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Hello my name is ***** ***** am I speaking with.
How old is the actual impeller, and when was the last time it was changed?
Have you changed the thermostat yet?
Hi Jason, I'm Simon. The impeller was about 1 year old, had no damage, but has been changed for new anyway. Have not changed thermostat - more concerned about combustion gases in cooling system. Somehow the system has picked up my wife's email address, so she has just received your query. I did type my email address, which is the same as hers, except sim at the front instead of ang. Thanks.
Yes, that's correct. Glass tube, blue fluid, turns yellow.
Correct. Tester applied to expansion tank and air drawn from there; but interesting that antifreeze can change the fluid colour. However, bubbles appeared in the tester, the fluid level did not increase. I might have to leave PC in a moment, so next response might be tomorrow.
Hi, I have checked the tester, and it is fine on good engines, and changed colour on one that had a known head gasket problem. I would have expected any leak with a diesel to produce much more pressure in the system, so wondered if there was anywhere else that could leak, or any common issues with this model of engine?