That looks better Neil.....
I then went onto a faster road and found that as the car was pulling up to 70 the temp started rising again up to about 112 and I eased off the throttle, the temp then very slowly started dropping back
Perhaps that’s the delay or lag mentioned in my last post. When the engines load increases the stat doesn’t respond quick enough. That’s why the early Duratec engines had stat heaters. The ECU would see the engine load and switch the heater on to kick the stat into action.
I’m now wondering if I should decrease the size of the blanking plate to allow more air through at the higher speeds or increase it further.
Yes, you could try and decrease it but don’t forget this is counter intuitive. My money would be on increasing it a little bit at a time. Or maybe leaving the blocking like that and now consider combining it with a lower 82C opening stat?
NB - Just be aware to factor in the ambient air temp each time you test as that will affect the Delta T of the rad from one day to another. And don’t be surprised either if the car runs hotter in winter too.....
