However, I can give you a *general overview* of the steps involved. This is not a comprehensive guide and should not be used as your sole source of information:
1. Safety First:
* Disconnect the battery: This is crucial to prevent electrical shocks.
* Wear safety glasses and gloves: Protect yourself from flying debris and potential refrigerant exposure.
* Recover the refrigerant: This is absolutely essential. Releasing refrigerant into the atmosphere is illegal and harmful to the environment. You'll need an AC recovery/recharge system.
2. Access the Compressor:
* Locate the AC compressor: It's usually mounted on the engine, driven by a serpentine belt.
* Drain the AC system: Use your recovery system to remove the refrigerant.
* Remove the serpentine belt: Consult your vehicle's repair manual for the correct procedure. Often involves loosening the tensioner pulley.
* Disconnect electrical connectors: Carefully disconnect any wiring harnesses connected to the compressor clutch.
* Disconnect the AC lines: This involves disconnecting the high and low-pressure lines. Be prepared for some refrigerant to escape even with a recovery system – wear gloves and eye protection. You’ll likely need special AC line wrenches to prevent damaging the fittings.
3. Remove the Compressor Clutch:
* Remove the clutch assembly: This usually involves removing bolts securing the clutch to the compressor. This step might require specialized tools depending on the compressor design.
* Separate the clutch from the compressor shaft: There may be a retaining ring or other fasteners to remove.
4. Replace the Clutch and Bearing:
* Inspect the compressor shaft: Check for wear or damage. If the shaft is damaged, you'll likely need a new compressor.
* Install the new bearing: This often requires pressing the new bearing onto the compressor shaft using a bearing press. Improper installation can severely damage the bearing.
* Install the new clutch: Ensure it's correctly aligned and securely fastened.
5. Reassembly:
* Reverse the disassembly process: Reconnect the AC lines, electrical connectors, and serpentine belt. Remember to tighten all fasteners to the correct torque specifications (found in your repair manual).
* Evacuate and recharge the AC system: This involves using a vacuum pump to remove any air and moisture from the system, followed by adding the correct amount of refrigerant. Again, a professional-grade AC system service kit is vital.
Important Considerations:
* Repair Manual: Obtain a factory service manual or a reputable repair manual specifically for your 2002 Chevrolet Blazer. This manual will provide detailed instructions and torque specifications.
* Specialized Tools: You'll need specialized tools, including AC line wrenches, a bearing press, and possibly other specialized tools depending on the compressor design.
* Refrigerant Handling: Improper handling of refrigerant is dangerous and illegal.
In conclusion: This is a complex repair. Unless you have significant experience working on automotive AC systems, I strongly recommend taking your Blazer to a qualified mechanic. Improper repair can lead to further damage, injury, and environmental harm.
