Air conditioner blower

BILLIEJEAN2018

MEMBER
1999 OLDSMOBILE 88
110,000 MILES

Air condition worked fine all day but later that evening I turned on the air and it was not blowing any air. I can hear air conditioner clutch engaging but air was out but the vents were cold to the touch. I turned the blower fan control knob to medium/high setting it started blowing out cold air. If I turn it up higher or any lower it will not blow any air. It only works at that setting medium/high. What is the problem?

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon.

It sounds like you have a failed blower resistor. That is what controls the different speeds.

Roy

1. Disconnect the negative battery cable.
2. Remove the fuse block cover.

ImageZoom/Print

3. Remove the center bolt from the multi use relay and fuse bracket.
4. Remove the positive booster cable.
5. Disconnect the underhood fuse blocks from the bracket.
6. Disconnect the relays from the bracket.
7. Remove the nuts which attach the multi-use relay and fuse bracket to the front of the dash.
8. Remove the fuse bracket.

ImageZoom/Print

9. Disconnect the connector (1) from the blower resistor assembly (3).
10. Remove the screws (2) which retain the blower resistor to the heater and A/C module (5).
11. Remove the blower resistor and gasket.

INSTALLATION PROCEDURE

imageZoom/Print

1. Install the blower resistor and gasket.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the screws (2) which retain the blower resistor to the heater and A/C module.

Tighten
Tighten the screws to 1.4 N.M (12 lb in).

3. Connect the wiring connector (1) to the blower resistor.

ImageZoom/Print

4. Install the nuts which attach the multi-use relay and fuse bracket to the front of the dash.

Tighten
Tighten the nuts to 3.8 N.M (34 lb in).

5. Move the fuse blocks and the relay into position. Snap the fuse blocks and the relay to the bracket.
6. Connect the positive booster cable to the multi-use relay and fuse bracket using the center bolt.

Tighten
Tighten the bolt to 10 N.M (89 lb in).

ImageZoom/Print

7. Install the fuse block cover.
8. Connect the negative battery cable.

Tighten
Tighten the negative battery cable to 15 N.M (11 lb ft).

Images (Click to make bigger)