My astra is with X16SZR engine with aircon. I had the coolant and the thermostat changed recently. I had the gurgling noise from the air vents since then, the mechanic explained that this is normal... I had the same noise before that, but only in the first minute or two after a coldstart. It was almost permanent when starting from still recently. Checked the coolant yesterday, too low, took more than 1.5 litres to fill to the KALT mark. I reckon that the guy who changed the coolant just didn't bother to bleed it to remove all the airlocks. After this topup, the noises are _almost_ completely gone. Bought new cap as well just to play safe - costs only 4 quid. Still, when idle and I press the middle radiator hose, I can see a small burst in the expansion tank, and it just goes on forever. Does that mean that there is still some air locked in the coolant ? If yes, how can I get rid of it? I am going to check the coolant level tomorrow again. I never tried to press the middle hose with the cap off, just noticed an hour ago when the car was already parked and I was just looking at the engine. I thought that it would be a vary bad idea to just open the cap slowly to let the air out since the engine is hot - a sudden burst of a hot liquid burning my hands is not what you want...
According to my gauge, the temp goes up to 100 degrees before the fan kicks in. Is that normal? I thought that the normal operating temperature of the car is about 92-95 degrees. It is still quite warm here - 26 deg. celsius during the day.
How accurate is it to try to measure the temperature of the external surface of the radiator with a probe (some digital multimeters have this function)? I am suspecting the temp.sensor that sends the data to the gauge is not that correct.
Thank you very much in advance