However, if you're determined to do it yourself, here's a general outline. Remember this is a *general* guide and specific steps may vary slightly depending on your exact Blazer's configuration. Always consult a repair manual specific to your vehicle year and model for precise instructions and torque specifications.
1. Safety First:
* Safety Glasses: Protect your eyes from flying debris.
* Gloves: Protect your hands from sharp edges and refrigerant.
* Proper Ventilation: Work in a well-ventilated area. Refrigerant is harmful if inhaled.
* Refrigerant Recovery: You MUST recover the refrigerant from the system using a refrigerant recovery machine. Releasing refrigerant into the atmosphere is illegal and harmful to the environment. This requires specialized equipment and knowledge.
* Disconnect the Battery: This prevents accidental short circuits.
2. Preparation:
* Gather Tools: You'll need a variety of tools, including wrenches (metric), sockets, ratchets, a compressor clutch tool, a refrigerant recovery machine, a vacuum pump, possibly a torque wrench, and possibly a flare nut wrench set.
* Consult a Repair Manual: A Haynes or Chilton manual for your specific year and model S-10 Blazer will be invaluable. It will show you exactly where everything is located and the correct procedures.
3. Removal Process (General Steps):
* Recover Refrigerant: Use your recovery machine to safely remove the refrigerant from the system.
* Disconnect the Electrical Connector: Disconnect the electrical connector from the compressor clutch.
* Disconnect the Lines: Carefully disconnect the high-pressure and low-pressure refrigerant lines. These connections are often flare fittings, requiring careful loosening to avoid damaging the lines. Keep them capped to prevent contamination.
* Remove the Compressor Mounting Bolts: Locate and remove the bolts holding the compressor to the engine block or bracket.
* Remove the Compressor: Carefully remove the compressor from the vehicle.
4. Installation Process (General Steps):
* Install the New Compressor: Mount the new compressor in the same location as the old one.
* Connect the Lines: Carefully connect the high-pressure and low-pressure refrigerant lines to the new compressor. Tighten connections to the manufacturer's specifications.
* Connect the Electrical Connector: Reconnect the electrical connector to the compressor clutch.
* Vacuum the System: Use a vacuum pump to evacuate the system of air and moisture. This is crucial for proper A/C function and to prevent compressor damage.
* Recharge the System: Use your refrigerant recovery machine to charge the system with the correct amount and type of refrigerant (refer to your repair manual).
5. Final Steps:
* Check for Leaks: After recharging, check for any leaks using leak detection equipment.
* Test the System: Start the vehicle and test the A/C system to ensure proper cooling.
Important Considerations:
* O-rings and Seals: Replace all O-rings and seals on the refrigerant lines and compressor during installation. These are critical for preventing leaks.
* Clutch Alignment: Ensure the compressor clutch is properly aligned before tightening.
* Proper Refrigerant: Use the correct type and amount of refrigerant specified for your vehicle. This information is typically found in your repair manual or on a sticker under the hood.
This is a complex procedure. Again, I strongly recommend you take your vehicle to a qualified mechanic. Incorrect installation can damage your A/C system, potentially leading to expensive repairs or injury. The cost of professional repair is almost certainly less than the cost of mistakes made during DIY replacement.
