Hi guys, sorry for the delayed reply. Been in hospital.
My new tank still hasn't arrived so had to cancel and re-order the thing!
Should be here by the weekend they say...
Anyway, my mate did another combustion check and the top chamber turned a slight green but the bottom stayed blue. However, with a few squeezes, the liquid in the top chamber turned back to blue???
We thought his liquid may have expired or something so he said he'll come back again once he bought some fresh stuff and re-tested it on Monday.
On Monday, i took the car to 1320 and they did an engine healthcheck (without dyno) and the leak down test was fine.
He reckons it might have been an air lock so he bled the system at the same time. They reckoned that its sound and to run it for a few days more... He tried to do a coolant pressure test but the pressure wouldn't hold at all yet no leaks showed up so he reckons the seal on his tester was knackered because if it lost pressure at that rate then a leak would be very obvious.
That night, my mate came back to re-test with new liquid.
It stayed blue in both chambers and he thinks its fine, too!
However, I've done what some of you said about taking the cap off and running it up to temp but by car doesn't create a swirl OR bubbles so what does that mean?
The hoses are all warm but they're soft. The hose at the top of the expansion tank wasn't as hot as the others if that helps?
Also, the coolant smells of ammonia - really badly?!?!?!
Apologies for going on but had a lot to explain...