In order to properly flush the engine, the coolant system must be filled with water and cleaner, purged of all air, then run for about 20 minutes. Section 2 - Flushing the Coolant System As mentioned at the beginning of this article, the coolant system should be flushed with distilled water and a high-quality agent like Liqui Moly Radiator Cleaner. The coolant system is now completely drained and can be flushed.Allow the thermostat and the hose to drain for about 5 minutes and then replace the hose. If the fitting is stubborn and won't pull free from the thermostat, use a large flat blade screwdriver to gently pry it off. It is can be easily released with a straight metal pick like the one shown below.just reach over the top of the fitting and lift it up. Many mechanics struggle with this locking clip because it is located on the top of the hose. To remove the large thermostat return hose, you must release its locking clip first.There is no need to remove any of the other thermostat hoses.the large return hose will thoroughly drain the engine. In order to thoroughly drain the engine block, the large thermostat return hose on the front must be removed. Locate the thermostat on the front right side of the engine.Retract the locking clip and firmly push the lower radiator hose back onto its fitting until you hear it click into place.Let the radiator and the hose thoroughly drain for a few minutes. Grasp the lower radiator hose and pull it loose.Have a drain pan or bucket ready.a lot of coolant will be discharged when you pull the hose loose. Use a metal pick or flat blade screwdriver to release the locking clip on the lower radiator hose fitting.Locate the lower radiator hose at the bottom right hand side of the radiator. It is held in place with phillips head screws. Remove the belly pan from underneath the engine.This will allow the system to drain thorougly. For more information on jacking and supporting your BMW, please see our article BMW Jacking and Supporting for Repairs and Maintenance. Jack and support your vehicle at all four wheels so it is level.Make sure to have plenty of drain pans and cleaning rags ready. This requires draining the radiator and the engine block (via the thermostat). So yeah, I guess my popsicles are safe!ĭidn't have time to remove the bumper, will do it these days and will report.Section 1 - Performing a BMW E60 Coolant Flush In order to properly flush out the coolant system in your 5 series' N52 6 cylinder engine, you must remove as much of the existing coolant as possible. It stays on the tray and its water and odorant evaporate so what actually drips is concentrated washing product (more greasy) without odorant. My explanation: there's a slow leak of wiper fluid from the headlamp washer. The wiper fluid, however, has some odorant in it which I can't detect in the dripping fluid. My suspicion now is that it's actually not coolant but wiper fluid - it's also blue and slightly greasy to the touch (not as much as the liquid that's dripping though). The traces of liquid that I mentioned in the OP are not on the shield but on a tray under the duct. I could also not detect any loss of coolant. There is simply no way whatsoever for coolant leaking from anywhere (engine block/head/gasket, water pump, coolant pipe, hoses, thermostat, connections, expansion tank, etc.) to get to the point where it's dripping from without leaving traces on the shield or splashes somewhere at the engine bay. No trace of a leak on the lower protection shield. Checked all hoses and connection points - completely dry. Had a bit more time after work and had a look. Below I take a really close look to it these days (removal of the shield under the engine) I would like to ask you:Ģ) Does anyone know of any usual suspects (so far my attention is drawn mainly towards the radiator drain plug) No significant loss of coolant detected, drove the car for an hour - no sign of overheating, everything runs fine. There was a bit (maybe an ounce or two) of the same liquid on the left side of the protection shield under the engine bay. No coolant leak/splashes visible from any system under the bonnet. Bluish, clear, greasy (not as much as oil, of course) and sweet (tasted it carefully). Took a drop that was hanging at the lower part of the bumper and examined it. Two weeks ago I noticed a wet spot on the ground under the extreme left (driver's) side of the front bumper, just below the left air-duct. To keep the long story short, got divorced, moved to a new place so my roadster spends lots of time under a car-cover now.
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