Question about 1997 Cadillac Eldorado

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Air conditioning has been drained but won't accept new refrigerant

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  • yadayada
    yadayada Oct 06, 2010

    have you pulled a vacuum (at least 30 inches of vac) on the system with an AC evacuation pump?

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  • Cadillac Master
  • 959 Answers

Place the A/C system into a vacuum and let sit for a few hours... to see if the (negative) pressure reading changes durring that period.

With the system in a vacuum... hook up the fresh Freon bottle and let it pull the Freon into the system...
Remeber , you are loading the system with LIQUID... not gas... so the bottle should be in the correct possition to enable liquid to be transfered.

Posted on Oct 06, 2010

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The air conditioning in my 1994 toyota pickup all of a sudden stopped working the compressor won't kick on but the pulley turns, does that mean i need a new compressor?


The air conditioning system has a pressure switch that won't let the compressor engage if the refrigerant is too low. You seem to have some sort of leak ... if something slow then one of the
refill and lube/seal kits from the auto parts store should get you going. Get one with a gauge so you don't over charge. Obviously if a major leak then repairs are in order.

Jul 08, 2011 | 1994 Toyota Pickup

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My 2003 chrysler air condition is blowing hot air freon is full won't take any more


I doubt that your system uses FREON, as that is illegal, more likely the current R134a. Too much refrigerant is as bad as not enough. You need a measured amount or the system will not work correctly. It takes special tools and training to repair this area, I suggest that you get it serviced at a qualified shop. incorrect refrigerant amounts can cause system destruction, as the lubricant is moved via refrigerant.

Jun 03, 2011 | Chrysler Town and Country Cars & Trucks

1 Answer

How to take the steering wheel off a 1995 2.2 liter pontiac sunfire to change the heater core


Replacing the heater core in a Pontiac Sunfire is a very difficult and complex process. The heater core is kept within the car's heating/air conditioning module behind the instrument panel. So many other parts have to be drained and removed from the car to reach the heating/air conditioning unit that you may be better off leaving this to a professional mechanic--especially one licensed to work on air conditioning units.
Things You'll Need:

  • Wrench
  • Container
  • Air conditioning reclaimer
  • Hose clamp pliers
  • Screwdrivers
  • Heater core
  • R134a refrigerant
  • Recharge service hose
  1. Removing the Core
    • Make sure the car is cool, the front wheels are facing forward and the ignition switch is off. Drain the engine coolant by removing the drain plug at the radiator and letting the coolant pour into a clean container, then do the same at the engine block's drain plug. Recover the refrigerant by connecting an air conditioning reclaimer to the system high and low side fittings as its instructions state.
    • Disconnect the evaporator lines to the evaporator by removing its bolt and disconnect the heater hoses from the core by loosening the hose clamps with clamp pliers. Remove the drain tube from the evaporator case. Disconnect the negative battery cable.
    • Remove all the trim covers and panels from the instrument panel; some of these are screwed on and some require a flat bladed tool. Remove all air distribution ducts from the panel, the air bags, the steering wheel, the radio, the tilt and washer levers and all electrical connectors, then unscrew and remove the instrument panel from the car. Unbolt the cross vehicle beam, remove its wiring harness and remove the beam.
    • Remove the air outlet in the floor. Disconnect the wiring harness for the heater/air conditioner and the electrical connectors at the blower's motor and resistor.
    • Remove the heater/air conditioning module by removing its attaching bolts and the assembly screw. Remove the heater cover case by removing its heat stakes and screws and remove the heater core.
    • Install the replacement core into the heater/air conditioner module, then re-connect the heater core cover case. Install the assembly in the vehicle, aligning the mounting bracket to the front of the dash slot and mounting bolt hole. Reconnect the electrical connectors and wiring harness and install the floor air outlet.
    • Reinstall the cross vehicle beam and every component of the instrument panel. Reconnect the negative battery cable.
    • Install the drain tube back on the evaporator case. Connect the hater hoses and the evaporator lines.
    • Recharge the air conditioner. Connect a can of R134a refrigerant to the air conditioner's low side service fitting with a recharge service hose and a high pressure gauge to the high side fitting. Open the service hose valve while the car runs with the A/C at the max and let the vapor flow until the gauge reads between 225 and 250 PSI.
    • Refill the cooling system at the radiator filler neck. Use fresh coolant if the old liquid is dirty in any way



Dec 11, 2010 | 2005 Pontiac Sunfire

1 Answer

I just had my car serviced at a garage and now my air conditioning doesn't work. They changed the oil/filter, transmission fluid/gasket, coolant drain/new coolant, and cabin/air conditioning filter. They...


Maybe the refrigerant charge of r134a is low on pressure. Have that checked. I hope that the air conditioning tubing wasn't disturbed when all of that service was performed.

It really shouldn't have affected the a/c if they stayed away from that system.

Nov 05, 2010 | 2002 Toyota Camry

3 Answers

Looking to replace heater core


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).

Jun 25, 2010 | 2001 Jeep Grand Cherokee

1 Answer

My air conditioning blows hot air. Won't accept


Is the system low on Freon? If not, you most likely have a bad A/C compressor, or a bad low pressure switch.

Jun 10, 2009 | 1998 Ford Mustang

1 Answer

Air condition compressor won;t kick in


Most likely a loss of refrigerant ( freon ) in the system. The A/C compressor uses a low pressure switch as a SAFETY to insure it wont turn on without freon in the system. Hope this helps.

May 18, 2009 | 1999 Chevrolet Lumina

2 Answers

Need instruction on installing heater core for 2000 jeep cherokee




The heater-A/C housing assembly must be removed from the vehicle and the two halves of the housing separated for service access of the heater core, evaporator coil, blend-air door, and each of the various mode control doors.

WARNING: On vehicles equipped with airbags, refer to Airbag Systems Safety Information and Procedures. Before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury. See: Restraint Systems\Air Bag Systems\Service Precautions

REMOVAL
  1. Disconnect and isolate the battery negative cable.
  2. Remove the instrument panel from the vehicle. Refer to: Body and Frame, Interior Trim, Dashboard / Instrument Panel, Service and Repair, Instrument Panel Service Procedures, Instrument Panel Assembly Replacement, See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel Assembly
  3. If the vehicle is not equipped with air conditioning, go to Step 6. If the vehicle is equipped with air conditioning, recover the refrigerant from the refrigerant system. Refer to: Heating and Air Conditioning, Service and Repair, Procedures, Refrigerant System Recovery, See: Service and Repair\Refrigerant System Recovery
  4. Disconnect the liquid line refrigerant line fitting from the evaporator inlet tube.
    • Install plugs in, or tape over all of the opened refrigerant line fittings.
  1. Disconnect the accumulator inlet tube refrigerant line fitting from the evaporator outlet tube. See Refrigerant Line Coupler for the procedures.
    • Install plugs in, or tape over all of the opened refrigerant line fittings.
  1. Drain the engine cooling system.
  2. Disconnect the heater hoses from the heater core tubes. Install plugs in, or tape over the opened heater core tubes.
  3. Unplug the heater-A/C system vacuum supply line connector from the tee fitting near the heater core tubes.
  4. Unplug the heater-A/C unit wire harness connector, which is fastened to the heater-A/C housing next to the blower motor relay.
    1. Remove the five nuts from the heater-A/C housing mounting studs on the engine compartment side of the dash panel. Remove or reposition the evaporation canister for additional access, if required.
    2. Pull the heater-A/C housing rearward far enough for the mounting studs and the evaporator condensate drain tube to clear the dash panel holes.
    3. Remove the heater-A/C housing from the vehicle.
    INSTALLATION
    1. Position the heater-A/C housing to the dash panel. Be certain that the evaporator condensate drain tube and the housing mounting studs are inserted into their correct mounting holes.
    2. Install and tighten the five nuts onto the heater-A/C housing mounting studs on the engine compartment side of the dash panel. Tighten the nuts to 6.2 Nm (55 in. lbs.) .
    3. If the evaporation canister was repositioned during the removal procedure, reinstall it to its proper position.
    4. Connect the Heater-A/C system vacuum supply line connector to the tee fitting near the heater core tubes.
    5. Unplug or remove the tape from the heater core tubes. Connect the heater hoses to the heater core tubes and fill the engine cooling system.
    6. If the vehicle is not equipped with air conditioning, go to Step 10. If the vehicle is equipped with air conditioning, unplug or remove the tape from the accumulator inlet tube and the evaporator outlet tube fittings. Connect the accumulator inlet tube coupler to the evaporator outlet tube.
    7. Unplug or remove the tape from the liquid line and the evaporator inlet tube fittings. Connect the liquid line coupler to the evaporator inlet tube.
    8. Evacuate the refrigerant system. Refer to: Heating and Air Conditioning, Service and Repair, Procedures, Refrigerant System Evacuate, See: Service and Repair\Refrigerant System Evacuate
    9. Charge the refrigerant system. Refer to: Heating and Air Conditioning, Service and Repair, Procedures, Refrigerant System Charge, See: Service and Repair\Refrigerant System Charge
    10. Install the instrument panel in the vehicle. Refer to: Body and Frame, Interior Trim, Dashboard / Instrument Panel, Service and Repair, Instrument Panel Service Procedures, Instrument Panel Assembly Replacement, See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel Assembly
    11. Connect the battery negative cable.
    12. Start the engine and check for proper operation of the heating and air conditioning systems.
REMOVAL AND INSTALLATION

WARNING: On vehicles equipped with airbags, refer to Airbag Systems Safety Information and Procedures. Before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment and possible personal injury. See: Restraint Systems\Air Bag Systems\Service Precautions

  1. Remove and disassemble the heater-A/C housing. Refer to: Heating and Air Conditioning, Housing Assembly HVAC, Service and Repair, See: Heating and Air Conditioning\Housing Assembly HVAC\Service and Repair
  2. Lift the heater core out of the lower half of the heater-A/C housing.
  3. Reverse the removal procedures to install. Be certain that the heater core foam insulator is reinstalled

Jan 18, 2009 | 2000 Jeep Grand Cherokee

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