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T-Cut · 28th May 2020, 16:13

As said, there's nothing unusual in your findings. Radiator/fan cooling isn't an instantaneous process, the pump must ciculate hot coolant from the heads to the radiator top and downwards. It takes energy and revving the engine will simply speed that up a bit. There's also a high ambient temperature at present so the cooling efficiency will be lower than in cooler weather. Re-flushing the system will be a waste of time and money in my humble opinion.
Just to be clear, coolant temperatures of 100- 105C isn't overheating. It needs to approach 115C before you're getting into that situation. So while 100-105C seems pretty hot it's well within the normal operating band.

TC

28th May 2020, 16:13	#6
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	As said, there's nothing unusual in your findings. Radiator/fan cooling isn't an instantaneous process, the pump must ciculate hot coolant from the heads to the radiator top and downwards. It takes energy and revving the engine will simply speed that up a bit. There's also a high ambient temperature at present so the cooling efficiency will be lower than in cooler weather. Re-flushing the system will be a waste of time and money in my humble opinion. Just to be clear, coolant temperatures of 100- 105C isn't overheating. It needs to approach 115C before you're getting into that situation. So while 100-105C seems pretty hot it's well within the normal operating band. TC Last edited by T-Cut; 28th May 2020 at 16:19..