Reply to thread

Click here to become an Official Member of BMW Club Malaysia Download Form

Message: <blockquote data-quote="c-square" data-source="post: 238176" data-attributes="member: 135">That seemed strange that if you re-fill and go, the water starts to boil again very quickly, as opposed to you letting the car cool down for 5-6 hours.  Well, my guess would be that at that time when you were outside and had to re-fill and go, some air pockets may have gotten trapped within your cooling system, thus you experienced "overheating" warning after only about 10 minutes of drive.  However, on your second attempt to re-fill and leave the car to cool down, the air pockets may have been luckily dislodged, thus your cooling system working fine up till today.  Normally, when I check and had to do a top-up of water in the radiator, I would also unscrew the "Bleeder Screw" and maintain a slow and smooth flow of fresh water into the expansion tank until all the bubbles are released out from the bleeder hole.  Continue to let the water over flow out of the little bleeder hole until no more bubbles comes out of it (just to ensure that there are no air pockets left inside the cooling system).   As for you not using any coolent, it has nothing to do with your overheating experience.  Coolents (or anti-freeze) are actually meant to prevent the water in the cooling system from freezing during sub-zero weather conditions and is not meant to reduce of dissipate heat.  However, coolent are still used in this part of the world because these coolents tend to have some additives that can lubricate and prevent corrosion in the internal parts of the cooling systems, thus people uses coolent here. Becareful to use only good and reputable brands of coolent as the "al-cheepo" ones will cause more harm than good.  So, it is entirely OK for not using coolent but it is advisable to use distilled or RO water because these water have very low mineral contents, unlike the water that flows straight from the tap.</blockquote>

Verification