Hello, with our V40 (petrol, 115 hp, year 98) the heating does not work really well. It comes maximum lukewarm air. The temperature indicator is slightly below the center. I have unfortunately only my 850 as a comparison. It heats very well and has the indicator (after the thermostat opened) exactly in the middle. Is it possible that the thermostat has broken open, or is there any other problems? The water pump was changed when the timing belt changed recently, But I don’t want to rule out anything. Would the thermostat be easy to replace? Which antifreeze is needed with the engine? Thank you very much.