HVAC Systems - Service Information: Maintenance Jeep Compass I

COMPRESSOR OIL DRAIN PROCEDURE - DENSO 5SE12 A/C COMPRESSOR

Note. When replacing multiple A/C system components, refer to REFRIGERANT OIL CAPACITIES - 5SE12 COMPRESSOR or REFRIGERANT OIL CAPACITIES - 6SEU16 COMPRESSOR . to determine how much oil should be removed from the new A/C compressor (example: new 5SE12 A/C compressor and an accumulator requires 80 ml. (2.7 oz.) of oil to be added to the system. 120 ml. (4.1 oz.) of oil is in new compressor. 120 ml. (4.1 oz.) minus 80 ml. (2.7 oz.) equals 40 ml. (1.4 oz.) oil to be drained from new compressor).

If the Denso 5SE12 A/C compressor is being replaced, some refrigerant oil must first be drained from the new A/C compressor. The 5SE12 A/C compressor is filled with 120 milliliters (4.1 oz.) from the factory. Drain 70 milliliters (2.4 oz.) of refrigerant oil from the new 5SE12 compressor. Use the following procedure to drain and measure refrigerant oil from the Denso 5SE12 A/C compressor.

Scheme 5

Scheme 6

1. Place the new A/C compressor (1) on a workbench.
2. Position the A/C compressor so that the refrigerant oil can drain out of the suction port (2) into a suitable clean measured container. Hold the A/C compressor in this position until no more oil comes out of the compressor port.
3. Reposition the A/C compressor (1) so that the pulley (2) is facing upward and slowly rotate the compressor pulley clockwise one full turn. CAUTION: The 5SE12 A/C compressor is filled with 120 milliliters (4.1 oz.) from the factory. Drain 70 milliliters (2.4 oz.) of refrigerant oil from the new 5SE12 compressor. The 6SEU16 A/C compressor is filled with 100 milliliters (3.4 oz.) from the factory. Drain 60 milliliters (2 oz.) of refrigerant oil from the new 6SEU16 compressor.
4. Repeat steps 2 and 3 at least seven times or until the required amount of refrigerant oil is drained from the new compressor. CAUTION: Failure to properly adjust the refrigerant oil level prior to installation of a new compressor can prevent the A/C system from operating as designed and cause serious compressor damage.
5. Install the new A/C compressor onto the engine. See «INSTALLATION»(ref-304323-S19885444712008110700000) .

COMPRESSOR OIL DRAIN PROCEDURE - DENSO 6SEU16 A/C COMPRESSOR

If the Denso 6SEU16 A/C compressor is being replaced, some refrigerant oil must first be drained from the new A/C compressor. The 6SEU16 A/C compressor is filled with 100 milliliters (3.4 oz.) from the factory. Drain 60 milliliters (2.1 oz.) of refrigerant oil from the new 6SEU16 compressor. Use the following procedure to drain and measure refrigerant oil from the Denso 6SEU16 A/C compressor.

Scheme 7

1. Place the new A/C compressor (2) on a workbench and remove the drain plug (1). CAUTION: The 6SEU16 A/C compressor is filled with 100 milliliters (3.4 oz.) from the factory. Drain 60 milliliters (2 oz.) of refrigerant oil from the new 6SEU16 compressor when replacing only the compressor. NOTE: When replacing multiple A/C system components, refer to «REFRIGERANT OIL CAPACITIES - 5SE12 COMPRESSOR»(ref-304323-S18099495152008110700000) or «REFRIGERANT OIL CAPACITIES - 6SEU16 COMPRESSOR»(ref-304323-S20208732882008110700000) . to determine how much oil should be removed from the new A/C compressor (example: new 6SEU16 A/C compressor and an accumulator requires 60 ml. (2.1 oz.) of oil to be added to the system. 100 ml. (3.4 oz.) of oil is in new compressor. 100 ml. (3.4 oz.) minus 60 ml. (2.1 oz.) equals 40 ml. (1.4 oz.) oil to be drained from new compressor).
2. Position the A/C compressor so that the refrigerant oil can drain out of the drain port into a suitable clean measured container. Hold the A/C compressor in this position until the required amount of refrigerant oil is drained from the new compressor. CAUTION: Failure to properly adjust the refrigerant oil level prior to installation of a new compressor can prevent the A/C system from operating as designed and cause serious compressor damage.
3. Reinstall the drain plug. Tighten the drain plug securely.
4. Install the new A/C compressor onto the engine. See «INSTALLATION»(ref-304323-S19885444712008110700000) .

TUBE-CONDENSATION DRAIN

1. Pull back the floor carpet to gain access to the condensation drain tube (2) located on the left side of the vehicle at the front right of the foot well.
2. Disconnect the condensation drain tube from the bottom of the HVAC housing (1).
3. Remove the condensate drain tube from the rubber grommet (3) in the front floor panel (4).
4. If required, remove the rubber grommet from the floor panel.

1. If removed, install the rubber grommet (3) onto the driver side front floor panel (4). Make sure the grommet is fully engaged to the floor panel.
2. Connect the condensation drain tube (2) onto the drain port located on the bottom of the HVAC housing (1).
3. Install the condensation drain tube into the rubber grommet.
4. Reinstall the floor carpet. Refer to «INSTALLATION»(ref-304328-S27183027772008110700000) .

Scheme 8

Note. LHD model shown in illustration. RHD model similar.

An electric positive temperature coefficient (PTC) heater unit (1) is used on vehicles when equipped with the 2.0L diesel engine. The PTC heater unit aids in passenger compartment heating by compensating for the lower engine coolant temperatures produced by the diesel engine. The PTC heater unit is mounted in the HVAC air distribution housing, downstream of the heater core and is controlled by the diesel engine control module (ECM) and the totally integrated power module (TIPM) through two relays in diesel accessory fuse/relay block located below the left front fender.

The PTC heater consists of a molded plastic mounting plate (2) with an integral wire connector receptacle (3). Concealed behind the mounting plate are four heating elements with fins (4) that transfer the heat produced by the PTC heater to the conditioned air flowing within the air distribution housing. Two retaining tabs (5) are molded onto the opposite end of the heater unit to support the heater unit inside the air distribution housing. The PTC heater unit is connected to the vehicle electrical system through the instrument panel wire harness.

The PTC heater unit is accessed for service by removing the instrument panel.