1994 Buick Lesabre totally clueless

Tiny
BIGDADDY51
  • MEMBER
  • 1994 BUICK LESABRE
Electrical problem
1994 Buick Lesabre 6 cyl Front Wheel Drive 132000 miles

When I manualy adjust the airflow into the cabin with the switch only the first three speeds work. When I attempt high or the 4th speed, evrything goes silent. In short, the high speed does not work. Somebody please help.
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Monday, July 20th, 2009 AT 3:46 PM

12 Replies

Tiny
MERLIN2021
  • EXPERT
Check the blower motor relay on the right side of the firewall.
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Monday, July 20th, 2009 AT 3:53 PM
Tiny
BIGDADDY51
  • MEMBER
If I stand facing the car front. Where is the blower motor relay? Also, Where is the blower motor resistor located? As stated originally, for some reason I only get three of four a/c speeds. Once again guys, I am totally clueless
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Tuesday, July 21st, 2009 AT 3:27 PM
Tiny
MERLIN2021
  • EXPERT
BLOWER RELAY TEST LeSabre & Park Avenue 1. Turn ignition switch to RUN position. Remove blower speed relay. Set A/C-heater mode selector switch to NORM position. Set blower switch to HIGH position. Measure voltage between blower speed relay connector terminal No. 86 (Black wire) and ground. See Fig. 14 . If battery voltage is present, go to next step. If battery voltage is not present, check Black wire for open or short to ground and check fuse 5D in instrument panel fuse block. 2. Measure voltage between blower speed relay connector terminals No. 30 (Purple wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, check Purple wire for an open. 3. Measure voltage between blower speed relay connector terminals No. 85 (Orange wire) and No. 86 (Black wire) of blower speed relay connector. If voltmeter reads battery voltage, go to next step. If volt-meter does not read battery voltage, check Orange and Black wires for an open or short to ground. Check A/C-heater control panel connector terminal "H" and in-line connector for proper terminal contact. If wiring and connections are good, perform A/C- HEATER CONTROL PANEL TEST. 4. Connect a fused jumper wire (25-amp fuse) between blower speed relay connector terminals No. 30 (Purple wire) and No. 87 (Red wire). If blower runs at high speed, perform BLOWER HIGH SPEED RELAY TEST. If blower does not run, check A/C-heater control panel wiring for opens or shorts.BLOWER HIGH SPEED RELAY TEST LeSabre & Park Avenue 1. Turn ignition switch to RUN position. Remove blower high speed relay. Set A/C-heater mode selector switch to HEATER position. Measure voltage between blower speed relay connector terminal No. 87A (Dark Blue wire) and ground. See Fig. 14 . If battery voltage is present, go to next step. If battery voltage is not present, check Dark Blue wire for open or short to ground. Check blower resistor terminal for proper contact. If wire and terminals are okay, perform BLOWER MOTOR RESISTOR TEST. 2. Connect a fused jumper wire between blower speed relay connector terminals No. 30 (Purple wire) and No. 87A (Dark Blue wire). If blower operates, replace high speed blower relay. If blower does not operate, turn ignition switch off, reinstall blower relay and go to next step. 3. Turn ignition switch to RUN position. Disconnect blower motor connector. Measure voltage between blower motor connector terminals. If battery voltage is present, check blower motor connector terminals for proper contact. If contact is good, replace blower motor. If battery voltage is not present, check for an open or short to ground in high speed blower relay wiring. 4. Turn ignition switch to RUN position. Remove blower high speed relay. Set A/C-heater mode selector switch to NORM position. Place blower switch in HIGH position. Measure voltage between blower speed relay connector terminal No. 86 (Black wire) and ground. See Fig. 14 . If battery voltage is present, go to next step. If battery voltage is not present, check Black wire for open. Check in-line connector for proper terminal contact. Check A/C-heater control panel connector terminal "B" for proper contact. If wiring and connections are okay, replace A/C- heater control panel. 5. Measure voltage between blower speed relay connector terminals No. 86 (Black wire) and No. 85 (Orange wire). If battery voltage is present, go to next step. If battery voltage is not present, check Black and Orange wires for an open. Repair as necessary. 6. Connect a fused jumper wire between blower speed relay connector terminals No. 30 (Purple wire) and No. 87 (Red wire). If blower operates, replace high speed blower relay. If blower does not operate, check underhood fuse block fuse No. 3. Check Red wire for an open or short to ground. If wiring and fuse is okay, replace high speed blower relay. BLOWER SWITCH TEST 1. Unplug blower motor resistor connector. Turn ignition switch to RUN position. Set A/C mode selector to VENT position. Set blower switch to medium low position. 2. Measure voltage between blower motor resistor connector Tan wire and ground. If battery voltage is present, go to next step. If voltage is not present, check Tan wire for open. If Tan wire is okay, replace blower switch. 3. Set blower switch to medium high position. Measure voltage between blower motor resistor connector Light Blue wire and ground. If voltage is present, go to next step. If voltage is not present, check Light Blue wire for open. If Light Blue wire is okay, replace blower switch. 4. Set blower switch to HIGH position. Measure voltage between blower high speed relay connector Orange wire and ground. If battery voltage is present, blower switch is okay. If battery voltage is not present, check Orange wire for an open. If Orange wire is okay, replace blower switch.BLOWER MOTOR RESISTOR TEST 1. Turn ignition off. Unplug blower motor resistor connector, located in rear center engine compartment. Using voltmeter, measure voltage at blower resistor connector terminal "D" (Light Blue wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, check for open in Light Blue wire. 2. Place blower switch in medium low position. Measure voltage at blower resistor connector terminal "C" (Tan wire). If battery voltage is present, go to next step. If battery voltage is not present, check for open in Tan wire. Check in-line connector for proper contact. Check A/C- heater control panel connector terminal "C" for proper contact. If wiring and contacts are good, replace A/C-heater control panel. 3. Place blower switch in medium high position. Measure voltage at blower resistor connector terminal "B" (Light Blue wire). If battery voltage is present, check blower resistor terminals for proper contact. If contact is okay, replace blower resistor. If battery voltage is not present, check for open in Light Blue wire. Check in-line connector for proper contact. Check A/C- heater control panel connector terminal "D" for proper contact. If wiring and contacts are good, replace A/C-heater control panel.


http://www.2carpros.com/forum/automotive_pictures/62217_lesabrea_3.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_lesabreb_1.jpg


Relay is behind the engine, number N2, first one on the left.
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Tuesday, July 21st, 2009 AT 3:44 PM
Tiny
BIGDADDY51
  • MEMBER
Where is the blower resistor located? At this point I am moving on in posibilities. Testing proved the relay is fine. I understand the resistor test directions. But need to know resistor's location?

Thanxs
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Tuesday, July 21st, 2009 AT 7:35 PM
Tiny
MERLIN2021
  • EXPERT
As noted in the post above, it's located in the rear of the engine compartment. These instructions also tell you the locations of the parts.
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Wednesday, July 22nd, 2009 AT 2:53 AM
Tiny
BIGDADDY51
  • MEMBER
Reading the diagram you sent(by the way, thankyou) which alphabet is the blower resistor connector. The instructions say the blower resistor connector is in the center rear of the engine compartment. So, again, which alphabet is the resistor for the blower motor so I can test the resistor?
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Wednesday, July 22nd, 2009 AT 5:42 AM
Tiny
BIGDADDY51
  • MEMBER
The blower resistor is alphabet? What of the diagram?
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Wednesday, July 22nd, 2009 AT 5:45 AM
Tiny
BIGDADDY51
  • MEMBER
Thanks for the great info on testing the relay and resistor. However, I still can't seem to figure out where the blower motor resistor is located. If you could just say "the blower motor resistor is "A" "B" or "C" on this diagram, it sure would help a lot. You guys are doing a great job. I will be donating again this weekend. Keep up the good work.
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Wednesday, July 22nd, 2009 AT 8:19 AM
Tiny
BIGDADDY51
  • MEMBER
Ok, so it's me, I confess, I am a dummy. Now would someone please tell me WHERE THE BLOWER MOTOR RESISTOR IS LOCATED. Contrary to what Merlin2021 says, the instructions tell only where the resistor connector is located. Not the resistor. If it's in the instructions, tell me which line and I will go there. I am not fond of worrying you guys with this resistor question repeatedly, but it has not been answered, as I cannot locate it. WHERE IS THE LOCATION OF THE BLOWER MOTOR RESISTOR IN A 1994 BUICK LASABRE?
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Wednesday, July 22nd, 2009 AT 1:59 PM
Tiny
BUDDYCRAIGG
  • EXPERT
Hello,
the blower motor resistor should be right where the connector is indicated in the picture.

Normally close to the blower, because air from the blower keeps the resistors from over heating.
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Wednesday, July 22nd, 2009 AT 2:17 PM
Tiny
BIGDADDY51
  • MEMBER
Thank you buddycraigg, it sounds like the resistor on my car is under the dash INSIDE THE CAR. You did what I needed, a simple answer. The best part about your answer is that now I will be able to find it, because now I know it will be near the blower.
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Wednesday, July 22nd, 2009 AT 2:25 PM
Tiny
JDIXON30
  • MEMBER
Hello. I have a 1994 Buick Park Avenue Ultra and the climate control module isn't working. Nothing is showing up on the display the screen is just black. I know power is getting to it because when you press the auto, heat, ac, or any button it peeps. Even at night when the headlights are on the buttons on are lite up but when you go to press a button to turn it on there is nothing. No heat no ac the display screen is blacked out. I've purchased another climate control module and it's doing the same thing. I checked the fuses under the driver side dashboard and under the hood and they are good. It's cold outside and I really need this repaired. I hope you can advise me with great. Thanks!
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Wednesday, January 13th, 2016 AT 6:39 AM

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