Your browser isn't supported
It looks like you're using an old web browser. To get the most out of the site and to ensure guides display correctly, we suggest upgrading your browser now. Download the latest:

Welcome to the MSE Forums

We're home to a fantastic community of MoneySavers but anyone can post. Please exercise caution & report spam, illegal, offensive or libellous posts/messages: click "report" or email forumteam@. Skimlinks & other affiliated links are turned on

Search
  • FIRST POST
    • leedom
    • By leedom 7th Nov 18, 6:34 PM
    • 44Posts
    • 3Thanks
    leedom
    Overheating...still cant find out why
    • #1
    • 7th Nov 18, 6:34 PM
    Overheating...still cant find out why 7th Nov 18 at 6:34 PM
    ongoing issue with my insignia....overheats when driven for more than 30mins/or harder eg uphill


    it has a new radiator and expansion tank, told water pump is working...no smokey exhaust or milky oil...heater working - although it seems to get warmer more quickly and the heater when on high it is very hot?


    probably gonna have to take it for a 2nd opinion but wondered if any ideas? thanks
Page 1
    • wgl2014
    • By wgl2014 7th Nov 18, 6:40 PM
    • 922 Posts
    • 583 Thanks
    wgl2014
    • #2
    • 7th Nov 18, 6:40 PM
    • #2
    • 7th Nov 18, 6:40 PM
    Stuck thermostat not opening fully?

    (Although they should fail 'open' to prevent this)
    • ratrace
    • By ratrace 7th Nov 18, 6:46 PM
    • 675 Posts
    • 458 Thanks
    ratrace
    • #3
    • 7th Nov 18, 6:46 PM
    • #3
    • 7th Nov 18, 6:46 PM
    is the fan working does it cut in and out to control the engine temp check that it maynot be working
    People are caught up in an egotistic artificial rat race to display a false image to society. We want the biggest house, fanciest car, and we don't mind paying the sky high mortgage to put up that show. We sacrifice our biggest assets our health and time, We feel happy when we see people look up to us and see how successful we are”

    Rat Race
    • Ganga
    • By Ganga 7th Nov 18, 6:46 PM
    • 1,353 Posts
    • 712 Thanks
    Ganga
    • #4
    • 7th Nov 18, 6:46 PM
    • #4
    • 7th Nov 18, 6:46 PM
    Do not take the thermostat out and leave it out as some engines have a by-pass thermostat and it needs to be in,you could take it out and put it in a pan of boiling water to see if it functioning.
    ITS NOT EASY TO GET EVERYTHING WRONG ,I HAVE TO WORK HARD TO DO IT!
    • leedom
    • By leedom 7th Nov 18, 7:01 PM
    • 44 Posts
    • 3 Thanks
    leedom
    • #5
    • 7th Nov 18, 7:01 PM
    • #5
    • 7th Nov 18, 7:01 PM
    Stuck thermostat not opening fully?

    (Although they should fail 'open' to prevent this)
    Originally posted by wgl2014

    if it was stuck closed would the heater in my car work - and if so would that be why the heater is very hot ie it isnt being cooled/ regulated?
    • leedom
    • By leedom 7th Nov 18, 7:07 PM
    • 44 Posts
    • 3 Thanks
    leedom
    • #6
    • 7th Nov 18, 7:07 PM
    • #6
    • 7th Nov 18, 7:07 PM
    is the fan working does it cut in and out to control the engine temp check that it maynot be working
    Originally posted by ratrace

    been told fans are ok
    • leedom
    • By leedom 7th Nov 18, 7:08 PM
    • 44 Posts
    • 3 Thanks
    leedom
    • #7
    • 7th Nov 18, 7:08 PM
    • #7
    • 7th Nov 18, 7:08 PM
    is the fan working does it cut in and out to control the engine temp check that it maynot be working
    Originally posted by ratrace
    fan cuts in
    • Norman Castle
    • By Norman Castle 7th Nov 18, 7:48 PM
    • 7,556 Posts
    • 6,311 Thanks
    Norman Castle
    • #8
    • 7th Nov 18, 7:48 PM
    • #8
    • 7th Nov 18, 7:48 PM
    if it was stuck closed would the heater in my car work - and if so would that be why the heater is very hot ie it isnt being cooled/ regulated?
    Originally posted by leedom
    Yes to both. If the thermostat is stuck shut you are cooling the engine through the heater. Depending on the car they can be very cheap and easy to replace.
    Don't harass a hippie. You'll get bad karma.

    Never trust a newbie with a rtb tale.
    • arcon5
    • By arcon5 7th Nov 18, 7:54 PM
    • 13,630 Posts
    • 8,641 Thanks
    arcon5
    • #9
    • 7th Nov 18, 7:54 PM
    • #9
    • 7th Nov 18, 7:54 PM
    Thermostat should have been the first port of call not the last.
    • atrixblue.-MFR-.
    • By atrixblue.-MFR-. 7th Nov 18, 8:01 PM
    • 6,608 Posts
    • 4,570 Thanks
    atrixblue.-MFR-.
    could be as simple as a air pocket. You said that the rad was replaced, It could be possible the garage didnt bleed all the air out properly and theres a air pocket trapped in there near the head temp sensor or water temp sensor and causing a overheat issue. Go back and ask them to bleed the system to elimante it.


    There are several things that can cause what your describing, but i would start with the simple basics that rads been replaced, could be a possible air pocket. Once this is eliminated, then you know the rad isnt the issue and a stuck thermostat shouldnt cause this issue as there is if memory serves there is a bypass, (unless someone modified the thermostat housing or blanked off the bypass) but for the sake of elimination you could replace it with new one.



    You say there is no white cloud of smoke and no milky oil but this does not rule out a faulty headgasket as water could be leaking from a water gally or port and dribbling down the rear front or sides of the engine.
    As the engine is unknown at this time, as to what work has been done to it in its lifetime, you never know that a previous garage could have changed a timing belt and water pump caked up the water pump mating surface with sealant (big no no never ever do it) and that sealant has flowed intot the internal passages for the water and blocked one up causing overheat.


    Basics first, have it bled again.
    Last edited by atrixblue.-MFR-.; 07-11-2018 at 8:03 PM.

    • foxy-stoat
    • By foxy-stoat 8th Nov 18, 8:50 AM
    • 3,016 Posts
    • 1,693 Thanks
    foxy-stoat
    Thermostat should be changed ASAP - why was the radiator and expansion bottle replaced?
    • foomanchu
    • By foomanchu 8th Nov 18, 9:30 PM
    • 60 Posts
    • 26 Thanks
    foomanchu
    You can check for stuck thermostat; from cold with the engine idling you can often feel the rad hose return to engine does not get hot. If the fans cut in before the return hose gets hot, good chance it's a stuck thermostat. Pretty easy and cheap to change I'd question why it wasn't done at same time as radiator. Bleed worthwhile too.

    If that doesn't do it you might have a head gasket failure. This doesn't always lead to mixing of oil/water but can be as simple as high pressure cylinder forces bubble into coolant effectively causing an airlock or forcing coolant out. You can't always see milky oil or bubbles in coolant, but there are chemical kits that will test for exhaust fumes in coolant, which will tell you for sure if this is the issue.
    • Houbara
    • By Houbara 8th Nov 18, 9:33 PM
    • 3,988 Posts
    • 2,594 Thanks
    Houbara
    I remember running a low mileage Vauxhall Cavalier for around 2 years with water leaking away somewhere unknown making the engine slightly over heat sometimes if I did nt top up constantly . Eventually one day it would nt start, after an 800 mile run to Cornwall and back , so took a plug out and when it was pushed in gear water spurted out of the plug hole.
    Surprisingly just replacing the head gasket for £10 cured it. Drain and refilled ( after an engine flush )
    the oil/water mix and it ran perfectly well for another couple of years.
    There was no signs of any water leaking out at all because it was leaking from the water holes through the head escaping into the engine, but the engine seemed to like having a bit of water in it and sounded good
    • Geodark
    • By Geodark 9th Nov 18, 12:48 PM
    • 861 Posts
    • 578 Thanks
    Geodark
    Water Pump? Thermostat? blocked radiator? HGF? (doesn't always show as milky stuff), could me many things. As said though first point of call should be the thermostat.
    • Robisere
    • By Robisere 10th Nov 18, 12:13 PM
    • 2,435 Posts
    • 3,284 Thanks
    Robisere
    If all the possible faults above have been checked and found to be OK, there may just possibly be a problem with the Heater Matrix, a small radiator which lives under the dash near the floor and provides heating from piping passed through from the cooling system. This is controlled by the heating controls on your instrument clusters: it sometimes blocks with sediment, being the lowest point of coolant flow.
    I think this job really needs
    a much bigger hammer.
Welcome to our new Forum!

Our aim is to save you money quickly and easily. We hope you like it!

Forum Team Contact us

Live Stats

373Posts Today

5,029Users online

Martin's Twitter