Thanks anyway for the info and your help. The reason i ask is that my astra is a life model and has no temperature gauge and the temperature cannot displayed on the vehicle display. i have therefore been modifying it by adding a kitchen meat probe digital thermometer with a remote probe ( don't all laugh it works very well!) . this is clamped along the stub leading to the thermostat housing and is insulated. Having spent a lot of time experimenting with it's positioning it now works very well. Normal driving engine temperature is around 95c and the fan cuts in at its 1st speed at 108c. Knowing the design temperature the fan should cut in would have given me a good idea how accurate my " home made" temperature gauge is. PS if anyone wants details of this mod which cost me a whole £12 just let me know!
is u hold settings buttons on strero until beeps and press the right button where click is displayed and go to were it’s shows 0 v:t
And that’s the temp gage next to the t