A/C Compressor and Clutch Assembly
Note. Internal A/C compressor components are not serviced separately. The variable scroll compressor is serviced only as an assembly. The A/C clutch, A/C clutch pulley and the A/C clutch field coil are serviceable.
The variable scroll A/C compressor has the following characteristics
- A variable capacity function controlled by a suction pressure sensing device.
- A fixed and orbiting scroll to provide refrigerant compression.
- A non-serviceable shaft seal.
- The A/C compressor uses PAG Refrigerant Compressor Oil YN-12-D WSH-M1C231-B. This oil contains special additives necessary for the A/C compressor.
The A/C compressor contains a thermal cutout switch which senses the compressor housing temperature. The switch will disengage the A/C compressor clutch if the housing temperature exceeds 120°C (247°F).
Scheme 27
The magnetic A/C clutch has the following characteristics
- It drives the compressor shaft.
- When battery positive voltage (B+) is applied to the A/C clutch field coil, the clutch disc and hub assembly is drawn toward the A/C clutch pulley.
- The magnetic force locks the clutch disc and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
- When B+ is removed from the A/C clutch field coil, springs in the clutch disc and hub assembly move the clutch disc away from the A/C clutch pulley.
Climate Control Assembly (EMTC Module)
The climate control assembly integrates the temperature control, airflow mode selection, A/C request button, recirculated air request button and rear defog switch into a single unit.
The temperature control switch setting determines air temperature. Movement of the temperature display from COOL (blue) to WARM (red) causes a corresponding movement of the temperature blend door and determines the air discharge temperature that the air distribution system will maintain. The temperature control switch is an integral part of the climate control assembly and cannot be separately replaced.
The A/C request button determines A/C compressor operation, except when the function selected is in the OFF, MAX or DEFROST mode. The A/C request button is an integral part of the climate control assembly and cannot be separately replaced.
The recirculated air request button can select recirculated air in any mode except DEFROST, and fresh air in any mode except MAX A/C or OFF.
The rear defog button signals activation of the heated backlight. The rear defog button is an integral part of the climate control assembly and cannot be installed separately.
The EMTC module is not equipped with self-test capabilities.
Thermostatic Expansion Valve Manifold and Tube Assembly
| Item | Specification |
|---|---|
| PAG Refrigerant Compressor Oil (R-134a Systems) YN-12-D | WSH-M1C231-B |
MATERIAL
