The reasons why the Emgrand 715's cooling and heating rotation cannot rotate are as follows:
1. The thermostat is always open or opened too early, and the car's water temperature participates in the general cooling cycle before it rises.
2. The electronic cooling fan always rotates.
3. The heater water tank or water channel is blocked, and the antifreeze containing heat cannot enter the heater water tank for circulation.
4. The heater valve cannot be opened normally.