BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > AC not blowing cold air, even with full refrigerant? Thread Tools: Search this Thread 04-30-2017, 12:13 PM.. Note: Dirty cabin air filter mostly only leads to reduced cooling. If only hot air comes out of the air vents in your 530i, then the problem probably lies somewhere else. 2. Dirty or clogged condenser. Like the radiator, the air conditioning condenser on BMW 530i sits at the front of the vehicle and is responsible for releasing the heat from the refrigerant into the ambient air.

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The most common causes for AC not cooling properly in BMW X3 are low or overcharged refrigerant, compressor malfunction, clogged cabin air filter, dirty condenser or evaporator coils, dirty or sluggish blower motor, and bad fuse or relay. Less common causes are clogged expansion valve or orifice tube, overcharged oil, faulty blend door actuator.. The blower motor resistor is one of the most common parts to fail in the A/C system. One of the common symptom of a failing final stage unit is the blower motor not operating in accordance to how the controls are set, almost like it has a mind of its own. If you are still in need of the blower motor resistor/regulator, we have the OEM Behr for.