Where is the blower motor? how do i get to the blower motor for fan.

Check the AC fan relay
Symptoms Of A Defective Blower Motor Relay
The blower motor relay's job is to basically bypass the current that passes thru' blower motor resistor and deliver it directly to the blower motor. With the blower motor getting full battery current, it'll run in HI speed.

The most common symptom you'll see, when the blower motor relay fails in your Chevy S10 (GMC S15), is that the blower motor will not run in HI speed (but will run in LO, M1, and M2 speeds).

In some cases, the blower motor will fail and the blower motor will not run in HI but you'll have all of the other speeds working.

https://easyautodiagnostics.com/gm/2.8L/blower-motor-relay-multimeter-test-1

..

It's part of the blower motor resistor assembly . right below the blower motor under right side of dash

Do you have power going to the blower motor from the fan relay ?

Removal

1. Remove wiper arms.
2. Remove cowl panel.
3. Disconnect blower motor electrical connector and vent tube.
4. Remove blower motor retaining screws.

1. Remove fan retaining nut from blower shaft through plenum opening while holding the fan from the engine compartment.
2. Remove fan from blower motor while removing blower motor from vehicle.

Installation

1. Hold fan through plenum opening.
2. Install blower motor to vehicle while installing fan to blower motor.
3. Install fan retaining nut to blower motor shaft through plenum opening.
4. Install blower motor retaining screws.
5. Connect electrical connector and vent tube.
6. Install cowl panel.
7. Install wiper arms.

Hello,
You may want to try your fan on all speeds. If it will work on high, you have a bad resistor for the fan motor. ( high speed doesn't go through the resistor ).
If it doesn't work on any speed, I would check the following;
1. Make sure the fuse isn't blown for the fan blower motor.
2. Check, or have checked the wires between the fan control switch and the fan blower motor.
3. Have the fan control switch checked.
4. Have the fan blower motor checked.

I hope this helps you.

The blower motor can be tested by removing the lead to it and seeing if it has 12 Volts by observing if the 'test light' lights up when the dash controls indicate that the blower motor should be operational.

One can test the fuses by using a 'fuse tester' available from Walmart or an auto parts store which will light up when an energized circuit has a blown fuse.

The blower motor is located on the firewall on the passenger side, in general on GM cars from the 1990s.

You may have to remove some items to get to it, though.
Blower Motor REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.
2. If necessary, tag and disconnect the number 2, 4 and 6 spark plug wires from the ignition coil and move the coil out of the way.
3. For 1993-99 vehicles, remove the nuts and cross brace bar.
4. Detach the electrical connections from the blower motor.
5. Disconnect the cooling tube from the blower motor.
6. Unfasten the screws securing the blower motor to the blower module assembly.
7. Remove the blower motor and fan assembly from the module.
8. If necessary, unfasten the nut attaching the fan to the blower motor shaft, then pull the fan from the blower motor. Fig. 1: The blower motor and fan assembly is mounted in the heater and A/C module, and is accessible from the engine compartment
   Fig. 2: You can disassemble the fan from the motor by removing the retaining nut
   To install:
   
9. If the fan was removed from the motor, position the fan on the shaft, then install the retaining nut. Tighten the nut to 12 inch lbs. (1.4 Nm).
10. Position the blower motor and fan assembly to the module, then install the retaining screws. Tighten to 5 inch lbs. (0.6 Nm).
11. Connect the cooling tube to the blower motor.
12. Attach the electrical connector to the blower motor.
13. On 1993-98 vehicles, install the cross brace bar and retaining nuts. Tighten the nuts to 18 ft. lbs. (25 Nm).
14. If removed, install the coil and connect the spark plug wires, as tagged during removal.
15. Connect the negative battery cable.

This work for 1998 Buick Century 3.1L SFI OHV 6cyl; the blower motor is a variable speed motor. The higher the voltage applied to the motor, the faster the speed. Depending on the HVAC (Heater Ventilation Air Conditioning) option installed in the vehicle, blower speed control could be through a set of resistors or through a solid-state blower motor control module.

In general, this system is reliable. Because so many of the control operations are electronic, special diagnostic equipment really should be used for system diagnostics and check-out. An authorized technician using a scan tool can most quickly locate HVAC problems.

Fig. Typical behind-the-instrument panel view of HVAC related components. Depending on the HVAC option, not all components are used on all vehicles (click for zoom)

Fig. Typical HVAC operation schematic

An inoperative blower motor could be caused by the following:

* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.

REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.
2. The blower motor is located on the passenger side of the vehicle, under the instrument panel. Remove the right side sound insulator (trim panel) by removing the retainers and disconnecting the courtesy lamp.
3. Detach the blower motor electrical connector. Some applications may have cooling hose to the motor which should be disconnected.

Fig. Blower motor and fan assembly removal

1. Unfasten the blower motor mounting screws, then remove the blower motor from the vehicle.
2. If the blower motor fan (also called a 'squirrel cage') must be replaced, use the following procedure:

NOTE Do not hammer on the motor to remove or install the fan. Do not apply force to the motor housing to seat the fan on the motor, or motor/shaft bearing damage could result. Do not apply pressure to the fan rim. Be sure the correct replacement part is used.

1. Remove the metal star clip retaining the fan cage to the motor shaft.
2. Remove the fan by pulling straight out.
   

To install:

1. If removed, install the blower motor fan, as follows:
   1. Install the replacement fan cage onto the motor shaft.
   2. Adjust the fan cage to get a clearance of 0.30 inch (7.5mm) to the motor mount plate.
2. Install the remaining components in the reverse of the removal procedure. Make sure the electrical connection is secure. Tighten the motor screws to 14 ft. lbs. (20 Nm).
3. Connect the negative battery cable, then test the blower motor for proper operations

I hope this helps (remember to rate and comment this answer).

your circuit is simple--I will paste it below. suspect the blower has shorted and caused the switch to burn up. remove the blower and hotwire it to the battery to see if it works. If not, replace the blower. Then run continuity tests on the swoitch and replace switch if bad. If you have questions, please let me know. Here is procedure for taking blower out:

REMOVAL & INSTALLATION With Air Conditioning

1. Disconnect the negative battery cable.
2. Remove the glove compartment door and glove compartment by removing the retaining screws and bolts. Push the sides of the glove box in to free the drawer from dash panel.
3. Loosen the instrument panel at the lower right hand of the glove compartment opening. This is on it necessary if the panel is in the way of the motor housing.
4. Remove the retaining screws securing the ducting around the blower motor.
5. Remove the clip securing the blower motor fan blade to the motor arm. Remove the fan blade from the motor.
6. Remove the blower motor mounting plate from the evaporator case by unscrewing the retaining screws.
7. Rotate the motor until the mounting plate clears the edge of the glove compartment opening and remove the motor.
8. Remove the wire harness from the rear of the motor.
9. Inspect the fan blade for broken edges or cracks. Replace if needed.

To install:

1. Connect the wire harness to the rear of the blower motor.
2. Install the motor into the case and secure with the retaining screws.
3. Position and fasten the fan blade to the blower motor arm. Secure with the clip.
4. Secure the blower motor outer housing to the duct assembly with the retaining screws.
5. Install the instrument panel at the lower right hand side if removed earlier.
6. Install the glove compartment door and glove compartment.
7. Connect the negative battery cable.
8. Run blower motors to make the motor works correctly.
   

Without Air Conditioning

1. Disconnect the negative battery cable.
2. Remove the right ventilator assembly.
3. Remove the hub clamp spring from the blower wheel hub. Pull the blower wheel from the blower motor shaft.
4. Remove the blower motor flange attaching screws located inside the blower housing.
5. Pull the blower motor out from the blower housing (heater case) and disconnect the blower motor wires from the motor.

To install:

1. Connect the wires to the blower motor and position the motor in the blower housing.
2. Install the blower motor attaching screws.
3. Position the blower wheel on the motor shaft and install the hub clamp spring.
4. Install the air inlet duct assembly and the right ventilator assembly.
5. Connect negative battery cab
6. Check the system for proper operation.

Chk for power at the blower motor electrical connector. If no voltage, check the blower motor resistor, its within the blower motor vent (this controls power to the blower motor). Also, in theses vehicles water may have damaged the blower motor itself. Inspect the blower motor for proper function.

Fig. 1: The blower motor and fan assembly is mounted in the heater and A/C module, and is accessible from the engine compartment

GM Bonneville/Eighty Eight/LeSabre 1986-1999
Blower Motor - REMOVAL & INSTALLATION
(see Figures 1 and 2)

1. Disconnect the negative battery cable.
2. If necessary, tag and disconnect the number 2, 4 and 6 spark plug wires from the ignition coil and move the coil out of the way.
3. For 1993-99 vehicles, remove the nuts and cross brace bar.
4. Detach the electrical connections from the blower motor.
5. Disconnect the cooling tube from the blower motor.
6. Unfasten the screws securing the blower motor to the blower module assembly.
7. Remove the blower motor and fan assembly from the module.
8. If necessary, unfasten the nut attaching the fan to the blower motor shaft, then pull the fan from the blower motor.

Fig. 2: You can disassemble the fan from the motor by removing the retaining nut


To install:

1. If the fan was removed from the motor, position the fan on the shaft, then install the retaining nut. Tighten the nut to 12 inch lbs. (1.4 Nm).
2. Position the blower motor and fan assembly to the module, then install the retaining screws. Tighten to 5 inch lbs. (0.6 Nm).
3. Connect the cooling tube to the blower motor.
4. Attach the electrical connector to the blower motor.
5. On 1993-98 vehicles, install the cross brace bar and retaining nuts. Tighten the nuts to 18 ft. lbs. (25 Nm).
6. If removed, install the coil and connect the spark plug wires, as tagged during removal.
7. Connect the negative battery cable.

Hope this helped (remember rated and comment this).