What are the reasons for the burnout of the automotive air conditioning compressor coil?
3 Answers
The reasons for the burnout of the automotive air conditioning compressor coil are as follows: 1. Abnormal load and locked rotor; 2. Winding short circuit caused by metal shavings; 3. Contactor issues; 4. Power phase loss and voltage abnormalities; 5. Insufficient cooling; 6. Using the compressor for vacuuming. The functions of automotive air conditioning are as follows: 1. Adjusting the interior temperature: The air conditioner can control the temperature inside the vehicle cabin, heating or cooling the air to maintain a comfortable level. 2. Removing moisture from the air: The air conditioner can dehumidify the air, with dry air absorbing human sweat to create a more comfortable environment. 3. Ventilation and air filtration: The air conditioner can intake fresh air, providing ventilation; it can also filter the air, removing dust and pollen.
I've suffered from the issue of burned-out car air conditioning compressor coils! The most common culprit is voltage problems, such as unstable charging from the alternator or aging batteries causing voltage fluctuations—coils can't handle this rollercoaster ride. Another cause is poor heat dissipation, like when the condenser is clogged with willow catkins or the cooling fins are deformed, leading to a spike in system pressure without adequate cooling, causing the coils to fail under high temperatures. Then there are human errors, like opting for cheap aftermarket coils that smoke after just a few uses, or improper refrigerant charging during servicing, leading to abnormal system pressure and damaging the coils. I've since made it a habit to have the mechanic check for refrigerant leaks in the AC lines during every maintenance session and regularly clean the cooling grille, which has significantly extended the coil's lifespan.
The issue of compressor coil burnout starts with electromagnetic principles. The coil relies on electromagnetic induction to make the compressor rotate. If the relay in the circuit sticks or the fuse is of incorrect specification, prolonged power-on can cause overload heating. Oxidized or rusted wire connections can also lead to abnormal resistance increases, and unstable current can directly break down the insulating varnish. I've noticed that many older cars experience this problem due to refrigerant leaks causing low-pressure operation, forcing the compressor to run excessively with the coil continuously operating at its limits. Another special case is when air gets mixed in during refrigerant charging, causing system pressure disturbances and liquid slugging, which can instantly burn out the coil with its impact force. Mechanics typically start by using a multimeter to measure resistance values and then check the condenser fan speed, which usually helps pinpoint the issue.