* Compressor Failure Causes: A locked compressor likely indicates a problem *upstream* in the system. Common causes include:
* Contamination: Debris (metal shavings from a failing compressor, dirt, etc.) circulating in the refrigerant can damage the new compressor quickly.
* Moisture: Water in the system can cause severe corrosion and freezing issues.
* System Leaks: A leak would have allowed refrigerant to escape, potentially introducing contaminants. The leak itself needs fixing, obviously.
* Consequences of Not Flushing: Installing a new compressor without addressing these underlying issues will almost certainly lead to a premature failure of the new compressor, wasting your money and time.
* What's Typically Done: A proper repair usually involves:
1. Identifying the Cause: A leak detection test is crucial.
2. Repairing Leaks: Finding and fixing any leaks in the condenser, evaporator, hoses, or seals.
3. Evacuation: Complete removal of the old refrigerant and oil from the system using a vacuum pump.
4. Flushing (Partial or Full): Using a specialized cleaner to remove any contaminants. A full flush is more thorough, often using a solvent that is carefully rinsed and then the system re-evacuated before recharging. A partial flush might be sufficient in some situations.
5. Component Inspection: Visual inspection of the other components (condenser, evaporator, expansion valve, etc.) for damage.
6. Recharging: Adding the correct amount and type of refrigerant and oil.
In short: While you *can* technically just replace the compressor without a flush, it's a gamble with a high probability of repeating the same problem and wasting money on a new compressor. The cost of a proper system service is generally a small fraction of the cost of a new compressor, making it a wise investment to prevent premature failure of the new part.
