2. Place the vehicle on a lift.
3. Fold back the clamp A of the brake and fuel pipes. Unscrew the nut B securing the flanges of the outlet and inlet pipes to the thermostatic valve.
4. Move the pipe flanges away from the thermostatic valve.
5. Remove the two bolts securing the thermostatic valve to the evaporator pipe flange.
6. Remove the valve from the pipeline flange.
Warning: If solid sediment particles are found in the valve orifice (usually in the form of small balls), this means that the receiver filter element filled with desiccant granules has been destroyed (silica gel). Replacing only the thermostatic valve in this case will not give a positive result. It will be necessary to replace the receiver cartridge with flushing the system. This rather labor-intensive procedure can only be performed in a specialized service center using special technological equipment.
7. Install new O-rings on the evaporator pipe flange and lubricate them with compressor oil.
8. Install the thermostatic valve in the reverse order of removal. Tighten the valve mounting bolts to 4.5 Nm. Do not apply excessive force when tightening the valve mounting bolts.
9. Fill the air conditioning system with refrigerant at a specialized center for servicing automotive air conditioners.
The original article is on the website: «ChevyMan»