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307 HDI 1.4 51 plate

Recently changed my coolant (due to having taken the head off) and since this time I have noticed that it seems to be trapping a lot of air in the expansion bottle after a journey. The return pipe to the expansion bottle is full of air bubbles. Is this normal or has something gone wrong or is it a case of air trapped in the system when re-filling (couldn't find the bleed screws) which should correct itself after a while.

I don’t seem to be losing any coolant and there is no ‘emulsion’ on the filler cap. But after a journey the level in the expansion bottle seems very low, until I take the top off. Then it goes back to the normal level after a load of air & pressure is released.
 
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