Water trapped in Evap case

N

Nomad

New member
Please forgive me, I am sure this has been asked alot. I have a 94 GC with water trapped in the evaporator case. The modification hole was done by the previous owner, repeated attempts to clean out with compressed air & wire/ hanger have produced little results. I have new black RTV sealant for the evap opening as this allowed water in as well. I would like to know if there are any options short of dash removal to properly clean out the debris? Is there any other remedy/ problem that would case this situation? Thank you in advance for your time
 

Other than the service bulletin, removing the instrument panel and HVAC housing would be my best answer to resolve the issue. Here's the service bulletin just in case you want to view it.
DATE: June 28, 1996

SYMPTOM/CONDITION:

Debris may collect in the evaporator drain tube area causing blockage of the tube. This can lead to water leaking from the heater housing, water sloshing around in the housing and odor from decayed organic debris. This bulletin provides instructions to gain easy access to the drain tube for clearing foreign matter from the tube, without removal of the heater A/C housing.
DIAGNOSIS:

Operate the system in the A/C mode and verify that water is draining from the system. The water drains into the frame rail and exits in the center of the vehicle. If no water is draining, the system is blocked and requires cleaning.
PARTS REQUIRED:

Quantity
Part No.
Description
1

5255217
Plug


REPAIR PROCEDURE:




This bulletin involves drilling a hole in the A/C evaporator housing to allow for cleaning of the drain tube.
  1. Pull the carpet down in the passengers foot well and locate the evaporator drain in the housing ( See Illustration).
  2. Drill a 1/4 inch hole in the center of the drain tube housing as shown. Clear the drain tube with a wire or suitable tool by inserting it through the hole and into the drain tube.
  3. Insert plug, P/N5255217 into the 1/4 inch hole drilled previously.
  4. Verify that the drain is clear by operating the system in the A/C mode and observing that water is draining.
 

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Does removal of blower help any? How could I find the steps to access the housing? (I am sure I could start taking things off until it fell out, but I am sure there is a more direct route.)
Thanks
 
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  1. Disconnect and isolate the battery negative cable.
  2. Remove the left and right switch pod bezels as described in this group.
  3. Remove the knee blocker as described in this group.
  4. Remove the two bolts securing the lower instrument panel reinforcement to the instrument panel armature and remove the reinforcement Instrument Panel Assembly Remove/Install
  5. Remove the upper and lower steering column shrouds. Refer to Steering for the procedures.
  6. Unplug all of the wiring connectors on the steering column-mounted components and switches.
  7. Remove the three nuts securing the steering column toe plate at the base of the steering column.
  8. Remove the two nuts securing the steering column mounting bracket to the studs on the steering column and brake pedal support and lower the steering column to the floor.
  9. Remove the right and left cowl side trim panels. Refer to Body Components for the procedures.
  10. Unplug the instrument panel to body wiring connector under the left end of the instrument panel.
  11. Unplug the brake lamp switch wiring connector.
  12. Unplug the instrument panel to heater-A/C housing vacuum connector (manual temperature control only) and wiring connector located under the right side of the instrument panel.
  13. Unplug the radio antenna coaxial cable connector near the right cowl side panel.
  14. Unplug all of the instrument panel wiring connectors from the junction block on the right cowl side panel.
  15. Disconnect the in-car temperature sensor aspirator hose at the coupling near the right side of the transmission floor tunnel, if so equipped.
  16. Remove the ash receiver and then remove the screw in the back of the ash receiver housing securing the instrument panel armature to the heater-A/C housing.
  17. Pull back the floor carpet on the transmission floor tunnel from the base of the instrument panel center bezel and remove the two bolts securing the instrument panel center bracket to the floor.
  18. Remove the two bolts securing the instrument panel center bracket to the left side of the transmission floor tunnel.
  19. Remove the bolt securing the instrument panel armature to the steering column and brake pedal support.
  20. Remove the two bolts securing the ends of the instrument panel armature to the cowl side panels.
  21. Remove the cowl top trim panel as described in this group.
  22. Remove the two bolts securing the ends of the instrument panel armature to the windshield fence.
  23. Remove the four nuts securing the top of the instrument panel armature to the studs on the windshield fence.
  24. With the aid of an assistant, lift the instrument panel off of the windshield fence studs and maneuver the assembly out of the passenger's side front door.
  25. Reverse the removal procedures to install. Tighten the mounting hardware as follows:
    • Instrument panel to windshield fence bolts and nuts - 5 N·m (45 in. lbs.)
    • Instrument panel to cowl side panel bolts - 12 N·m (105 in. lbs.)
    • Instrument panel to steering column support bolt - 12 N·m (105 in. lbs.)
    • Knee blocker mounting screws - 2.2 N·m (20 in. lbs.)
 
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