Why is the car air conditioning slow to start?
3 Answers
It may be due to a damaged blower, a dirty or clogged air filter, or a faulty air door motor or stuck flap. Introduction to air conditioning is as follows: Introduction: Car air conditioning refers to the air conditioning device installed in a car, which can cool, heat, ventilate, and purify the air inside the compartment, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety. Structure: It generally includes refrigeration devices, heating devices, and ventilation devices. This combined device makes full use of the limited space inside the car, has a simple structure, and is easy to operate, making it a popular modern car air conditioning system internationally. Layout: Different types of air conditioning systems have different layout methods. Currently, integrated heating and cooling air conditioning systems are widely used in cars. The layout involves assembling the evaporator, heater radiator, centrifugal blower, control mechanism, etc., together, known as the air conditioning unit assembly.
As an experienced driver, I've encountered slow AC startup several times. It's most noticeable in summer traffic jams, where it takes two to three minutes after pressing the AC button before cold air comes out. The main issue lies in the cooling system: the radiator and condenser fins get clogged with willow catkins, reducing heat dissipation efficiency. Another time, it was due to aging of the compressor's electromagnetic clutch, causing slower engagement after power-on. Also, slight refrigerant leakage in older cars leads to insufficient pressure, triggering the compressor's protection mechanism and causing delayed response. My suggestion is to first clean the dirt from the radiator gaps and regularly check refrigerant pressure. If the problem persists after cleaning, have a mechanic test the entire AC pipeline system with a pressure gauge.
As an air conditioning repair and modification technician, I've handled many such cases. Startup delays are most commonly caused by insufficient refrigerant or air mixed in, requiring the compressor to spend extra time building sufficient line pressure. It's like needing more pumps on a leaking bicycle pump before air comes out. Another frequent issue is clogged expansion valve filter screens, which impede refrigerant flow and slow down cooling. Electrical problems like oxidized relay contacts causing signal transmission delays are also hidden culprits. Additionally, belt slippage can lead to insufficient compressor speed, reducing cooling efficiency. I recommend testing high and low pressure line values - if below 200kPa, add refrigerant while simultaneously checking belt tension and electrical contacts.
