Hi
I had overheating problems when my thermostat housing was broken. Ball was missing.
Symptoms was like this:
Car took time to warm up when was bit cold day. And if was hot day temp needle went nearly in red when idling in traffic. Now i have replaced that thermostat housing and car warmup faster and needle dont go over ½ of meter. I have airtec large intercooler and airtec alloy radiator with 2 slim fans.
And one extra thing, that fan switch. I had brown sensor originally but now i have green, fans do start in lover temp.