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VS V6 Ecotec overheating!

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by Tr3nchy, Aug 7, 2018.

  1. Tr3nchy

    Tr3nchy New Member

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    I realise this has been similarly posted before but I’ve been through them all and wanted some personalised advice.

    My 1996 VS Equipe, is overheating, guy that owned it before me had removed thermo-fan relay and placed a switch from fuse box to dash, it worked well but is really annoying to remember to turn on and off.

    I have just replaced the thermostat and the relay and yet still it get hot (3/4 and still no fan) so I’m wondering as to where to look next? I thought maybe seeing as it worked with a switch into the relay slot in the fuse box but not with the relay that maybe there is an issue in the wiring between the fan and fuse box but I’ve not got much mech knowledge but am capable when told what I need to do.

    Hope that makes sense and someone can help

    Cheers
     
  2. evBenji

    evBenji Active Member

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    Did the fan work previously if u flicked the switch on off

    Does the fan come on when you run your air con... its meant to

    When i had over heating issues i think i bought a new ecu coolant temp sensor

    I also noticed the plug that went into the sensor needed the female contacts bent back up so the pins were making sufficient firm contact when plugged in

    Spray all your plugs with electrical contact cleaner too. Not spark plugs just the sensor electrical plugs
     
  3. VT&VX

    VT&VX Active Member

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    Remove the thermostat until you sort out the problem with wiring etc

    Relays may have the same number of pins and even the same pin configuration but you have to check the numbers marked near the pins to know if you have the correct relay that will switch the circuit as it should.
     
    Last edited: Aug 7, 2018
  4. Tr3nchy

    Tr3nchy New Member

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    Yeah the fan came on with the switch but no doesn’t come on with the aircon switch, I’ll check the plugs and pins and that sensor tonight :) thanks
     
  5. CCCMikey

    CCCMikey Active Member

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    Sounds normal for some VSes. (Mine's the same, fan kicks in at 3/4s mark.)

    IIRC there are two different models of temperature sender available for the VS, and one has a different resistance to the other. It only drives the gauge though, not the ECU. You and I probably have the model that over-reports the temperature.

    If you can find someone with an ALDL cable and the right software, you can check what value the ECU is seeing.
     
  6. woteva

    woteva NEED 4 SPEED

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    You can try this-
    Been a while since I have done it but I remember the fan coming on when doing the paper clip trick.
    It will rule out a problem.with temp sensors.
     
  7. EYY

    EYY Well-Known Member

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    Do not remove the thermostat.

    Does your a/c work at all? If not, it won’t make the fan come on.

    How have you verified that it’s actually overheating? The gauge senders can give false readings. I got a vr cheap because it was ‘overheating’. Changing the temp sender fixed it.
     
  8. Tr3nchy

    Tr3nchy New Member

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    Now that you’ve brought it upto I’m not sure if the aircon is working but I’m going to check all my fuses and that tonight, cause could just be the globe in the button that’s blown, I haven’t had a good chance to check the aircon fully.

    My basis on overheating is after a 5 min drive the gauge hits max and once you turn it off and get out you can smell it and feel the heat from 1 - 1.5 meters away from the car.

    Do you know roughly how much one of those senders would be to try that?
     
  9. Tr3nchy

    Tr3nchy New Member

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    I’d need a bit more details to know what you mean properly sorry
     
  10. EYY

    EYY Well-Known Member

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    Hi speed fan comes on when bridging pins 5&6 of the aldl connector under the steering wheel.

    It does this because the pcm goes into safe mode because it can’t communicate with the bcm properly when those two pins are bridged. That’s a good way to check so see whether the relay/wiring’s all intact and working.
     
  11. VS_Pete

    VS_Pete Donating Member

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    If you want to test the fans just pull the plug on the SENSOR ASM TEMP. COOLANT TO ECU that is the big sensor turn reds on the low speed fan should come on then after a short time the high speed fan should come on.
    It`s been awhile I`m sure that`s right.
    [​IMG]
     
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  12. Mr exhaust

    Mr exhaust New Member

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    Replace the temp sensor that turns fans on when at right temp if you disconnect this plug fans come on so check that it hasn't been disconnected or any more problems you can ring me 0467745961 Darrin is my name
     
  13. VT&VX

    VT&VX Active Member

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    This V6 engine has the thermostat in an easy to access location and the waterpump is easy to get to as well.
    Just check out the previous Commodore engine (Nissan) or the one that came after (VE etc) and you will feel like you won the lottery.

    You can still test everything they suggest, just make sure the coolant is circulating. If the temp is still high in 5 minutes and the hoses feel hot and ready to burst, then you might have a stuffed water pump, impeller corroded away? (Only heard of one like that, you could be the second)
     

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