The temperature of the Volkswagen Polo heater in 2002 is not high. When you step on the accelerator, the temperature will be mild. If you don't step on the accelerator, there will be no temperature. I flushed the water tank today and it still doesn't work. What can I do?

Is the air shot ready? Is the coolant insufficient? The air in the coolant pipe will form air resistance. After adding antifreeze, you need to drain the air. To turn on the heater, you can touch the temperature of the two pipes outside the heater water tank with your hands. The biggest difference in temperature is the heater water tank. blocked. Bleed out the air first and make sure there is no shortage of coolant. The water inlet pipe is very hot. If the temperature of the drain pipe is very different, it means that the heater water tank is blocked. When driving the car, remove the heater water inlet pipe to see if the water is circulating well. It is circulating. The good thing is that the problem is with the water tank. Let's check whether the cycle of the heater water tank is controlled by the thermostat. It usually runs a small cycle, so check it out.