Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Vy Overheating issues

Discussion in 'VY Holden Commodore (2002 - 2004)' started by Amy Winslade, Feb 3, 2018.

  1. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    Hi everyone, I'm new to the forum. I have some questions about my car.

    I have a 2003 Holden vy acclaim. I have recently replaced alot of parts. Most recently the thermo stat, plugs and leads, air filter (switched to k&n) and the altenator.

    As of yesterday, my cars temperature sits where it always does, then as I drive around for a little while the temp goes up a little bit. Just below hot. Then if I stop anywhere, traffic lights etc, the temp drops back down to normal....

    I also noticed last night that even though I had used my air-con in the car that day, when I used it last night, the temp gauge instantly hit overheat. Turned the air-con off and the temp dropped but this time it only dropped to just below redline..

    My question is, what could cause this. Thermostat has been replaced, coolant was bled all done about a month ago... Etc etc

    Help pleaseeeee!
     

    Attached Files:

  2. Lex

    Lex Well-Known Member

    Messages:
    1,008
    Likes Received:
    217
    Trophy Points:
    63
    Joined:
    Sep 19, 2012
    Location:
    Geelong Victoria
    Members Ride:
    VT Executive S1 V6 Auto Wagon
    Hi
    Welcome to the forum.
    Maybe water pump? I'd start with that. I'm assuming radiator is good?
     
  3. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    Blonde moment. Didn't think of the water pump. That would be it is assume, radiator is fine as far as I know. Thankyou
     
  4. evBenji

    evBenji Active Member

    Messages:
    935
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    Dec 22, 2010
    Location:
    Adelaide
    Members Ride:
    VY Commodore
    could have air pockets in your coolant, give it a bleed maybe

    coolant temp sensor could be faulty and i would spray the plug with contact cleaner, in fact spray up all your sensor plugs clean off gunk

    radiator cap could be old but it would piss out your coolant, just something i would look at if was mine

    i personally would reset ecu take battery off for half hour, may or may not help
     
  5. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    I just bled the coolant. Was alot of air in there but I've noticed there's a bit of movement in the pulley to the water pump... Will try and upload a video of possible. Also how would I know if the radiator cap needs replacing? Any noticeable signs?

    Sorry for any stupid questions, Im Learning here so bare with me haha
     
  6. evBenji

    evBenji Active Member

    Messages:
    935
    Likes Received:
    46
    Trophy Points:
    28
    Joined:
    Dec 22, 2010
    Location:
    Adelaide
    Members Ride:
    VY Commodore
    just if the cap is old n crap. but its only faulty if you notice the radiator has dropped half your coolant on the road. its worth replacing for the long term but but only small chance it will fix your issue
     
  7. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    Thankyou evbenji..

    Don't think that's an issue. I have just disconnected the battery like you said to reset the eve. Will see how it goes later on otherwise it's looking like the water pump unfortunately.

    Thankyou for all your help
     
  8. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    Hi again everyone.

    Still having over heating issues.

    I have had the heater tap replaced as it was buggered and also the water pump. The coolant has been bled twice in the last fortnight in case of airlock bit that's not the case.

    Just wondering what else it could be? Could it be the coolant/water temp sensor?
     
  9. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

    Messages:
    13,718
    Likes Received:
    1,925
    Trophy Points:
    113
    Joined:
    Apr 15, 2006
    Location:
    Sth Auck, NZ
    Members Ride:
    HSV VS Senator, VX s2 Calais S/C
    Sorry to hear the problem hasn't been fixed.

    Seeing as you recently fitted a new K&N filter I would start by cleaning the MAF. Oiled type filters have a habit of contaminating the little wires inside the MAF that can make the engine run lean which will contribute to any overheating issues that may be present.

    It still sounds like there is an airlock in the system, try running the engine with heater on full hot preferably with the car parked on an incline with the car facing uphill. The radiator cap is a crucial part of the cooling system, as the system heats up the coolant expands and the radiator cap will allow some coolant to bypass it into the expansion tank to maintain the correct pressure and then once the engine is switched off as the engine cools a slight vacuum is created in the cooling system (as the coolant contracts) and the radiator cap will allow the coolant to pass back into the radiator from the expansion tank. Old or tired radiator caps tend to not seal the system 100% so they will allow the coolant to bypass into the expansion tank but don't seal well enough when things cool and instead will allow air to enter the system instead.

    Another possibility is that your new thermostat is faulty. Start the car and let it warm up. Monitor the top radiator hose and as the engine gets up to operating temp the top hose should heat up as the thermostat opens. If the thermofan comes on and the top hose isn't piping hot than the thermostat is probably faulty.
     
  10. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    Thank you for the advice I will try that and see how I go fingers crossed!!!!!
     
  11. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    Back again and I'm about to go insane. The same issue is happening. Cannot take to a mechanic to "diagnose" because I just do not have the money...

    Overflow tank has coolant (isn't over full) ... Coolant in the radiator also.

    Top hose is boiling hot but has ABSOLUTELY NO COOLANT in it and when the hose is removed steam comes out.

    There are no air locks.

    Water pump has been replaced

    Thermostat has been replaced multiple times and works. Has even been removed temporarily and still had the same issue.

    Bottom hose is full of coolant.

    Coolant is the correct colour.

    System has been bled properly multiple times.

    WHAT IS HAPPENING?!?!
    thank you everyone for your help.
     
  12. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

    Messages:
    13,718
    Likes Received:
    1,925
    Trophy Points:
    113
    Joined:
    Apr 15, 2006
    Location:
    Sth Auck, NZ
    Members Ride:
    HSV VS Senator, VX s2 Calais S/C
    Silly question but is the serpentine belt fitted correctly?

    Failing that it would suggest there is a blockage somewhere.
     
  13. Amy Winslade

    Amy Winslade New Member

    Messages:
    8
    Likes Received:
    0
    Trophy Points:
    1
    Joined:
    Feb 3, 2018
    Location:
    Victoria
    Members Ride:
    2003 Holden VY Commodore, 3.8l V6 ecotec sedan
    I neve
    I never thought of that. .. If it's worn or cracked or not fitted correctly this causes the water pump etc to not function as they should... Is that correct?

    And if it's not that would the next bet be the radiator?
     
  14. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

    Messages:
    13,718
    Likes Received:
    1,925
    Trophy Points:
    113
    Joined:
    Apr 15, 2006
    Location:
    Sth Auck, NZ
    Members Ride:
    HSV VS Senator, VX s2 Calais S/C
    If you have run the engine without the top radiator hose fitted with the engine up to full temp and no coolant has come out then there is a flow problem.

    The owners manual has a diagram of the correct routing for the serpentine belt.
     
  15. Gridlocked

    Gridlocked Member

    Messages:
    37
    Likes Received:
    1
    Trophy Points:
    6
    Joined:
    Nov 9, 2015
    Location:
    Brisbane
    Members Ride:
    VY II Berlina V6
    Thermo fans running when aircon is on? I've replaced several fans over the 14 years I've had my VY. Temp shoots straight up if the fans are inoperative. From memory it was the large fan that is always on when the aircon is running.
     
  16. lowandslow

    lowandslow Well-Known Member

    Messages:
    1,411
    Likes Received:
    171
    Trophy Points:
    63
    Joined:
    Dec 11, 2013
    Location:
    NSW
    Members Ride:
    V2 III Monaro
    Is there coolant in the top hose when it's cold? Stick a funnel in the top of the radiator, open the bleeder and top up with coolant until it is running out of the bleeder.
    You sure the thermostat hasn't been fitted arse about?
    Serpentine belt fitted the right way so it's turning the water pump the right way?
    I had a bit of trouble getting the air lock out of my V6. Needed the coke bottle trick at operating temp with the heater on hot to push all the air out of the bleeder.
     

Share This Page