Had simlar sort of issues to yours on my ASZ 130, would drive all day in traffic and if kept below a certain RPM. As soon as I started to work the engine, accelerating hard or going up a hill, the temp started to rise up. Easing off and the temp dropped down again. Was advised to check if...
Connect the vac line from the vacuum pump onto the line going to the turbo actuator, that will give you full boost with no control from the N75. Just do this bypass to confirm that it is now making boost, and dont be tempted to drive it like that as it will harm the turbo.
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