Mechanics

ACDELCO 15-71923

1998 Pontiac Bonneville

Air Conditioning problem
1998 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic 175, 00 miles

Blower fan and outlets stopped gradually and at the same time. All fuses and relays seem to be OK. Think the problem is AC Delco 15-71923. Your opinion! I think it is behind glove box, but do not know if that is correct. I took out the glove box but there a lot of things in the way. Am I on the correct way?
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Jerrold
August 8, 2010.




Hi Jerrold,

Thank you for the donation.

The blower motor is located on center of engine compartment, below left maxi fuse block.

BLOWER MOTOR
Removal & Installation
Disconnect negative battery cable.
Remove strut tower cross brace.
Unplug blower motor electrical connector from blower motor.
Remove cooling tube.
Remove blower motor screws.
Remove blower motor and fan as an assembly.
To install, reverse removal procedure.
AD

KHLow2008
Aug 8, 2010.
The problem is not with the blower motor - wired directly it works fine. The problem is ACDelco 15-71923.
That being defective fits the symptoms fine. No blower and incorrect outlets as it was going bad. It is behind the glove box. Took the glove box out and still cannot get to the part. I can see several connections and relays but do not know what to take out next.

Tiny
Jerrold
Aug 8, 2010.
The blower control module is located on right side of firewall, near the blower motor.

If you are referring to the Heater and A/C Programmer, it is located on right side of dash near the glove box.

Here is a diagram of the connector terminals.


http://www.2carpros.com/forum/automotive_pictures/192750_ACHeaterProgrammer98BonvilleFig02_1.jpg



A/C-HEATER PROGRAMMER
Removal & Installation
1.Disable air bag system. Remove PCM from attaching bracket and leave hanging by harness connector. Disconnect vacuum and side electrical connector from A/C-heater programmer.

2.Reach up through PCM bracket and disconnect temperature valve link rod. Remove A/C-heater programmer attaching screws. Reach up through PCM bracket and disconnect temperature valve actuator connector. Remove A/C-heater programmer. See Fig. 1 .

3.To install, reverse removal procedure. Adjust air mix valve link. Activate air bag system.


http://www.2carpros.com/forum/automotive_pictures/192750_ACHeaterProgrammer98BonvilleFig01_1.jpg



KHLow2008
Aug 9, 2010.
Thanks for your input.

Does your reference to Heater A/C programmer also refer to the ACDelco 15-71923?

Do the symptoms I described - no control over what outlet the air comes from. And blower working slower and intermittently and both failing at the same time indicate that this is the defective part?

Jerry

Tiny
Jerrold
Aug 9, 2010.
Yes, the Heater A/C Programmer is the ACDelco and it does indicate this part is possibly faulty. It controls the blower operations and inside there is a solenoid that controls the mode door with vacumn from the engine, for air flow directions.

This is one of the test described in the repair manual.

BLOWER MOTOR DOES NOT RUN IN ANY MODE
1. Disconnect blower motor connector. Turn ignition switch to RUN position. Press defroster button. Adjust blower motor to high speed. Using voltmeter, measure voltage between blower motor harness connector terminal " A" (Purple wire) and ground. If less than battery voltage is present, go to step 3).

2. If battery voltage is present, measure voltage between blower motor harness connector terminals. If less than battery voltage is present, check for open in Black wire between blower motor and ground connector located at right front of engine compartment, near battery. Ensure ground connection is clean and tight. If battery voltage is present, check blower motor connector. If connector is okay, replace blower motor.
3. Check for open or short to ground in Purple wire etween blower motor control module and
first splice. Also check Purple wire between blower otor and relay center fuse No. 11 (10-amp). If Purple wire is not okay, repair circuitry as necessary. If Purple wires are okay, disconnect blower control module connectors. Using voltmeter, measure voltage between blower control module 2-pin connector terminal " B" (Red wire) and ground. If battery voltage is present, go to step 5).

4. If less than battery voltage is present, check fuse No. 3 (30-amp) in right underhood fuse block. If fuse is okay, check for open or short to ground in Red wire between fuse No. 3 and blower control module.

5. Using voltmeter, measure voltage between blower control module2-pin connector, terminal " B" (Red wire) and 4-pin connector, terminal " C" (Black wire). If less than battery voltage is present, check for open in Black wire. Ensure ground connector located at right front of engine compartment, near battery, is clean and tight. If battery voltage is present, measure voltage between blower control module 4-pin connector, terminal " B" (Gray/Black wire) and ground.

6. If voltage is less than 6 volts, go to next step. If voltage is 6-8 volts, check for loose connection at blower control module connectors. If connections are okay, replace blower control module.

7. Check Gray/Black wire for short to ground or open (including loose connection at A/C-heater programmer). If Gray/Black wire is okay, replace A/C-heater programmer.

KHLow2008
Aug 10, 2010.

AD