Cold air water pump

What do you want to ask is what caused Volkswagen Touran to change the water pump, turn the fan into cold air and make the sewer pipe cold when the temperature rose? Normal phenomenon. According to the inquiry of official website, car home, Pacific Ocean, after replacing the water pump, the water must be discharged, so the cooling liquid in the system will be affected during this process. If most of the cooling liquid is drained at one time, and new cooling liquid is added, bubbles will appear in the cooling system, resulting in less cooling liquid in the sewer pipe, which makes the sewer pipe feel cold.