Pattern 11, 12 or 13
Hi Ken
Which Pattern 12 it comes off the filler neck, 13 off the top tank, but don't forget get the steam relief line coming off the back of the block which connects to the top tank as well.
Both the recovery tank and the steam relief are very important to making cooling system work correctly. I run all three of my CMPs with the steam relief open just a little bit which first vents any steam or air out of the back of the block, it also allows coolant to start circulating when the thermostat is closed fully when starting, helping to stop hot spots in the block.
When the coolant recovery system is working as designed it really keeps the radiator full at all times. You may have seen the photo of my Pat 12 running with an clear bottle attached to the vent on the standard coolant recovery tank. This is how I charge the recovery tank with coolant so that it always as some coolant whether engine is cold or full hot.
Cheers Phil
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