Thermostat replacement

[Mberry]

I’ve been looking high and low, the actual task of replacing the thermostat looks pretty easy however I cannot find the size of torx bit head on the mounting boots nor the recommended torque specs. Any help is greatly appreciated

[EAD15]

Service manual says 5.9 lb-ft for the thermostat housing retaining bolts. Doesn't specify the bolt size unfortunately.

[slayerized6]

I remember it being an 8 or 10mm hex head, not a torx head. what year is your Aveo?