UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Block tester turned yellow is Co2 so you have a bad head gasket or a crack in the head .
But what is typical with this engine is many have this problem and when you get to a certain temp and put it under load it will start to burn coolant and push out a heavy white cloud of smoke .
I will get back to you with the other question tomorrow when i get back into work .
But as said very typical issue you have ,and believe in what you feel , as you said you are aware that this could be a headgasket .
and you will find it is , or you have a cracked head ??
Robert will get back to you in 12 hrs as its late at night here ..my time 19:16
Okay with this type of problem you need to do the test when the engine starts to smoke .
See if you can get to smell the exhaust smoke when turns white should be sweet if you have coolant in the system and not just water .