coolant

Dear Sifus, Just want to ask, the other day while engine not totally cold, i opened the expansion bottle cap. There are some pressure released and the coolant level went up. So do I need to bleed the coolant? Would there be air trapped if like that? Also, do we have to bleed every time...

Recently I have been monitoring closely the coolant temperature of my M54B25. IIRC, it used to range from about 87 to 97C. To my surprise, the low point now sometimes go as low as 78C in highway cruising at 120km/h and 80C in heavy traffic. When I compare the coolant temp (A) at the engine...

Dear sifus, In my previous topic, i mentioned that coolant signal comes on and I did a pressure test where only the nut was found to be the leakage. It was replaced. Now: 1) signal comes up from time to time; 2) Temperature shoots up fast when car is stopped at traffic light [Note: It goes...