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I need help replacing my temp thremosta. The cowling fan cover is in the way...this is the instructions I was given to remove the fan. ~ "I have found putting a 32mm wrench on it and hitting it with a mallet works good to break it free". The problem is the fan keeps spinning. I cant get the fan off.

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  • jcram1972 Jul 10, 2010

    I need help replacing my temp thremosta. The cowling fan cover is in the way... The problem is the fan keeps spinning. I cant get the fan off because it in the way.

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Yes, use an impact wrench powered by an air compressor. This is how to do it professionally, anyway.

You see, the clutch is designed to spin for safety reasons.

Good luck to you.

Posted on Jul 10, 2010

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  1. Drain the coolant. Refer to Draining and Filling Cooling System .
  2. Remove the instrument panel storage compartment.
  3. Disconnect the electrical connectors, as necessary.
  4. Remove the center floor air distribution duct.
  5. Remove the hinge pillar trim panels.
  6. Remove the blower motor cover.
  7. Remove the blower motor.
  8. Remove the steering column.
  9. Roll back the instrument panel. Refer to IP Carrier Replacement in Instrument Panel, Gauges and Console.
  10. Remove the coolant recovery reservoir.
  11. Remove the heater hoses.
  12. While holding the heater case to the cowl, remove the screw on the interior side of the cowl, near the evaporator pipe, if equipped.
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    2. On the engine side of the cowl, remove the 2 nuts that hold the heater case to the cowl.
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    4. Remove the 7 screws that hold the heater cover to the heater case.
    5. Remove the heater cover.
    6. Remove the heater core from the retainer.
    7. Installing
      1. Install the heater core into the retainer.
      2. Install the 7 screws that hold the heater cover to the heater case. Replace the seals.
      3. Install the heater cover. Verify that the heater cover is properly sealed.
      4. Install the heater case. If necessary, ask an assistant for help.
      5. On the engine side of the cowl, install the nuts that hold the heater case to the cowl.
      6. On the engine side of the cowl, install the 4 screws that hold the heater case to the cowl.
        1. On the interior side of the cowl, install the screw.
        NOTE : Refer to Fastener Notice in Cautions and Notices.

        1. Tighten the following fasteners:
        Tighten
        • Tighten the screws on the engine side of the cowl to 1.9 N.m (17 lb in) .
        • Tighten the two nuts to 2.8 N.m (25 lb in) .
        • Tighten the screw on the interior side of the cowl to 11 N.m (97 lb in) .
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        2. Install the coolant recovery reservoir.
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        4. Install the steering column.
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        6. Install the blower motor cover.
        7. Install the hinge pillar trim panels.
        8. Install the center floor air distribution duct.
        9. Connect the electrical connectors, as necessary.
        10. Install the instrument panel storage compartment.
        11. Add the engine coolant. Refer to Draining and Filling Cooling System
        12. Inspect the system for leaks.
        13. bonedivers_0.gifbonedivers_1.gifbonedivers_2.gifbonedivers_3.gif

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It could be that the condensation drain line is blocked and backing up into the car - but; it is more likely that your problem is a result of a poorly designed cowl cover over the blower fan for your air conditioner. this is a VERY common problem on 97-03 Grand Prix's as well as Malibu's and Impalas through '04. The other side effect of this is that water draining into the blower fan WILL cause it to fail eventually - this solution eliminates that risk.

Here is the cowl (pictures from an '04 Impala, FYI, but are identical):
d459ff7.jpg
You will need to remove it by pulling the retaining clips up - there is 1 on each end, and then one towards the top that has a slot in it. Be careful to not break these or lose them.

Remove the cowl, and underneath you will see the blower fan:

42f0c7e.jpg
Under the cowl you will see a rubber seal that is indicated by the arrow - this is the poorly designed "drip edge". You can either remove it - or leave it in place; the new diverter will accumulate any moisture captured by this seal and divert it properly.

Here is a picture of the part you need - which can be purchased from any GM dealership for about $4 - the GM part is #15794785. Most dealerships don't stock it - but they can order it for you.

1e4d9df.jpg
It simply sits in place as noted by the arrows - you'll notice there is a long extension from the left side of the part - this is the "finger gauge" - you want this to be positioned as far towards the left (as your facing the motor, or passenger side) of the vehicle as possible.
5cc4d0e.jpg
Here is a close-up of the gauge to give you perspective on how it should be positioned:

589f077.jpg
This is a shot of the drain area that the new diverter will use - instead of dumping water into the blower fan like the old design.

2ec9540.jpg
Now - for the cowl to fit over the new diverter - you will need to trim a couple of pieces of plastic from the bottom of the cowl - as indicated:

d051bff.jpg
You can simply use a utility knife and a pair of pliers to score and snap these pieces off.

b67ac22.jpg
65a56ed.jpg
What the underside of your cowl should look like after removing (lines indicate where plastic was removed)

19b73aa.jpg
No you can simply replace the cowl, and reinstall the retaining clips - and you are all done.

Hope this helps - be sure to rate it and comment! ;)

KC GTO Dad

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SECTION 303-03: Engine Cooling 2001 Lincoln LS Workshop Manual REMOVAL AND INSTALLATION Degas Bottle Removal and Installation
  1. Drain the engine cooling system. For additional information, refer to Cooling System Draining, Filling And Bleeding in this section.
  1. Remove the cowl vent screen. For additional information, refer to Section 501-02 .
Cowl Vent Screen Removal
NOTE: To remove the left side cowl vent screen, the right cowl vent screen must be removed first. Follow the entire cowl vent screen procedure.
Right Side Only
  1. NOTE: The fasteners are reuseable.
    Remove the right side of the cowl vent screen.
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    1. Pull up on the cowl vent screen to release the lower clips.
Entire Cowl Vent Screen
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    1. Remove the two pivot arm nut covers.
    1. Remove the two nuts.
    1. Remove the two wiper pivot arms.
  1. NOTE: Remove the right side first when removing the entire cowl vent screen.
    Remove the cowl vent screen.
    1. Remove the two-part pin-type retainers and separate the Velcro® attachment of the rubber hinge cover to the rear outboard corner of the cowl vent screen.
    1. Lift up on the cowl vent screen to release the clips.
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  1. Remove the seven bolts and reposition the cross vehicle support.
  1. Disconnect the degas return hose from the degas return tube.
  1. Remove the two bolts.
  1. Remove the degas bottle from the vehicle.

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