My coolant temp looks like this:
It fluctuates, but never really goes much higher than the first bar. It's not really been a big issue for me, better cold than hot, however the cabin heater has gradually been getting colder and colder as well and now that it's almost winter I'd like to get this sorted.
I'd like to possibly diagnose this myself.
There are no errors on the dash, or warning lights.
Coolant reservoir is full, no fluctuation in coolant level.
The radiator fan isn't on, nor have I heard it come on.
The radiator was replaced last year with new coolant and the system bled. It was fine until about 2 months ago when the water temperature started to slowly drop.
The car is an r52, 2005, Mini Cooper Convertible. 110,000 miles.
No other running issues or faults.. just cold engine, and cold cabin heater.
So yeh, what would be the best course for diagnosis? Is there a hidden dashboard menu with any diagnosis stuff like coolant temps? Could I buy one of those cheap code reader things off ebay and plug it in? Can I remove anything like thermostat or radiator temp sensor to check?