Question about 1996 BMW 318

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BMW 318 i se M43 engine

Just changed the head gasket got a new thermostat but now....
After bleeding the system it will start ok from cold and build up to half way (normal) but then it will slowly rise to just under the red and stay there????
doesnt over heat, bubble, loose coolant or over pressurise and the heaters are nice and warm??? please help

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  • usersteve83 Dec 01, 2008

    forgot to say the top radiator hose gets hot but the one coming from the thermostat housing to bottom of radiator stays cool?? i have water flowing from a hole in the header tank just under the filler neck, so water pump is working

  • Rami Fayez
    Rami Fayez Sep 20, 2017

    this is a stuck thermostat.

  • Rami Fayez
    Rami Fayez Sep 20, 2017

    which means no coolant circulation.

  • Rami Fayez
    Rami Fayez Sep 20, 2017

    just change thermostat with new and don't get an aftermarket one get the original.

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Dounds like maybe your thermostat is not openin properly. maybe slightly but not all the way . i had the same problem a year ago!

Posted on Jan 24, 2009

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The problem here based on what you have told me is that you have a cylinder head gasket leaking combustion gas into the cooling system, this creates gas pockets around the thermostat and delays it opening. You can try adding one of the many head gasket sealers available in auto parts stores. I suggest you contact a local NAPA or Carquest auto parts store and ask what they think really works, I' heard that many do work but have no 1st hand knowledge. To make sure air is not in the cooling system do the following, you will need a floor jack. If the problem persists you will need the head gasket replaced and the cylinder head checked for cracks and if it checks ok then machined flat again.



The generic method of bleeding air from the cooling system is to use a floor jack and raise the front of the car as high as possible, then fill the coolant recovery tank full and run the engine until it just starts to overheat, high end of normal zone on gauge, then shut the engine down and run cold water over the radiator core, this will self bleed the system and the coolant will be pulled from the recovery tank, repeat as necessary, never let the recovery tank run dry or more air will be pulled into the system.


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I have a 2001 nissan sentra 1.8 with 158,000 miles. Problem started a month ago,no heat while idling but when revved up or driving would have heat. Changed thermostat,bled system from bolt above thermostat...


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hi, the problem you are having is down to one of a couple of problems, now as you state the air blows cold then this points towards the thermostat not opening so this then dont pump the coolant round the engine resulting in the top half of the being hot and the bottom half cold so this is why you only get cold air.

so the first thing you should do is get the thermostat changed.

you also need to bare in mind that the problem could be a damaged water pump this does happen from time to time so check for any signs of water leak where the water pump is by the timing belt, if their is no signs of leak then the thermostat is the likely cause.

you also need to think that as the engine has over heated this could have caused the head gasket to fail so this will need looking at to if after changing the thermostat you have the same over heating problem.

so replace the thermostat as this has clearly gone and then when you re-fill the coolant make sure any bleed screws are undone if you have any on your coolant system usually located in one of the top hoses running around the engine, (not all coolant systems have one as many are self bleeding so dont worry if you dont see any bleed screws) now when you start filling the coolant up make sure you only trickle the coolant in to prevent any air lock building up in the system.

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hi, if you are changing the head gasket then it may be worth checking the water pump and thermostat as it could have been one of these that failed causing it to over heat and then blown the head gasket so check the water pump and thermostat once you have the cylinder head off.

You may need the head checking to see if it has been warped but this is unlikely on this make of vehicle.

Once you have done the gasket make sure that when you fill the coolant up you only trickle the water in to prevent any air lock as this will cause it to over heat again, check for any bleed screws on the coolant system to let the air out whilst filling the coolant up,

Its best you check in the workshop manual for these as their may not be none as it could be self bleed system.

It also worth checking if the head bolts need changing as they do stretch and can cause the gasket not to seal properly so replacing these may be a good idea.

Let me know how you get on or if you need further assistance ok.

ps what makes you think the head gasket has gone??

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