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?

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.

There is a strange noise when I turn on the air conditioning, and adding refrigerant didn't help. The temperature is still okay, but I'm not sure what the issue is.

When driving, if the electronic fan does not start at high speed after turning on the air conditioning and the water temperature is high, how can this be resolved?

Why didn't the fuel consumption decrease when driving a Touran 1.4T manual on a long downhill in neutral?

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

Does anyone else experience this issue with the Hongqi H7 1.8T? In the summer, when stuck in traffic, turning on the air conditioning for a few minutes causes the engine to show high temperature.

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

The new Suzuki Alto stalls when the air conditioning is turned on while idling in the summer.

Is the lack of power when going uphill and the rise in RPM without an increase in speed in your fuel-powered Song Plus due to a spark plug issue? It's only driven 19,000 kilometers.