I Have a query about my astra 1.4 16v mk4
My car temp gauge takes for ever to go up, around about 20 minutes to start going up, and once it reaches 90ish degrees when doing slow speeds like 20-30mph, If I do anything more than 50 mph or dual carriageway speeds, the temp drops right off the scale again, as though its just started like
And then when I start doing slow speeds it goes right back up to 90 degrees within about 30-40 seconds
Does this sound like a knackered thermostat?
Any help would be Greatly appreciated