Why Does the Temperature Rise When the Air Conditioner is On?
3 Answers
The reasons for high temperature when the air conditioner is turned on are as follows: 1. Check whether the electric fan is working properly: Normally, the electric fan has two gears, one is the low-speed gear, and the other is the high-speed gear. The high-speed gear usually works when the air conditioning pressure is too high or when the engine water temperature reaches 103 degrees Celsius. If the electric fan does not have high speed or the high-speed rotation is insufficient, the above phenomenon will definitely occur. It should be noted that if the electric fan does not have high speed, it may not necessarily be a problem with the electric fan itself. The high-speed fuse of the electric fan is located in the fuse box above the battery. If the fuse is blown, the fuse circuit is not in good contact, the air conditioning high and low pressure switch is damaged, or the fan high-speed relay is damaged, it will cause the electric fan to have no high speed. 2. Check whether the thermostat opening is insufficient: If the thermostat opening is too small at normal temperature, it will cause the engine cooling water circulation speed to slow down, resulting in high water temperature at low speed. 3. Check whether the water pump has an idling phenomenon: The water pump impeller of the Jetta is made of plastic. If the shaft part is cracked, it will cause an idling phenomenon when the water temperature is high, leading to high water temperature.
I used to turn on the air conditioner to blow hot air, and it was really uncomfortable. It turned out that the refrigerant was insufficient, and frequent long-distance driving made it easy to leak Freon. Once replenished, it was fine. If the compressor is buzzing but there's no cold air, it might be a broken fan. If the fan doesn't spin, the heat dissipation won't work. A malfunctioning thermostat can also lead to misjudging the temperature. Additionally, if the condenser is too dirty and clogged, poor heat dissipation will cause the air to become hot. This is especially dangerous in hot weather, as it can easily lead to driver fatigue. I recommend going directly to a professional shop for a comprehensive check-up. Don't save money and ignore it—fixing it early can avoid big troubles. Before driving in summer, make sure the air conditioner is set correctly and not in reverse mode.
Last time my car's AC was blowing hot air, and I was in a panic. I tried turning down the temperature knob, but it still didn't blow cold air. Experience told me it might be a system leak or a seized compressor. Older cars are more prone to this, and a slow-running fan can also affect it. If you park under trees a lot, leaves can clog the condenser, causing hot air to blow out. When I went for a car wash, I had it cleaned, and the air turned cold again. During daily driving, make sure to check if the AC filter is dirty—it can save a lot of trouble, and replacing one only costs about ten bucks. In hot weather, identify and fix issues early, otherwise, the car interior can become as stuffy as an oven, which is dangerous as it distracts you while driving.
