[P38] Exhaust gases in coolant

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Before filling the system, I stuck a hose in the top of the radiator and removed the drain plug to try and flush as much crud out as I could

What colour was the flow ?


I broke my bucket :(

This is the flow out of the drain plug with the hose in the top pipe - I couldn't turn the pressure up very high because it would just blow back out the top.



I gave the bleed pipe a good blow from the rad side, and I could hear the bubbles in the expansion tank


That look like a restricted flow ...

Take the rad off and lay it flat on the floor and do the same flush ...
 
Did you remove & test the thermostat at any point ? Also it's possible to get the two smaller pipes on the wrong ports, which does affect the coolant flow.

Cooling System Flow P38 THOR.jpg
 
I'm sure the pipe from the radiator to the expansion is correct because I can blow through it and hear bubbles, hopefully that means the other pipe is in the right place too
You disconnect from the radiator and the other end goes to the expansion filler neck. You shouldn't be blowing bubbles, it should be clear
 
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