I have created this PDF which illustrates a stress free method of refilling the coolant on a P38. I have attached this PDF.
I have used this method three times now after various engine maintenance jobs including removing the engine for overhaul. With this method the engine comes up to temperature and stabilises immediatley -without any airlocks.
Previously I had tried putting the car on a slight uphill slope, but that created an airlock. You might see why by looking at the pictures.
In my previous P38 the dealer left the lid off the overflow bottle during warmup and coolant went all through the fusebox - I don't let them near it anymore.
Hope this helps. - and don't skimp on the 50-50 ratio.
I don't about you guys/gals, but I've never had issues with water overflowing. I generally only fill the reservoir about half way to allow for the air to bubble out and wait a while then standing ready with a jug of 50/50 and gradually top it up as the air escapes and presto!!!!...
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