I got a new Rover rad during the build and has never got too warm, even on hot days. Bit of an unusual size the rad. So make sure you get the right one. Fan kicks in and gives you a blast of hit air!!
Could get a manual boost valve to try.
Or check actuator rod is not too loose. Should be half a hole out from connecting pin. Then just need to pull it that half a hole to connect up.
Well done on build
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