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Pull the hoses off the injectors,and run until dry,keep putting fresh water through it and repeat.Blow out injectors and re connect.
When you just keep topping up the system,you will gradually get a build up of crap in the bottom of the bottle.
Stick a hosepipe in it and blast it out as well,I...
We had a couple of those and go tight then suddenly slip.There is a bleed screw on the t'stat housing(10or8mm bolt),you can see it just below the temp sensor switch in the picture,below coil pack.