1998 SSE: blower motor non-functional at all settings - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 08-04-2004, 02:22 AM   #1
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Default 1998 SSE: blower motor non-functional at all settings

1998 SSE with 63K. Current problem is that the automatic climate control blower does not function at all. The A/C system is producing cold, but the blower is not delivering into the passenger cabin. The blower motor has been replaced with a known good unit (new) and tested with full battery voltage using jumper cables. The heater and A/C control unit in the dash ("On/Off, Temp, Auto/Man," etc.) has been replaced with a known good unit. Switching between settings engages and disengages compressor clutch satisfactorily. Next step is replacement of blower control module, unless anyone else has a better idea.....? Help?
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Old 08-04-2004, 10:37 AM   #2
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Default Re: 1998 SSE: blower motor non-functional at all settings

Quote:
Originally Posted by 1998SLE
1998 SSE with 63K. Current problem is that the automatic climate control blower does not function at all. The A/C system is producing cold, but the blower is not delivering into the passenger cabin. The blower motor has been replaced with a known good unit (new) and tested with full battery voltage using jumper cables. The heater and A/C control unit in the dash ("On/Off, Temp, Auto/Man," etc.) has been replaced with a known good unit. Switching between settings engages and disengages compressor clutch satisfactorily. Next step is replacement of blower control module, unless anyone else has a better idea.....? Help?
Try replacing the blower control relay first, then on to the module. The relay is only $12-$15 compared to around $150 for the module. Good luck.
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Old 08-04-2004, 10:46 AM   #3
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I don't think that there is a blower relay if there is a control module (ECC).

If you are nearby, I have one for my 93. We can compare part numbers to see if they are the same. I can send it to you for testing purposes.

I replaced it cause my blower motor wasn't working at all. After the replacement, it still didn't work so it'* the blower that'* the problem. I don't think it works on high though.
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Old 08-04-2004, 10:50 AM   #4
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Quote:
Originally Posted by randman1
I don't think that there is a blower relay if there is a control module (ECC).

If you are nearby, I have one for my 93. We can compare part numbers to see if they are the same. I can send it to you for testing purposes.

I replaced it cause my blower motor wasn't working at all. After the replacement, it still didn't work so it'* the blower that'* the problem. I don't think it works on high though.
The blower relay is in the relay box (mind you for a '93). I just replaced mine. The control module is a black box on the firewall. There is a difference. Here:

http://www.bonnevilleclub.com/forum/...control+module

relays, in order left to right:
A/C cut-out
Horn
High blower
Blower off

ABS pump
ABS main
High cooling fan
Low cooling fan
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Old 08-04-2004, 10:53 AM   #5
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Quote:
Originally Posted by randman1
I don't think that there is a blower relay if there is a control module (ECC).

If you are nearby, I have one for my 93. We can compare part numbers to see if they are the same. I can send it to you for testing purposes.

I replaced it cause my blower motor wasn't working at all. After the replacement, it still didn't work so it'* the blower that'* the problem. I don't think it works on high though.
P.*. If the '93 module doesn't work for the '98, I sure could use it!!!!!!
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Old 08-04-2004, 12:01 PM   #6
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Quote:
Originally Posted by TrueWildMan
P.*. If the '93 module doesn't work for the '98, I sure could use it!!!!!!
No problem. If 1998 SLE dosen't need it, it'* yours. Again, I don't think it works on high. The test light was a little dimmer than I expected it to be when it was tested (too lazy to get the multimeter out).

BTW, I must have an inferior diagram for the '93 cause I'm still not seeing a relay for the blower motor with an ECC equipped car. If I recall correctly, there are two vacant relay locations right where you indicated the blower relays are. I'd have to take a peek tonight to be sure.

Sorry to get off of the author'* original post.
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Old 08-04-2004, 12:20 PM   #7
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Quote:
Originally Posted by randman1
Quote:
Originally Posted by TrueWildMan
P.*. If the '93 module doesn't work for the '98, I sure could use it!!!!!!
No problem. If 1998 SLE dosen't need it, it'* yours. Again, I don't think it works on high. The test light was a little dimmer than I expected it to be when it was tested (too lazy to get the multimeter out).

BTW, I must have an inferior diagram for the '93 cause I'm still not seeing a relay for the blower motor with an ECC equipped car. If I recall correctly, there are two vacant relay locations right where you indicated the blower relays are. I'd have to take a peek tonight to be sure.

Sorry to get off of the author'* original post.
Well, being an SSEi, I'm pretty sure I have the module, and the relays are there. The module controls fan speed, the relay supplies the regulated power...right?
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Old 08-04-2004, 12:40 PM   #8
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Automatic Climate Controls
DESCRIPTION

Blower motor speed is controlled by the solid state blower control module, which follows commands from the Heating Ventilation and Air Conditioning (HVAC) programmer. The HVAC programmer, in turn, determines the proper blower speed using information from the heater and A/C control assembly and its network of sensors.

OPERATION

The HVAC programmer'* blower speed command to the blower control module is a continuously varying voltage (between about 2 and 8 volts). With a voltage signal of about 2 volts from the HVAC programmer, the blower control module outputs about 4 volts to run the blower motor at its slowest speed. With a voltage signal of -about 8 volts from the programmer, the blower control module outputs battery voltage to run the blower motor at maximum speed.

The blower can be operated in either manual fan mode or AUTO fan mode. In manual fan mode, five different fan speeds are available and, once selected, fan speed remains constant until a new speed is selected from the heater and A/C control assembly.

In AUTO fan mode, blower speed is infinitely variable (between the minimum and maximum speeds and varies automatically according to conditions monitored by the HVAC programmer'* network of sensors. Sensors that provide information that may affect blower speed in AUTO mode include: the in-vehicle temperature sensor, ambient temperature sensor, solar sensor and vehicle speed sensor


Manual Climate Controls
DESCRIPTION

The Blower Motor speed is controlled by the Blower Switch in the heater and A/C Control Assembly.

OPERATION

With the switch in LO, all of the Blower Resistors are in the circuit with the Motor so that it runs slowly. In the M1 and M2 positions, the Blower Switch bypasses some of the resistors increasing the motor speed.

The Blower Motor is fed through the contact of the Blower Relay. When the Blower Switch is in HI, battery voltage is supplied through the ORN (52) wire to the coil of the Blower Relay. The relay is energized and its contacts supply battery voltage directly to the Blower Motor from RH Underhood Fuse Block Fuse 3. The Blower Motor runs at maximum speed.

When the Mode Selector is in OFF, no voltage is applied to the Blower Switch and Motor so the blower does not run. In all others positions, the blower operates as described.




This is what I'm reading. No relay with ECC, relay for HI fan speed only with manual.

There is an AC clutch relay in either case though but it has no effect on blower speed.
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Old 08-04-2004, 09:02 PM   #9
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I'm not aware of any relays with the electronic system.....

You need to test voltage at the fan harness with the fan controls at different settings. I would expect low voltage there. You also should test the voltage at the blower control module, too. You need to see what voltage the programmer is putting out.

http://www.bonnevilleclub.com/forum/...ic.php?t=11568
http://www.bonnevilleclub.com/forum/...pic.php?t=5920

Tell us what you find. I am betting that the blower control module is bad... I've never heard of problems with the head unit...
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Old 08-08-2004, 12:44 AM   #10
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Default 1998 SSE: blower motor non-functional at all settings

After ~$110.00 cost for the replacement blower control module and $40.00 for the blower (although the blower really did not need replacement), the blower IS working again. Thanks to all who volunteered parts and advice!!!!

However, there is another question on this topic: the A/C blows only through the defrost ducts and the floor ducts for the first thirty or so minutes despite selecting another vent setting using the dash controls. Since this is the first automatic climate control car we've had, is this "normal" operation? The owner'* manual sheds ZERO information regarding proper use of the option and the factory shop manual is not much better. Is this a malfunction of the air blending ducts or servos in the dash or is this how the unit is supposed to operate?

As always, any help is appreciated. Once again, thanks to all who contributed.
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