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@@cheekeong9349 vcds.

Hi @mannyxz , if your water pump, radiator, thermostat is new & you have confirmed that there are no blockages in these components, you need to do a combustion leak test. If a headgasket is leaking, high temperatures in coolant and oil will be seen. Is there any white smoke coming out of the exhaust when the car is at idle or revving? This could be an indication of a headgasket leak but sometimes, white smoke can't be seen though, best to perform a 'combustion leak test' with the right tools. Check the oil too. Any kind of oil + coolant mixing will turn the liquid milky. If it is, don't start the engine. If all these has passed the tests, there could be blockages in the coolant passages inside the engine block / head itself. Best option here is to open it up for a rebuild but you can always try radiator flush to see if there's any improvement.

@@hams_718 I have checked the oil it looks good. In fact, I changed it when I replaced the radiator on 27th June to Liquimoly. I don't see any white smoke coming out of the exhaust either. Will try doing the combustion leak test. Also, I have heard a hissing sound from the engine but not always. Could it be a vacuum leak? When I was accelerating with the windows down, I smelled something but it is definitely not the coolant. There are no fluid leaking on the ground too.

@@Mannyxz Mine hisses from the engine bay too with an odd smell coming from the engine bay when the hood is open. Looked everywhere, sprayed some soapy water on all hoses to see if there are any bubbles forming but nope, nothing at all. Even brought it to VW service center to get it checked by a professional, apparently the hissing is normal but I doubt it since I never heard the same sound before. Will do further inspection and reply here if i manage to figure out what it is..