MY AIR CONDITIONING HAS A LEAK POSSIBLY EVAPORATOR

They use a leak testing spray, so yes it is possible. The evaporator element are behind there. It is the same as the one in the back of your freezer. You could ask them to try a leak sealant and add gas.

Check the purge solenoid under the hood common problem in mazda 5 6 cx7.

the advice is correct up to a point in that the seal in the compressor needs to be working or it dries out and leaks out the gas
AS for the rest no
evaporator leaks , line leaks or condenser leaks occur from metal fatigue or corrosion
Internal corrosion is from moisture in the system from the system not being properly vacuumed to allow the moisture to boil off before the gas is added
corrosion externally of the evaporator is normally from the gunk build up and water forming on the fins of the evaporator
Possibly your problem or loose fitting nut/s
To add further , all cars running a climate control system have the ac compressor running all of the time and when it gets too cold , the module opens up the heater core to take the edge of the cold air
running an ac all of the time reduces the fog on a windscreen and the heater can be used manually to warm the interior

Could be the evaporator, rare but possible. Double check the schrader valves on the high and low pressure lines, and the shut off valves on the lines going to and from the condensor, and the condensor itself. (common culprit) Also the front seal on the compressor if leaking will have oily residue all over. No offense but try a different mechanic. Sometimes a new set of eyes works wonders!! Your mechanic won't be offended. If he is, fire him.

1. Air conditioner evaporator drain hose is blocked. Clear the drain hose where it exits the passenger compartment.
2. Air conditioner evaporator drain hose is disconnected. Secure the drain hose to the evaporator drainage tray under the dashboard.

Which code specifically? Do not assume you need a new solenoid. Our recommendation will depend on the specific code and some troubleshooting results. I usually recommend checking over all the EVAP vacuum lines and the gas cap too whenever there is a purge valve code. Check the vacuum lines at the cannister in the left rear bumper. I will paste info on the purge solenoid below.

P0440 Evaporative emission (EVAP) system - malfunction

Possible causes: Hose connection(s), intake leak, EVAP canister purge valve

P0441 Evaporative emission (EVAP) system - incorrect flow detected

Possible causes: Hose connection(s), intake leak, EVAP canister purge valve

P0442 Evaporative emission (EVAP) system - small leak detected

Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve

P0443 Evaporative emission (EVAP) canister purge valve - circuit malfunction

Possible causes: Wiring, EVAP canister purge valve, ECM

P0444 Evaporative emission (EVAP) canister purge valve -open circuit

Possible causes: Wiring open circuit, EVAP canister purge valve, ECM

P0445 Evaporative emission (EVAP) canister purge valve -short circuit

Possible causes: Wiring short circuit, EVAP canister purge valve, ECM

P0450 Evaporative emission (EVAP) pressure sensor - circuit malfunction

Possible causes: Wiring, EVAP pressure sensor, ECM

P0455 Evaporative emission (EVAP) system - large leak detected

Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve

P0456 Evaporative emission system - very small leak detected

Possible causes: Mechanical fault, hose connection(s), EVAP pressure "sensor

P0457 Evaporative emission system - leak detected (fuel cap loose/off)

Possible causes: Mechanical fault, hose connection(s), EVAP pressure sensor

P0458 Evaporative emission system, purge control valve -circuit low

Possible causes: Wiring short to earth, EVAP valve

P0459 Evaporative emission system, purge control valve -circuit high
Possible causes: Wiring short to positive, EVAP valve

Evaporative Emission Purge Solenoid

Description & Operation
The duty cycle EVAP canister purge solenoid (DCP) regulates the rate of vapor flow from the EVAP canister to the intake manifold. The Powertrain Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The PCM de-energizes the solenoid during open loop operation.
The engine enters closed loop operation after it reaches a specified temperature and the time delay ends. During closed loop operation, the PCM cycles (energizes and de-energizes) the solenoid 5 or 10 times per second, depending upon operating conditions. The PCM varies the vapor flow rate by changing solenoid pulse width. Pulse width is the amount of time that the solenoid is energized. The PCM adjusts solenoid pulse width based on engine operating condition.
Removal & Installation
The duty cycle evaporative (EVAP) canister purge solenoid is located in the engine compartment near the brake master cylinder.

1. Disconnect electrical connector at solenoid.
2. Disconnect vacuum lines at solenoid.
3. Lift solenoid slot from mounting bracket for Removal & Installation.

To Install:

1. Position solenoid slot to mounting bracket.
2. Connect vacuum lines to solenoid. Be sure vacuum lines are firmly connected and not leaking or damaged. If leaking, a Diagnostic Trouble Code (DTC) may be set with certain emission packages.
3. Connect electrical connector to solenoid.
   

Purge solenoid location:


EVAP cannister location:

Compressor usually leaks freon on the Cavalier. Hard to see the leak. But that is usually the culpret.

If you have had it checked out and there telling you this, then you have a leaking evaporator and they will have to go up in the dash to replace it, if you have not had it checked, they need to install dry and check it for leaks, it could be any thing from a/c compr, hoses, condensor or evaporator or hoes connector's.

1. Disconnect the negative (-) battery cable.
2. Drain the engine coolant into a suitable container.

CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

1. Disconnect the heater hoses. Be careful not to damage the core by pulling on the hose to remove. Cut the hoses if they will not come off easily.
2. Remove the instrument panel.
3. Disconnect the resistor assembly.
4. If possible, disconnect and move the duct (non air conditioning) or the evaporator housing (air conditioning) to the right to gain clearance for the heater unit. If equipped with air conditioning, do not disconnect air conditioning system until absolutely necessary. Refer to for discharging, evacuating and recharging the system.
5. Remove the instrument panel stay and heater unit.
6. Disassemble the heater unit by removing the duct, mode control case, core assembly and heater core.

To install:

1. Assemble the heater unit by installing the duct, mode control case, core assembly and heater core.
2. Install the heater unit and instrument panel stay.
3. Connect the duct (non air conditioning) or the evaporator housing (air conditioning) to the heater unit. Evacuate and recharge the air conditioning system if the system was discharged to remove the evaporator assembly.
4. Connect the resistor assembly.
5. Install the instrument panel as outlined in this section.
6. Connect the heater hoses. Be careful not to damage the core by pulling on the hose.
7. Refill the engine coolant into a suitable container.
8. Connect the negative (-) battery cable and check for leaks.

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.