Rt2620 case the cooling fan is squealing so i want to get at it to clean or replace it.problem is i removed the 4 screws in the back but can't get the top of the case offi don't want to mess the case up on it .any idea's thanks

for replacing the fan you must open computer case unplug all power cords, remove 4 screws near the rear fan and pull out the power supply from the top interior. then you have at leat more 4 screws to remove the power supply cover out. then you will see the other 4 screws to remove the fan. if you just simply want to clean the fan open the computer case go to outside, take an air compressor and blow air into the fan and at the rear od the power supply on the air intake and you are done.

The good news is that you will get to open that case.The bad news is you will open the case to replace that fan.

Remove the power cord.Then open the case.Make sure you do NOT do this while standing on carpet or a rug.Before you touch anything make sure to touch some one or some thing to discharge static electricity.Now use a small screw driver and remove the 4 screws that hold the fan down.Now gently lift the fan out and put in the new one.Screw it down not to tight or it breaks the fan.Put the case together and you are done.

Heater Core - REMOVAL & INSTALLATION
1991-92 R/V and 1991-98 C/K Series

1. Disconnect the negative battery cable.
2. Drain the cooling system.
3. Remove the instrument panel glove compartment.
4. Tag and unplug all electrical leads as necessary.
5. Remove the center air distribution duct from the floor.
6. If necessary, remove the ECM and mounting tray.
7. Remove the hinge pillar trim panels.
8. Remove the blower motor cover and then remove the motor.
9. Remove the steering wheel and tilt back the instrument panel slightly.
10. Remove the coolant overflow tank. Disengage the heater hoses at the core connections.
11. Unfasten the attaching screws and nut and then remove the heater case.
12. Remove the seven screws and lift off the heater case cover.
13. Remove the fasteners and brackets that hold the heater core to the case and lift the core from the case.

To install:

1. Install the heater core in the case.
2. Install the heater case bottom plate. Make sure there is a good seal.
3. Install the heater case into the truck. Tighten the 4 lower screws to 17 inch lbs. (2 Nm); the upper screw to 97 inch lbs. (11 Nm); and the nuts to 25 inch lbs. (2.8 Nm).
4. Connect the heater hoses at the core tubes.
5. Install the coolant overflow tank.
6. Install the instrument panel and the steering wheel.
7. Install the blower motor and cover.
8. Install the trim panels and if removed, the ECM. Install the air distribution duct and reconnect all electrical leads.
9. Install the glove compartment. Fill the cooling system and connect the battery cable.

Blower Motor - REMOVAL & INSTALLATION
1992-98 Models
(see Figure 4)

1. Disconnect the negative battery cable.
2. Remove the right rear quarter panel trim.
3. Disconnect the electrical lead at the fan.
4. Remove the screws and if equipped, the cooling tube.
5. If necessary, remove the fan retaining nut and lift out the blower fan.
6. Remove the blower motor.
   

To install:

1. Install the blower motor and then position the fan.
2. Install the retaining nut and then tighten the mounting screws to 12 inch lbs. (2 Nm).
3. If removed, install the cooling tube.
4. Connect the electrical lead. Install the quarter panel trim cover.
5. Connect the battery cable.

Fig. 4: Auxiliary heating and A/C system

Hope this helps (remember to rate this answer).

Your fan is most likely in need of a cleaning, or straight out replacement. You can remove the retaining screws and pull the fan out as a complete unit and blow it out with a can of compressed air. If the noise is a high squealing sound, then I would purchase a replacement fan and install it. Fans can be purchased from Ebay, just remember to check and make sure that you are ordering the correct fan (case or heatsink) before you commit to buy.

you will have to remove all screws on the back then flip it over and remove key board then there will be more screws to remove LCD and palm rest. then remove screws from mother board and then you will be able to get to the fan.

The freezer is usually cooled by the compressor, the fridge is then cooled by an evaporator fan motor ($30). If this fan seizes or slows down then the fridge warms up (it sometimes starts squealing before this happens). It could be that your drain hose is clogged or frozen. Maybe the temperature adjuster go bumped.

If you think it is the evaporator fan motor:
Check to be sure you can get a replacement fan first, they last about 4 - 5 years. Can get from a parts supplier or electric motor company.
UNPLUG fridge. Located usually in top of freezer behind a vented cover plate. Remove cover, remove screws holding fan in, may have to cut wires. Replace with new motor, make sure the fan pushes air into the freezer area and doesn't spin backward drawing air from the freezer area.

You will need to open the case by removing the screws or thumbscrews on the back, should be anywhere from 1 to 4. Make sure you disconnect the power and discharge any static charge by pressing the power button after plug is disconnected. Once the screws are removed slide the case side panel off, or open like a **** depending on case design. Once opened you should be able to see the heatsink/fan assembly sitting on top of the cpu. You should not need to disassemble it to clean it. Just spray it out thoroughly with a can of compressed air. Once clean put the case back together and reconnect power. If the noise still persists then it could be that a bearing has burned out on the fan and it will need replaced. You can buy a fan fairly cheap to replace. Hope this helps you out.

there is a separate casing fan hidden out of sight and this is what is squealing.
take oven out, remove top and back panel and you can see the casing fan. try wd40

Make sure that nothing is obstructing the fan. Try to rotate the fan with your fingers to make sure it is free. If it is, you would be lucky if the fan is at fault because this is rather cheap and easy to find if not it is the main board which is at fault.