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Why does the air conditioner suddenly stop blowing hot air?

2 Answers

LeMia

07/28/25 10:56pm

If the air conditioner suddenly stops blowing hot air, it may be caused by the outdoor unit shutting down completely. The main reasons are as follows: 1. The indoor unit control board stops working after a few minutes, which is caused by the outdoor unit's power supply. This may be due to the outdoor unit's operating current being too high, causing the indoor unit board relay to be unable to handle the maximum current value. 2. The outdoor unit compressor overheats and triggers protection. Poor heat dissipation of the outdoor unit or excessive aging of the compressor can cause the compressor temperature protection switch to shut down. The most common solution to this problem is to clean the outdoor unit condenser or check the outdoor fan speed. 3. The four-way valve coil loses power. If the air conditioner still heats, it indicates that the four-way valve is damaged.

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LaJoy

08/12/25 3:22am

I recently encountered the issue of the AC not blowing hot air, mainly due to low coolant levels or a leakage problem, since the car heater relies on engine heat transfer. Another possible cause is a faulty thermostat that can't activate the heating mode, or a stuck blend door that won't open. If this happens while driving in winter, the car interior can feel extremely cold, affecting comfort, and may also cause window fogging, impairing visibility. So, I recommend promptly checking the coolant reservoir under the hood for any discoloration or reduction. It's best not to tamper with the electrical circuits yourself to avoid damaging more components—just take it to a professional shop for inspection and timely resolution to prevent driving hazards.

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What Causes Water Leakage Under the Front of a Car?

The reason for water leakage under the front of the car is the condensation water produced by the air conditioning system during operation. Here are the relevant explanations: 1. Condensation water dripping from the air conditioning system: This is a normal phenomenon. When the air conditioning is working, moisture in the cabin condenses on the evaporator, forming water droplets. These droplets are then discharged outside the vehicle through the drain pan and drainage pipe. 2. Additional information: The location where the car's air conditioning system drains water is slightly to the right of the center of the front of the car. If you turn off the engine after driving for a while in summer and wait briefly, you will often notice water dripping from the chassis slightly to the right of the center. Within a short time, a puddle of clean, transparent water can be seen on the ground under the car. This is not a sign of any problem with the vehicle but rather the water discharged by the car's air conditioning system.

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