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In Reply to: Prestone Flush'n Fill Kit how to flush engine posted by Patrick C 88 750iL on January 13, 2002 at 01:01:13:
1. Remove the cover pan under the radiator.
2. Place a large pan under radiator drain and remove plug. (I used a great big pan I got at Ace Hardware, about 18"x24"x6")
3. Let coolant drain for a few minutes. It should slow to just a drip.
4. Remove coolant overflow tank cap.
5. Put a garden hose into coolant overflow, turn it on enough so it just fills the tank, without overflowing.
6. Drip from radiator drain should start to flow again.
7. Once radiator is draining well, start engine.
8. *** Watch temp gauge closely *** It should stay on the cold side.
9. Keep flushing until water runs clean. You may have to empty the pan. I was able to pull mine out far enough to scoop coolant out of it into a bucket, then empty bucket into toilet.
10. Once water is clean, shut off engine and shut off water.
11. Let water drain from radiator until it's back to just a drip.
12. Re-install radiator plug.
13. Add BMW coolant to overflow tank. Note - it's best to dilute the coolant some before putting it it. It's very thick cold and may not want to flow well. I diluted it 50/50.
14. Start engine and add coolant until full.
I bought a pack of Prestone Flush'N Fill Kit which is suppose to allow me to feed water from a garden hose into the engine and have water travel through the radiator and out (thru the disconnected upper radiator hose). The kit includes a few Tee connectors of different sizes, hose clamps, back-flow preventer coupler, and a splash deflector tube. The advantage is to flush the engine coolant without removing the engine drain plugs.
The tee connector should be connected between the engine and heater. I look into the several coolant hoses between the engine and auxillary pump, and have no idea where to put the tee. Furthermore, space is cramped there.
Has anyone tried flushing the engine using a kit like this? Or is there a better way to flush the engine short of unscrewing engine drain plugs? The plug on my left engine block has been difficult to unscrew, particularly the exhaust manifold blocks the bolt partially. Thus the socket doesn't sit square on the bolt and I couldn't apply much torque before the socket slipped out. 13mm swivel socket didn't help either.
Patrick C 88/750iL/100K/US
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