I find my temperature gauge hardly gets above the 80 mark on the dial and the car is certainly not as warm as my cavalier.
I have a 53plate 1.6 8v on 58000 miles. The head was skimmed and the timing belt replaced at the time. The coolant and lubrication systems were also flushed. I am not sure if the thermostat was replaced at the time. There was the usual froth on the dipstick at the time. The garage which did the repairs are the usual repairers,with a good reputation, for the valeting co. I bought it from . The car is in very good condition and pulls very well. There is no loss of coolant etc.
Compared to my cavalier temp. gauge which usually sits just below mid scale on the dial. Would it seem to be a susupect stat in my Astra?
I would check the Astra thermostat but from the discussions here it appears to be more complicated. ie requiring removal of timimg belt, somethiong I would not attempt myself. I would appreciate any comments or advice.