What is the reason for the low-pressure pipe being cold but the interior not cooling down?
2 Answers
If the low-pressure pipe is cold, it indicates that the refrigeration is functioning normally. Check if the evaporator filter inside the vehicle is clogged. If it is clogged, it will affect the heat exchange of the evaporator, preventing the heat inside the car from being carried outside by the evaporator. If it's clogged, the cooling capacity will be very low, resulting in the inability to lower the temperature inside the car. Also, check if the car's air recirculation is turned off. If it's turned on, it may also prevent the interior from cooling down. If these checks don't resolve the issue, take the car to a repair shop to check if the air conditioning system's operating pressure is normal. Below are routine checks for air conditioning not cooling: Refrigerant: Check if the system has refrigerant. If not, pressurize the system to check for leaks, then refill it. Compressor: If there is refrigerant, check if the compressor is working. If not, inspect the air conditioning pressure switch, temperature control switch, and their wiring for issues. Heat dissipation: Check the air conditioning's heat dissipation, see if the fan is working. Clean the condenser. Replace the air filter.
When I find the low-pressure pipe is very cold but the car isn't warm, it's usually because there's something wrong with the air conditioning system. If the refrigerant is insufficient, the low-pressure pipe will be icy, but the evaporator won't cool down properly. If the fan spins too slowly or the air filter is clogged, the heat won't dissipate, making the car feel hot. When I was repairing cars, I encountered this situation, which could also be caused by a stuck temperature valve or the air conditioning condenser not working properly. Don't overlook issues with the ventilation system, such as incorrect settings in recirculation mode, which can lead to poor airflow and lack of cooling. It's best to check the refrigerant pressure and ensure the fan is functioning properly before the peak of summer when driving becomes uncomfortable. Additionally, system icing is a common problem, especially when the air conditioner is turned on and off repeatedly. It's important to get it fixed at a professional shop early to avoid higher costs later.
