Why is the low-pressure pipe cold but the car interior not cooling?

[LiamAnn]

The cold low-pressure pipe indicates normal refrigeration. Check if the evaporator filter inside the car is clogged. If clogged, it will affect heat exchange at the car's evaporator, allowing hot air from the interior to escape outside. A blockage results in minimal cooling capacity, preventing the interior temperature from dropping. Also, verify if the car's air recirculation is turned off - having it on can prevent proper cooling. If these checks don't resolve the issue, inspect whether the air conditioning system's operating pressure is normal at a repair shop. Below are routine checks for non-cooling AC systems: Refrigerant check: Verify if the system has refrigerant. If not, pressurize to check for leaks before refilling. If refrigerant exists, check compressor operation. If inactive, inspect the AC pressure switch, temperature control switch, and related circuits. AC heat dissipation check: Examine the AC's heat dissipation and fan operation. Clean the condenser.