem, and if so are they easily obtainable?
    Thanks, Andrew.
    An easy test is to short out the coolant temperature switch (there are usually 2 wires going to the switch - just bridge them). The fan should come on then. If they do - suspect the coolant temperature switch. If no fans' it could be another problem like the relay.
    Switches should be easy to get - do some research & find out what other cars have that temperature switch - someone on this forum may know . Get it off eBay if you can.
    So many projects - so little time.

  13. #13
    Fellow Frogger! chris's Avatar
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    That's a moderately common fault on BXes, somewhere like Repco should be able to sell you a new one. Probably check that it's really the problem though, as suggested above.

    Chris
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