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Thread: Overheating / Coolant issue! Need advice!

  1. #1
    Join Date
    Apr 2013
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    Overheating / Coolant issue! Need advice!

    Hi all - I need some help!

    I have a Smart Roadster...
    The other day i was driving home and my overheating light came on. Got home and saw i had zero coolant! I topped it up and then it was all good... for a couple of days. Then it happened again. Coolant had drained.
    Now, I can't see that there is a leak anywhere to start with.
    Although, the engine fan doesn't seem to be coming on either now.

    Someone advised it could be the thermostat sensor causing the problem.. so the fan doesn't know when to kick in and the coolant is being heated up and then disappearing!

    Can anyone help?
    Thanks all!

  2. #2
    Join Date
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    Most likely you have a leak from the thermostat/housing &/or waterpump/housing - requiring the offending article to be replaced.
    Quite a common issue.
    You don't think there's a leak because the leak only happens when the engine is running and the coolant evaporates on the hot engine block leaving little or no evidence of there being a leak when you look on your drive or in the engine bay.

    You need to run the car up to temperature then stick it on a ramp and have a look.
    ==============================
    2004 Roadster-Coupe SB2 Brabus
    2005 ForTwo Brabus Numeric
    2014 Skoda Yeti 4x4 DSG
    ex 2002 City Coupe 600cc Pulse
    ex 2003 City Coupe 700cc Passion
    ==============================

  3. #3
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    Thanks for the reply - i will certainly check this.

    Although, what would be the reason for the fan not kicking in?

  4. #4
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    Are you sure it's not kicking in? What temp have you run it up to?
    ==============================
    2004 Roadster-Coupe SB2 Brabus
    2005 ForTwo Brabus Numeric
    2014 Skoda Yeti 4x4 DSG
    ex 2002 City Coupe 600cc Pulse
    ex 2003 City Coupe 700cc Passion
    ==============================

  5. #5
    Join Date
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    Quote Originally Posted by DarkMOD View Post

    Although, what would be the reason for the fan not kicking in?
    Sensor in air not water.

  6. #6
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    Well, i've ran it to the point it over heats i guess.

    Am i right in thinking the ForTwo and ForFour have a engine temp on the dash, but the roadster doesnt?
    How can I know what temp it goes up to?

    Thanks

  7. #7
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    I take it you don't have the "pods" then (on top of the centre console)? If not you'll need an ODB logger to see what temp it's running to.

    I would tend to agree with Pinger - fix the leaks then determine if the fan doesn't cut in...
    ==============================
    2004 Roadster-Coupe SB2 Brabus
    2005 ForTwo Brabus Numeric
    2014 Skoda Yeti 4x4 DSG
    ex 2002 City Coupe 600cc Pulse
    ex 2003 City Coupe 700cc Passion
    ==============================

  8. #8
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    Apr 2013
    Location
    Portsmouth
    Posts
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    Thanks for the reply guys.. I'll look into this. Appreciate it!

    One question though.. If the coolant was empty and the engine ran until it overheated.. Wouldn't this be enough to kick the fan in? I mean I assume the fan kicks in when the engine reaches a certain temp.. So if the overheating light comes on, surely it has reached the max temp and the fan should kick in?

    Sorry, I'm new to this so just trying to work it out!

  9. #9
    Join Date
    Nov 2007
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    I suspect you have already blown you head gasket. Run a block test to confirm.
    Drives a Smart Cdi - 65 to 85 MPG

  10. #10
    Join Date
    Apr 2011
    Location
    Cape Town (South Africa)
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    161
    Replace the relay for the engine fan first. My car started overheating and the boiling water exited now out the front of the car above the radiator. Replaced the engine fan relay and voila, car self regulated itself again, no 4 dots and no more coolant loss. My radiator fan was also not turning on, I assume the expelled water came from an overflow exit.
    Last edited by Minimike20; 04-11-2015 at 08:30 AM.


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