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Discussion Starter #1
Hi can someone PLEASE help me

Got this bmw 316i 2002 with n42 engine. Temp rises as normal to the 12 o'clock point and NEVER GOES BEYOND. However after 5-10 min driving, it spits out the litres of coolant when i open the cap. If i dont open, it will be releasing pressurized vapour poures out. The pipe going back to engine from radiator some always cool for some reason.

Can someone shed light?

Thermostat?
 

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First of all you need to bleed the cooling system.

How to bleed the cooling system.
1.Jack the front of the vehicle up onto stands as high as possible,
2.Turn the ignition on to Aux 2, Engine OFF, heater on fan setting 1 and temperature fully hot,
3.Remove the rad cap/expansion cap,remove the bleed screw from the radiator and IF you have them the bleed screw(s) from the thermostat housing/top hose, return pipe or EGR thermostat.
4.Fill the radiator/expansion tank up and keep pouring till there are no more air bubbles coming out from the bleeds, using a funnel that fits tight in the expansion tank neck and filling it full of water will help push any troublesome air out, when good you can then install the bleeds and tighten down(don't snap them),ensure the rubber O-rings/seals are still on the screws/on the bleed holes.
5.Suck some water out so it's not full to the brim, start the car up and check coolant shoots out of the small hole on the inside of the expansion tank neck when the revs are held up, if it does then replace the cap and then run the car up and check for heat from the vents when the car is warm, then carry on and check if over heating still persists. You may have to bleed troublesome cars again afterwards.(but very rare).
6.If all is good then check the water level again in the morning when cool.

or

Ignition on, heater set to hot, bleed screw out.
Pull the top hose off the radiator. Pour coolant SLOWLY down the rad hose a litre at a time. When the coolant is building up in the hose, hold it above the level of the rad hose stub and keep adding it. When coolant starts to dribble from the rad, refit the hose. You may find that coolant starts to overflow from the rad cap orifice - if it does, just screw the cap back on. Once you've done that, the engine and radiator are full of coolant - the little air pockets that might be left will come through the bleed screw.

After the vehicle is bled you should check that when the revs are held up you get a flow of coolant shooting out of the hole in the inside of the expansion tank neck, this will help tell you if the water pump is circulating, then run the car up and check the lower radiator hose gets hot. You could also get a "block test" performed to tell you whether the headgasket has gone.
 

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Discussion Starter #4 (Edited)
bubles keep coming out while the engine is off as the heater matrix is pumping water.so definately not headgasket. the engine is stone cold but it spits out the water. does the steady stream into the expansion tank only flow when the thermostat opens? i ran it for about 5 min but didnt see the stream. Instead, when i loosen the bleed screw near the engine, coolant is pushed out from radiator cap whether engine is hot or cold
 
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