Why is the air conditioning in a Toyota car not cooling?

[DelElias]

Toyota car air conditioning not cooling reasons are as follows: 1. Clogged air filter: This is the most common reason, a clogged filter will obstruct the air flow, causing the air conditioning not to cool. 2. Blower damage: The blower is an important part of the air conditioning system, if damaged, it cannot blow air. 3. Faults in the air door, computer or switch. Information about car air conditioning is as follows: 1. Car air conditioning: Refers to the air conditioning device installed in the car, which can cool, heat, ventilate and purify the air inside the compartment. 2. Function: To provide a comfortable riding environment for passengers, reduce driver fatigue, and improve driving safety. The air conditioning device has become one of the indicators to measure whether a car is fully functional. 3. Structure: Generally includes refrigeration devices, heating devices and ventilation devices. This combined device makes full use of the limited space inside the car, with a simple structure and easy operation.

[StBrynlee]

I've also encountered the issue of air conditioning not cooling before. I remember that time driving in summer felt like being in a sauna. Later at the repair shop, I found out that Toyota air conditioning systems commonly have several problems: refrigerant leaks are the most frequent, especially in older cars where the pipe seals have aged; the air conditioning compressor belt can become loose and slip, so even if you don't hear any strange noises, it's worth checking; also, if the evaporator filter is too dirty and blocks airflow, the cooling effect is directly reduced; more troublesome are electrical issues, where if the temperature sensor or control panel is broken, the system can malfunction. My habit is to first open the windows for ventilation and then try the AUTO mode, setting the temperature to the lowest—if there's no cool air, it's basically a fault. Now, I always remind my friends to regularly clean the air conditioning system, after all, replacing a compressor costs several thousand.

[ElizaMarie]

Having repaired numerous Toyota AC issues, I've noticed most owners overlook basic checks. The first step should always be checking AC pressure - if gauge readings from high/low pressure lines are out of spec, refrigerant needs replenishing. Then verify if the cooling fan operates normally; an overly dirty radiator can trigger overheating protection. That 10A AC fuse in the fuse box burns out easily - replacements cost just a few dollars. If airflow weakens significantly, it's usually a clogged cabin filter or failing blower motor. Any metallic grinding noise from the compressor demands immediate shutdown - prolonged bearing seizure can destroy the entire system. I recommend refrigerant testing every 20,000km to prevent minor issues from escalating.

[CarlosLee]

Twenty years of driving experience summarized: Troubleshooting air conditioning cooling issues step by step. After pressing the AC button, listen for the compressor's click startup sound—no sound indicates an electrical circuit issue; if there's sound, feel the high-pressure pipe (should be hot) and low-pressure pipe (should be cold)—if not cold, it's likely low on Freon. Check the coolant reservoir level; a dirty condenser with poor heat dissipation can also reduce cooling efficiency. If the control knob lacks resistance when turned, it's probably a potentiometer issue. For electronic Toyota models, also check if the onboard computer reports any fault codes. Don’t turn off the AC at red lights—frequent starts and stops are most damaging to the compressor.