How to remove air from system - Cars & Trucks

DESCRIPTION A manual temperature control (MTC) single zone type heating-A/C system or a manually controlled heater-only system is standard equipment on this model, depending on market.
To maintain the performance level of the heating, ventilation and air conditioning (HVAC) system, the engine cooling system must be properly maintained. The use of a bug screen is not recommended. Any obstructions in front of the radiator or A/C condenser will reduce the performance of the A/C and engine cooling systems.
The engine cooling system includes the radiator, thermostat, radiator hoses and the engine coolant pump. Refer to 7 - Cooling for more information before opening or attempting any service to the engine cooling system.

All vehicles are equipped with a common heater, ventilation and air conditioning (HVAC) housing (1). The heating-A/C system combines heating, ventilating and A/C (if equipped) capabilities in a single HVAC housing mounted within the passenger compartment beneath the instrument panel. The HVAC housing includes:

1. Mode-air doors (2)
2. A/C evaporator (A/C system only) (3)
3. Recirculation-air door and actuator (A/C system only) (4)
4. Blower motor (5)
5. Mode control cable (6)
6. Temperature control cable (7)
7. Heater core (8)
8. Blend-air door (9)

On heater-only systems, the A/C evaporator is omitted from the HVAC housing and is replaced with an air restrictor plate.
Based upon the system mode selected, conditioned air can exit the standard heater-only or optional heater-A/C housing through one or a combination of the three main housing outlets: defrost, panel or floor. The defrost and panel outlets are located on the top of the HVAC air distribution housing and the floor outlets are located on each side of the distribution housing. Once the conditioned air exits the HVAC housing, it is further directed through molded plastic ducts to the various outlets within the vehicle interior. These outlets and their locations are as follows:

1. Defroster Outlet- A single large defroster outlet is located in the center of the instrument panel top cover, near the base of the windshield.
2. Side Window Demister Outlets- There are two side window demister outlets, one is located at each outboard end of the instrument panel top cover, near the belt line at the A-pillars.
3. Panel Outlets- There are four panel outlets in the instrument panel, one located near each outboard end of the instrument panel facing the rear of the vehicle and two located near the top of the instrument panel center bezel.
4. Front Floor Outlets- There are two front floor outlets, one located on each side of the center tunnel near the dash panel.
5. Rear Floor Outlets- There are two rear floor outlets, one located on each side of the floor panel center tunnel near the front of each rear seat foot well.
6. REMOVAL
   WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury.
   
   
   NOTE: Illustration shown with instrument panel removed for clarity. (Refer to 23 - Body/Instrument Panel/BEZEL, Instrument Panel - Removal).(Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal).(Refer to 23 - Body/Instrument Panel/COVER, Steering Column Opening - Removal). 5. Remove the screw (1) that secures the temperature control cable (2) to the left side of the HVAC air distribution housing (3). 6. Disconnect the temperature control cable from the blend door pivot lever (4) and remove the cable from the vehicle.
   REMOVAL
   
   WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal).(Refer to 08 - Electrical/Clock - Removal).(Refer to 08 - Electrical/Power Windows/SWITCH, Power Window - Removal).(Refer to 24 - Heating and Air Conditioning/Distribution/OUTLET, Air - Removal).

Sensor - Front Crash Removal
WARNING: Vehicle sensor orientation is critical for proper operation. If a vehicle equipped with an air bag supplemental restraint system (SRS) is involved in a collision, inspect the sensor mounting bracket and wiring pigtail for deformation. Replace and properly position the sensor or any other damaged supplemental restraint system (SRS) components whether or not the air bag is deployed.
WARNING: Always wear safety glasses when repairing an air bag supplemental restraint system (SRS) vehicle and when handling an air bag module. This will reduce the risk of injury in the event of an accidental deployment.
WARNING: To reduce the risk of personal injury, do not use any memory saver devices.
NOTE: The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: Repair is made by installing a new part only. If the new part does not correct the condition, install the original part and perform the diagnostic procedure again.

1. Depower the system. For additional information, refer to Supplemental Restraint System (SRS) Depowering and Repowering in this section.

1. Remove the radiator upper sight shield (8C291).

1. Remove the air bag sensor.
   1. Disconnect the air bag sensor electrical connector.
   1. Remove the three screws.
   1. Remove the air bag sensor.
   2. SECTION 501-20B: Supplemental Restraint System 2000 Town Car Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 06/10/2004 Sensor - Side Crash Removal
      WARNING: Vehicle sensor orientation is critical for proper system operation. If a vehicle equipped with an air bag supplemental restraint system (SRS) is involved in a collision, inspect the sensor mounting bracket and wiring pigtail for deformation. Replace and properly position the sensor or any other damaged supplemental restraint system (SRS) components whether or not the air bag is deployed.
      WARNING: Always wear safety glasses when repairing an air bag supplemental restraint system (SRS) vehicle and when handling an air bag module. This will reduce the risk of injury in the event of an accidental deployment.
      WARNING: To reduce the risk of personal injury, do not use any memory saver devices.
      NOTE: The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
      NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
      NOTE: Repair is made by installing a new part only. If the new part does not correct the condition, install the original part and perform the diagnostic procedure again.
      NOTE: Left side is shown, right side is similar.
      NOTE: The side crash sensors are located under the carpet beneath the front seats.
      
      1. Position the seat to gain access to all fasteners.
      1. Depower the system. For additional information, refer to Supplemental Restraint System (SRS) Depowering and Repowering in this section.
      1. Remove the front seat. For additional information, refer to Section 501-10 .
      1. Remove the safety belt anchor bolt cover.
      1. Remove the bolt and the safety belt anchor.
      1. Remove the front and rear door scuff plates.
      1. Remove the lower B-pillar trim panel.
      1. Remove the carpet to access the side crash sensor.
      1. Remove the side crash sensor.
         1. Remove the retaining bolts and position the side crash sensor in order to disconnect the electrical connector.
         1. Disconnect the electrical connector.
         1. Remove the side crash sensor and bracket.

FIRST YOU TURN OFF AIR SUSPENSION SYSTEM.YOU LOCATE THE AIR SUSPENSION SWITCH WHICH IS ON THE RIGHT KICK PANEL.WHEN YOU TURN OFF AIR SUSPENSION SYSTEM.YOU LOOSEN REAR LUG NUTS THEN SAFELY RAISE AND SUPPORT VECHICLE. REMOVE TIRE.REMOVE ELECTRICAL CONNECTOR FROM THE AIR SPRING SOLENOID.THEN SLOWLY DISCONNECT AIR LINE FROM SOLENOID SLOWLY BLEED AIR FROM SOLENOID.

Cherokee, Grand Cherokee, 1999-2005

Removal & Installation

1. Disconnect and remove the negative battery.
   CAUTION After disconnecting the negative battery cable, wait 2 minutes for the driver-s/passenger-s air bag system capacitor to discharge before attempting to do any work around the steering column or instrument.
2. Drain the cooling system into a clean container for reuse.
3. Remove the instrument panel by performing the following procedure:
   1. Turn the steering wheel in the straight-ahead position.
   2. Remove the knee blocker from the instrument panel.
   3. Remove the steering column; do not remove the air bag module, the steering wheel or switches from the steering column.
   4. From under the driver-s side of the instrument panel, disconnect the following items:
      
      Instrument panel wiring harness connector from the 100-way wiring harness connector at the left side of the inner panel. Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side.
   5. Remove the glove box.
   6. Reaching through the glove box opening, disconnect the following items:
      
      Two halves of the heater/air conditioning system vacuum harness connector. Instrument panel wiring harness connector from the heater/air conditioning system wiring harness connector. Instrument panel wiring harness connector from the passenger-s side air bag module wiring harness connector. Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side). Two halves of the radio antenna coaxial cable connector. Two instrument panel wiring harness connectors from the passenger air bag ON/OFF switch wiring harness connector. Passenger-s side air bag ON/OFF switch wiring harness from the retainer clip on the plenum bracket that supports the heater/air conditioning housing just inboard of the fuse block module. Two lower passenger-s side air bag module bracket-to-dash panel nuts.
   7. Remove the upper cover from the instrument panel.
   8. Remove the 3 instrument panel-to-door hinge pillar screws.
   9. Remove the 4 upper instrument panel-to-dash nuts.
   10. Using an assistant, remove the instrument panel from the vehicle.
       
4. If equipped with air conditioning, discharge and recover the air conditioning system refrigerant.
5. Disconnect the refrigerant lines from the evaporator. Plug the refrigerant openings to prevent evaporation.
6. Disconnect the heater hoses from the heater core tubes.
7. Disconnect the heater/air conditioning system vacuum supply line connector from the T-fitting near the heater core tubes.
8. In the engine compartment, remove the 5 heater/air conditioning housing-to-chassis nuts. If necessary, loosen the battery hold-downs and reposition the battery for access.
9. Remove the cowl plenum drain tube from the heater/air conditioning housing stud; it-s located behind the cylinder head on the cowl.
10. From the bottom of the heater/air conditioning housing, remove the floor duct.
11. On the passenger side, remove the heater/air conditioning housing-to-plenum bracket screw.
12. Pull the heater/air conditioning housing down far enough to clear the defrost/demist and fresh air ducts, then, rearward far enough to clear the mounting studs and the evaporator drain tube to clear the dash panel holes.
13. Remove the heater/air conditioning housing assembly from the vehicle.
14. Remove the heater/air conditioning housing upper case.
15. Lift the heater core from the lower half of the heater/air conditioning housing.
    

To install:

1. Assemble the heater core into the lower half of the heater/air conditioning housing.
2. Install the heater/air conditioning housing upper case.
3. Install the heater/air conditioning housing assembly to the vehicle.
4. On the passenger-s side, install the heater/air conditioning housing-to-plenum bracket screw.
5. At the bottom of the heater/air conditioning housing, install the floor duct.
6. Install the cowl plenum drain tube to the heater/air conditioning housing stud; it-s located behind the cylinder head on the cowl.
7. In the engine compartment, install the 5 heater/air conditioning housing-to-chassis nuts.
8. Connect the heater/air conditioning system vacuum supply line connector to the T-fitting near the heater core tubes.
9. Connect the heater hoses to the heater core tubes.
10. Connect the refrigerant lines to the evaporator.
11. If equipped with air conditioning, evacuate and charge the air conditioning system refrigerant.
12. Install the instrument panel by performing the following procedure:
    1. Using an assistant, install the instrument panel to the vehicle.
    2. Install the 4 upper instrument panel-to-dash nuts.
    3. Install the 3 instrument panel-to-door hinge pillar screws.
    4. Install the upper cover to the instrument panel.
    5. Reaching through the glove box opening, connect the following items.
       
       Two lower passenger-s side air bag module bracket-to-dash panel nuts. Passenger-s side air bag ON/OFF switch wiring harness to the retainer clip on the plenum bracket that supports the heater/air conditioning housing just inboard of the fuse block module. Two instrument panel wiring harness connectors to the passenger air bag ON/OFF switch wiring harness connector. Two halves of the radio antenna coaxial cable connector. Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side). Instrument panel wiring harness connector to the passenger-s side air bag module wiring harness connector. Instrument panel wiring harness connector to the heater/air conditioning system wiring harness connector. Two halves of the heater/air conditioning system vacuum harness connector.
    6. Install the glove box.
    7. Under the driver-s side of the instrument panel, connect the following items:
       
       Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side. Instrument panel wiring harness connector to the 100-way wiring harness connector at the left side of the inner panel.
    8. Install the steering column.
    9. Install the knee blocker to the instrument panel.
    
    
13. Connect and remove the negative battery.
14. Refill the cooling system.
15. Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.

Hope helps (remember rated this).

The air bag module is under the center console.Before any repair make sure and disconnect the battery and remove the air bag fuse.Do not remove or disconnect anything in the air bag system for at least a half hr.This system can go off for up to 15 to 20 minutes after power is removed.You also have to watch out for static electricity.This can also make the bags go off.You have to be very careful around air bag systems.Hope this helps.Good luck.

REMOVAL PROCEDURE 1. Remove the fuel injector sight shield. 2. Drain the cooling system. Refer to Draining and Filling Cooling System in Cooling System. 3. Use J 38185 in order to position aside the heater hose inlet and outlet clamps at the heater core. 4. Disconnect the inlet and outlet heater hose from the heater core. 5. Remove the RH Instrument Panel Closeout/Insulator panel. 6. Remove the LH Instrument Panel Closeout/Insulator panel 7. Remove the floor carpet. 8. Remove the rear floor air outlet duct from the holes in the floor reinforcement. 9. Disconnect the rear floor air outlet duct from the heater air outlet cover. 10. Remove the rear floor air outlet duct. 11. Remove the heater air outlet cover screws (2). 12. Remove the heater air outlet cover heat stakes (1) with a small chisel. 13. Remove the heater air outlet cover from the HVAC module assembly. 14. Remove the heater core cover screws (2). 15. Remove the heater core cover heat stakes (1) with a small chisel. 16. Remove the heater core cover from the HVAC module assembly. 17. Remove the heater core from the HVAC module assembly. 18. Remove the heater core foam seal (1) from the HVAC module assembly

This first post is WITH AN AIR BAG:



With Air Bag Before removing the steering wheel, disable the air bag system
Disarming the System To disarm the air bag system, simply disconnect the negative battery cable from the battery. Isolate the battery cable by taping up any exposed metal areas of the cable. This will keep the cable from accidentally contacting the battery and causing deployment of the air bag. Allow the system capacitor to discharge for at least 2 minutes, although 10 minutes is recommended, to allow for the dissipation of any residual energy.

CAUTION Before removing the steering wheel, disable the air bag system (refer to Section 6). Failure to do so could result in accidental air bag deployment and possible injury.

1. Disconnect the negative battery cable and disable the air bag system.
   
2. Set the front tires in a straight-ahead position.
   

Exploded view of the air bag module mounting

1. Remove the air bag module retaining nuts from behind the steering wheel.
   
2. Remove the air bag module.
   
3. If equipped, remove the cruise control switch.
   
4. Disconnect the horn wiring.
   
5. Remove the steering wheel retaining nut.
   
6. Scribe a line mark on the steering wheel and steering shaft if there is not one already.
   

Use a puller to separate the wheel from the column

1. Remove the steering wheel using a suitable puller.
   

To install:

1. To install, align the scribe marks on the steering shaft with the steering wheel.
   
2. Ensure the wheel compresses the 2 locktabs on the clockspring.
   

YOU HAVE TO HAVE THE AIR CONDITIONER SYSTEM DISCHARGED AT THE DEALERSHIP. OR AIR CONDITIONER REPAIR SHOP.YOU ALSO HAVE TO DISABLE YOUR AIR BAGS.YOU HAVE TO REMOVE THE EVAPORATOR HOUSING TO GET TO THE EXPANSION VALVE.YOU HAVE TO REMOVE THE GLOVE BOX AND GLOVE BOX FRAME.TO GET OUT THE EVAPORATOR HOUSING.REMOVE EVAPORATOR CORE FROM HOUSING TO REMOVE EXPANSION VALVE.THIS JOB IS REALLY A DEALERSHIP JOB.YOUR AC SYSTEM HAS TO BE EVACUATED CHARGED AND LEAK TEST.BEFORE YOUR AC SYSTEM WORK PROPERLY.

SECTION 501-20B: Occupant Restraints — Passive — Supplemental Air Bag System 2000 Villager Workshop Manual REMOVAL AND INSTALLATION Module —Driver Air Bag Removal
WARNING: The backup power supply energy must be depleted before any air bag component service is performed. To deplete the backup power supply energy, disconnect the battery ground cable and wait three minutes.
NOTE: Repair is made by installing a new part only. If the new part does not correct the condition, install the original part and perform the diagnostic procedure again. If the vehicle was in a frontal collision and the air bag did not deploy, the air bag may not have been needed. Complete a diagnosis of the air bag system before installing a new driver side air bag module (043B13). Refer to Diagnosis and Testing in this section.

1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414-01 .

1. Remove the two driver air bag module retaining bolt access covers (one shown).

1. Remove the steering wheel bottom cover to access the driver air bag module electrical connector.

1. Disconnect the driver air bag module electrical connector.

1. CAUTION: After removing, discard the driver side air bag module bolts and install new driver air bag module bolts during installation.
   Remove the two driver air bag module retaining bolts (one shown) and discard.

1. Remove the driver air bag module.
   1. Separate the driver air bag module from the steering wheel and disconnect the horn pad switch.
   1. Remove the driver air bag module.

p1402 - dm-tl air pump motor is shorted or disconnected.

2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.

service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected.
p1403 - dm-tl changeover valve is shorted or disconnected
perform the suggested repair
1. inspect for water in the dmtl by removing the 90° air inlet elbow and looking into the air chamber. if water or corrosion is present, replace the dm-tl p/n 31440-25500; air filterp/n 31453-25500; and pipe assembly p/n 31454-25500if corrosion is in the pipe. see detailed instructions on page3 for air filter replacement.
2. inspect for underbody coating sprayed into connector m52 at dm-tl. if underbody coating is present on the male or female connector, spray with electrical contact cleaner to remove the undercoating.

air filter (dm-tl) replacement instructions

1. disconnect the 90° elbow from the top of the dmtl and insert a clean rag into either the elbow or thedmtl inlet connector.
2. disconnect the dmtl electrical connector.
   
1. disconnect the 2 hoses at the front of the canister (caution: silicone hoses tear/puncture easily).
   
2. remove canister assembly and dm-tl as a unit (3 mounting nuts).
   
3. disconnect the 2 hoses from the metal transfer pipes.
   
4. remove the canister, air filter, and metal tube assembly from the canister protector by removing the 3 mounting nuts.
   
5. disconnect the hose at the air filter.
   
6. remove the air filter mounting nut and remove the air filter.
   
7. install a new air filter.
   
8. reassemble in reverse order.