Yep, sounds like a head gasket. I’ve had it before in a couple of cars, and lack of heating is one of the first symptoms of a real bad time - the cabin heater works off hot coolant coming out of the engine. So when hot coolant decides to hang around inside your block and make friends with your oil instead, it won’t warm the cabin.

Replacing a head gasket isn’t the worst job in the world - but driving while overheating can do things like warp the head, which isn’t fun to fix.

The one on the left refers to the driver, the one on the right refers to the car. It’s dumb. But it means your car is set to eco mode - which limits throttle response and things like AC - and you are also currently driving in an economical way.

You do have to look into this to work out what counts as a “problem”. “My phone keeps losing bluetooth connection” is as serious as “my differential exploded”.

Infotainment “problems” were twice as numerous as any other category in this survey. It seems unfair to write off the whole car because of that, but it’s what bothers people nowadays as much as mechanical reliability.

Just use the negative battery terminal, but don’t tell anyone…

Sudden cold weather can contract the air in the tire. This lowers the pressure and can sometimes make TPMS think there is a slow leak. Hopefully, it should go away if you drive normally and the tire warms up.