When you turn on the heater and direct it towards your feet and face, it initially provides warm air, but gradually the air becomes cold. What could be causing this issue?

Why does the water temperature rise when going uphill and automatically decrease when going downhill, or when turning on the heater with the air conditioning?

The engine temperature is normal, but the air from the heater is not warm.

The engine speed of a 2016 Changhe Liana A6 becomes unstable after turning on the air conditioning.

When the air conditioning blows cold air for a while and then switches to hot air, and after being turned off for a bit, it works again before reverting to hot air, it's puzzling. Interestingly, this issue doesn't occur on rainy days or when the weather isn't too hot. What could be the cause of this situation?

Does anyone know how to adjust the Hongqi H7 when the front row has warm air and the back row has cold air?

I've got a 2014 Grand Cherokee, and lately when I turn on the heater, the driver's side vent blows cold air while the passenger side vent blows warm air. Does anyone know what might be causing this?

What could be causing the Luxgen M7 engine to make a knocking noise when cold, but not when warmed up?

What's going on when the heater in a Changan Yuexiang is blowing cold air?

Does your Santana's engine shake when you turn on the air conditioning for cold air?

After a highway trip, there's this strange noise whenever I turn on the air conditioning. Does anyone know what might be causing it?