Question about 1999 Chevrolet Suburban

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Will a kinked but still open evaporater core inlet tube on a 1999 suburban still function properly?

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If it is a very minor "dent" it should be fine, but if it restricts the freon too much it will make the system pressure wrong and the AC will not work properly.

Posted on Dec 13, 2009

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1 Answer

How to install a oficetube on a 1987 ford f150


Orifice tube is accessed in the evaporater core High side at the firewall (small port) NOTE some models require the entire line from the Condenser to Evap core replaced as the orifice tube is crimped in the line and IS NOT serviceable

Aug 30, 2011 | 1987 Ford F 150

1 Answer

Our front ac is not working and back is cold in our 1999 GMC suburban, we tried putting freon and it didn't work


Dual zone front/rear ac systems have 2 evaporator cores. And 2 orifice tubes, which are just inline
filters. Either your front evaporator core or orifice tube is probably stopped up.

Sometimes you can get to the evaporator cores without removing them from the vehicle, and clean it.
Evaporator cores do get stopped up sometimes, because the blower motor pulls in air with dust and debris from outside, and the air is cooled when it passes through the evaporator core.

But evaporator cores are a nightmare to replace, you usually have to remove lots of stuff under the dash and lots of stuff under the hood to remove them.

Aug 12, 2011 | 1999 GMC Suburban

1 Answer

Heater core removal 2000 mustang gt


The first thing your going to have to do is take it to a repair shop and have the air conditioning system discharged.Disconnect the battery and drain the cooling system.Disconnect the heater hoses at the firewall and also disconnect and plug the evaporator tubes at the firewall and also plug the heater core tubes so that you dont spill any coolant when you take it out.Cap the evaporator tubes so that you dont get any dirt or water in them.Next you want to remove the instrument panel.Then disconnect the main vacuum line from the heater/evaporater housing to the engine.This is located above the rear of the right valve cover.Then pull the hose through the firewall into the inside of the car.Remove the heater/evaporater housing screws which includes a bolt near the top center of the unit,a nut at the top righ,a bolt near the bottom,and a nut on the engine side of the firewal.Make sure that there are no other wires or hoses connected to the housing and then pull the heater/evaporater housing out from under the cowl and remove it from the vehicle.Take out the 4 screws and the heater core cover then you can take out the heater core.Be very carefull not to tear the foam sealing material.To install it reverse everything.hope that this will help a little.

Apr 10, 2011 | 2000 Ford Mustang

1 Answer

Im installing a new a/c compressor and i need to add oil and i need to know how much. Its a 1997 suburban with the rear evaporater.


11 OZ of PAG 150 oil Follow Compressor instructions to see how much to add to New Compressor and the balance should be poured into the NEW Accumulator and change the orifice tube in the front near Y split after the condensor on the high pressure side.

Jul 29, 2010 | 1997 Chevrolet Suburban

1 Answer

Hey I have what looks like to be radiator fluid coming out of my heater floor vents but i am not sure if it is that or Freon? Any idea what could be wrong?


If it is cool clear water and does not smell like coolant then it is the drain tube plugged up for the AC evaporater/core codensation, and it drains out towards the bottom of the passenger side fire-wall and the drain tube is easily visible from under the vehicle.

It is a normal condition for the AC to produce condensation if the AC is functioning properly.

If it is warm or hot coolant, and it smells like coolant, then the heater core is leaking, and the cooling system should be getting low, and the engine should be running hot.

Jun 12, 2010 | 1998 GMC Sierra

1 Answer

1999 s-10 blazer heater is not hot . put in brand new thermostat full of coolant a/c works fine


Check operation of the heater core coolant control valve and associated remote control mechanism.
Check heater coolant hoses are not kinked or crushed,
Check that both inlet and return heater hose is equally warm, as this indicates coolant flow through the heater core.
If no coolant flow:-
Check cooling system is correctly filled, taking care to bleed off any air locks from the system as necessary (with heater coolant valve open);
Check heater core is not blocked- if blocked you may be able to backflush.

Dec 05, 2009 | Chevrolet S 10 Cars & Trucks

2 Answers

Leak in eavaporer coil how do i get to it


The evaporator coil is located in the heater-A/C housing, under the instrument panel.

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 SystemsAir Bag SystemsService Precautions

REMOVAL
  1. Disconnect and isolate the battery negative cable.
  2. Remove the instrument panel from the vehicle.
  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.
  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.
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.
  9. Charge the refrigerant system.
  10. Install the instrument panel in the vehicle.
  11. Connect the battery negative cable.
  12. Start the engine and check for proper operation of the heating and air conditioning systems.



Jul 27, 2009 | 2000 Jeep Cherokee

1 Answer

2002 grand cherokee leaking heatr core





REMOVAL

WARNING:
  • ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (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 TAKE THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
  • REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PERFORMING THE FOLLOWING OPERATION. See: Heating and Air Conditioning\Service Precautions
  1. Remove the HVAC housing from the vehicle. See: Heating and Air Conditioning\Housing Assembly HVAC\Service and Repair
  2. Remove the foam gasket surrounding the core tubes. NOTE: Notice the orientation of the irregularly shaped gasket on the tubes. The gasket must be placed correctly to ensure proper sealing against the body during reinstallation
    1. Remove the screws and retainers that secure the heater core and tubes to the HVAC housing.
    2. Remove the mode door actuator if necessary for clearance to remove the core.
      1. Lift the heater core straight up and out of the HVAC housing.
      2. When replacing individual tubes, loosen and remove the round tube-to-core clamp, and pull tube from core.
      INSTALLATION

      WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PERFORMING THE FOLLOWING OPERATION. See: Heating and Air Conditioning\Service Precautions

      Any kinks or sharp bends in the refrigerant plumbing will reduce the capacity of the entire air conditioning system. Kinks and sharp bends reduce the flow of refrigerant in the system. A good rule for the flexible hose refrigerant lines is to keep the radius of all bends at least ten times the diameter of the hose. In addition, the flexible hose refrigerant lines should be routed so they are at least 80 millimeters (3 inches) from the exhaust manifold.

      High pressures are produced in the refrigerant system when the air conditioning compressor is operating. Extreme care must be exercised to make sure that each of the refrigerant system connections is pressure-tight and leak free. It is a good practice to inspect all flexible hose refrigerant lines at least once a year to make sure they are in good condition and properly routed.


      1. When installing individual tubes, insert tube into core ensuring that tube O-ring is seated in core and not pinched. Hold tube in seated position while installing the round tube-to-core clamp. NOTE: The round tube-to-heater-core clamp should be left loose enough to turn the tube in the core. Position the core in the housing, and then tighten the tube-to-heater-core clamp after orienting the tubes to the molded HVAC housing.
      2. Lower the heater core into the HVAC housing.
      3. Install the mode door actuator, if removed from housing for core removal.
      4. Position the retainers over the heater core tubes. Install and tighten the screws that secure the heater core and retainers to the HVAC housing. Tighten the screws to 2.2 Nm (20 in. lbs.) . NOTE: The grounding strap is to be attached to the lower heater core tube retainer.
      5. Reinstall the HVAC housing to the vehicle. See: Heating and Air Conditioning\Housing Assembly HVAC\Service and Repair

    1. Position the HVAC 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 the HVAC housing mounting nuts to the studs on the passenger compartment side of the dash panel. Tighten the nuts to 4.5 Nm (40 in. lbs.) .
    3. Connect the HVAC housing wire harness connectors.
    4. Reinstall the rear floor heat ducts to the center floor heat duct outlets.
    5. Install and tighten the nuts onto the HVAC housing mounting studs on the engine compartment side of the dash panel. Tighten the nuts to 7 Nm (60 in. lbs.) .
    6. Reinstall the PCM to the passenger side dash panel in the engine compartment. See: Powertrain Management\Computers and Control Systems\Engine Control Module\Service and Repair
    7. Reinstall the coolant reserve/overflow bottle to the passenger side inner fender shield. See: Engine, Cooling and Exhaust\Cooling System\Coolant Reservoir
    8. If the vehicle is equipped with the manual temperature control system, connect the HVAC system vacuum supply line connector to the tee fitting near the heater core tubes.
    9. Unclamp/unplug the heater core hoses and tubes. Connect the heater hoses to the heater core tubes and fill the engine cooling system. See: Engine, Cooling and Exhaust\Cooling System\Service and Repair
    10. Unplug or remove the tape from the suction line and the evaporator outlet tube fittings. Connect the suction line to the evaporator outlet tube. Tighten retaining nut to 28 Nm (250 in. lbs.) .
    11. Unplug or remove the tape from the liquid line and the evaporator inlet tube fittings. Connect the liquid line to the evaporator inlet tube. Tighten retaining nut to 28 Nm (250 in. lbs.) .
    12. Evacuate the refrigerant system. See: Refrigerant\Service and Repair
    13. Charge the refrigerant system. See: Refrigerant\Service and Repair
    14. 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\Procedures\Instrument Panel Assembly Replacement
    15. Connect the battery negative cable.
    16. Start the engine and check for proper operation of the heating and air conditioning systems.

Feb 07, 2009 | 2000 Jeep Grand Cherokee

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

1 Answer

Air conditioner not cooling


Is 1 of the 2 AC (under the hood) lines cold? if so you may have a blend door problem, that door is in the dash air duct distribution system, it mixes are between the hot heater core and the cold AC evaporater core to give the set or desired air outlet temp, When you turn the defrost on does it blow hot/cold as the lever is moved back and forth? The compressor turning off and on is normal cycling of the system, when it reaches a preset pressure in the low side line, a pressure switch will open and compressor will "cycle off" when the press starts to rise to a preset limit the compressor will "cycle on" and so on. I assume you have an electric bled door, older cars and trucks use a cable operated mechanical door.

Jul 25, 2008 | 1999 GMC Suburban

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