I know changing the heater matrix o rings has been discussed
And a lot of people have done it
Can it be done without draining the coolant ?
I'm thinking that with the engine not running the pump will stop all th coolant draining any idears / experience ?
Did my valve block last year and had similar symptoms to yours anyway like you checked everything ten times and couldn't find the cause in the end gave up and striped the valve
Block again and found I'd put one of the needle valves in back to front it had snapped and half sealed the hole making...
Sorry got the software and leads already with USB convertor already just thought cause iPhone has USB for charging and syncing can I upload software to it and use my leads
its only just started to happen in the last couple of days but at constant throttle position at 40mph my engine seems to judder / miss a beat no rev drop or fluctuation can anyone shed any light ?
any ideas or suggestions gratefully received