Question about Chevrolet Prizm

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How do i replace the evaporator core on my 1999 che prizm?

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  • Rod Crutchfield Aug 21, 2010

    please send the additional info, thanks

  • Rod Crutchfield Aug 21, 2010

    Great! you got me on my way! Do I need to take the dash off, and how do I do that if I need to? Thanks

  • Rod Crutchfield Aug 21, 2010

    all that tells me is how to remove the radio

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Hi,

This is quite tricky. Even Haynes manual have incorrect information regarding this particular model and year.

In order to remove the evaporator housing much or all of the dashboard needs to come out.There's a black plastic housing that seems to extend in one piece past the opening created by the glove compartment.

The manual reflects the correct procedure for earlier models (prior to an apparent design change). Yes, the procedure is considerably more involved with the later design as compared to the earlier one. Even for experienced technicians, challenges exist. In considering this undertaking, it's crucial to be absolutely sure of the diagnoses. We can send you additional information for doing the procedure yourself, but the information is intended for experienced technicians and may not provide the step-by-step information that you may require.

I would recommend this to be taken care by an experienced mechanic who have worked on this model and year.

Good Luck!!

Thanks!!

Posted on Aug 21, 2010

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  • taran_2005
    taran_2005 Aug 21, 2010

    Thanks for your response!!

    Before replacing the evaporator, check the drain hose for the evaporator case. This is a small rubber hose that comes through the fire wall and drains the condensation from the evaporator core. If you have a leak inside the evaporator case, it will show at this hose.

    There are other things inside the case besides the evaporator. There is an expansion valve and a joint where two tubes connect. These could be leaking and not the evaporator core.

    Changing the evaporator core or any of the components inside the evaporator case is a pretty big job. First, evacuate and recover the refrigerent. Take out the glove compartment and you will see most of what you need to take out. Take digital pictures, lots of them to help you get things back together. Disconnect the two large tubes to the evaporator. Then disconnect the cables, wires and unbolt the evaporator.


    Let me know,if needed further assistance.

    Good Luck!!

    Thanks!!

  • taran_2005
    taran_2005 Aug 21, 2010

    Thanks for your response!!

    Have a look at :-

    http://www.tune-town.com/Manuals/Metra/9...

    The above file would help you. You need to have acrobat reader to view the file.

    Good Luck!!

    Thanks!!

  • taran_2005
    taran_2005 Aug 21, 2010

    Thanks for your response!!

    You need to remove a part of dashboard console to remove the radio. I gave you the link to provide you an idea.

    Take a look at :-

    http://www.installdr.com/InstallDocs/Toy...

    You need to have acrobat reader to view the file.

    This is for COROLLA. However, the dashboard is somewhat similar to your model ( as far as i remember - i worked a long back on this model )......

    This would help you.You need to pry the dashboard console.

    I hope i have been helpful.

    Thank You!!

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The A/C evaporator core orifice has the following characteristics:
  • is color-coded orange
  • has a diameter of 1.46 mm (0.058 inch)
  • is located in the condenser to evaporator tube (19835)
  • has filter screens located on the inlet and outlet ends of the tube body
The A/C evaporator core orifice is the restriction in the refrigerant circuit that creates the pressure drop necessary for cooling by metering the flow of liquid refrigerant into the A/C evaporator core (19860), which reduces the pressure. Operation is as follows:
  • The inlet filter screen acts as a strainer for the liquid refrigerant flowing through the A/C evaporator core orifice.
  • O-rings on the A/C evaporator core orifice prevent the high-pressure liquid refrigerant from bypassing the A/C evaporator core orifice .
  • Adjustment or services cannot be made to the A/C evaporator core orifice assembly. It must be replaced as a unit.


A/C Evaporator Core Orifice

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Where exactly is the orifice tube located at on a 1996 (DOHC v6)?


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A/C Evaporator Core Orifice The A/C evaporator core orifice (19D990) should be replaced whenever the A/C compressor (19703) is replaced for lack of performance (internal damage). The A/C evaporator core orifice, located in the condenser to evaporator tube (19835), cannot be serviced in detail as a component of the line. If replacement is necessary, follow the procedure outlined for Liquid Line Removal and Installation. An orifice tube replacement service kit may be used as an optional service procedure. Refer to Section 12-00 for information regarding the use of an A/C Evaporator Core Orifice Replacement Kit E5VY-19D695-A.
-----------------------------------------------------------------------------------
A/C Evaporator Core Orifice Replacement Kit Installation
  1. Discharge A/C refrigerant system. Refer to System Discharging and Recovery as outlined.
  1. Remove condenser to evaporator tube (19835) from vehicle.
  1. Locate A/C evaporator core orifice (19D990) by three indentations or a circular recess in metal portion of the condenser to evaporator tube.


    A/C Evaporator Core Orifice Location
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  1. Note angular position of ends of condenser to evaporator tube so that it can be reassembled in correct position.
  1. Cut a 63.5 mm (2.5 inch) section from condenser to evaporator tube at A/C evaporator core orifice location. Do not cut closer than 25.4 mm (1 inch) from start of a bend in tube.


    A/C Evaporator Core Orifice Section Removed From the Liquid Line
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  1. Remove contaminants from the two pieces of the condenser to evaporator tube.
  1. NOTE: The inlet half of the condenser to evaporator tube will be positioned against the A/C evaporator core orifice tabs when correctly assembled.

    Lubricate fitting with clean refrigerant oil and assemble orifice tube kit (with A/C evaporator core orifice installed) to condenser to evaporator tube. Make sure flow direction arrow is pointing toward evaporator end of the condenser to evaporator tube, and taper of each compressor ring is toward compression nut.


    A/C Evaporator Core Orifice Kit Disassembled Components
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This is ''pops'' moore again!trying to save a $ You helped me before on the firing order.went to a/c guy.he tested system,said evaporator was bad and needed to be changed.his est.was my first born and a...


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-------------------------------
SECTION 412-03: Air Conditioning 1999 Town Car Workshop Manual
REMOVAL AND INSTALLATION Evaporator Core Removal and Installation
NOTE: The evaporator core is not separately serviceable. It is serviced only with the evaporator core housing assembly.
NOTE: Installing a new suction accumulator is not required when repairing the refrigerant system except when there is physical evidence of system contamination from a failed A/C compressor or damage to the suction accumulator.
NOTE: If an evaporator core leak is suspected, the evaporator core must be leak tested before it is removed from the vehicle. For additional information, refer to Section 412-00 .
  1. Remove the evaporator core housing. For additional information, refer to Section 412-02 .
  1. Transfer the components from the old evaporator core housing to the new evaporator core housing
  1. Install the evaporator core housing. For additional
  2. information, refer to Section 412-02
---------------------------------------------------------------------------
Evaporator Core Housing Removal
  1. Disconnect the battery ground cable (14301).
  1. Recover the refrigerant. For additional information, refer to Section 412-00 .
  1. Drain the radiator. For additional information, refer to Section 303-03 .
  1. Remove the screws and the RH cowl vent screen.
  1. Disconnect the vacuum hoses and the wire harness connector from the evaporative emission canister purge valve (EVAP canister purge valve) (9C915).
  1. Remove the nuts and remove the evaporative emission canister purge valve.
  1. Remove the heater hoses from the heater core.
  1. Remove the screw and reposition the windshield washer fluid reservoir.
  1. Disengage the four wire harness retainers from the top of the RH fender apron.
  1. Remove the RH front wheel and tire.
  1. Remove the screws from the RH fender apron and remove the fender apron.
  1. Disconnect the wire harness connector from the A/C cycling switch (19E561).
  1. Disconnect the wire harness connector from the blower motor (18527).
  1. Disengage the wire harness connector from the retainer.
  1. Disconnect the evaporator to compressor suction line from the suction accumulator/drier (19C836). For spring lock couplings disconnect and connect general procedure, refer to Section 412-00 .
  1. sxg~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: To prevent damage to the fitting and the tube, use a backup wrench when removing the suction accumulator/drier.
    Disconnect the suction accumulator/drier from the A/C evaporator core.
  1. Remove the clamp screw retaining the A/C accumulator mounting bracket to the A/C evaporator core housing and remove the suction accumulator/drier.
  1. Disconnect the condenser to evaporator tube from the A/C evaporator core (19860). For spring lock couplings disconnect and connect general procedure, refer to Section 412-00 .
  1. Remove the RH instrument panel insulator.
    • Remove the pushpins.
    • Disengage the courtesy lamp holder.
    • Disconnect the power point wire harness connector and remove the RH instrument panel insulator.
  1. Remove the in-car temperature sensor hose and elbow from the evaporator housing.
  1. Remove the nuts at the top of the evaporator housing.
  1. Remove the nuts at the bottom of the evaporator housing.
  1. Remove the screw and nut near the blower motor.
  1. Remove the screws.
  1. Separate the housing and remove the blower motor and A/C evaporator core.
  1. Disconnect the wire harness connector.
  1. Remove the evaporator core cover.

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