The bus has been sucking air into the coolant now for some time and i have got the bleeding of said coolant system down to a fine art. BUT it seems to be getting worse. i have changed the res cap, water pump and various hoses (not all yet) and have just done a sniffer test on the coolant tank that came back ok i have just put a pressure test on the engine all come out ok lowest was 114 highest was 130.
Unfortunatly whilst bleeding the bus this time the radiator split where the bleeding nut is located dont know if this is down to how many times i have undone and tightened this nut or possibly thats where there was a hairline crack????.
So in a nutshell......Im sucking in air not losing coolant dont think its the heads .....Next step im going to put a brand new rad on, hoses and going to change every hose in the engine bay.
Heater matrix going to have a look at this maybe changed to eliminate
Can you guys think of anything else that may need doing, this time whilst all my coolant is now running down the drive im going to spend about 300 quid and do as much replacing with new stuff as i can
God dam rust bucket dont you just love em

Also where can i get the thin metal pipe that runs at the back of the engine bay just under the engine bay lid