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Car Forum / Oldsmobile Cars / March 20062000 heater blower motor, no high speed
2000 Alero...About two months ago, I replaced the circuit board that controls the low speeds on the blower motor and things were good. Then, the 30A fuse blew and now the highest fan setting doesn't work. Is there another relay or something that supplies direct voltage that can go bad? TIA! Darryl. Yes, the blower motor relay energizes to apply the full battery voltage to the blower motor. When it's deenergized power comes through that circuit board (resistor board) you replaced then to the normally closed contact in the relay and on to the motor. Did you find the cause of the 30 amp fuse's blowing? If your blower motor is still working in the lower speeds then a wiring fault would be my suspect. > 2000 Alero...About two months ago, I replaced the circuit board that > controls the low speeds on the blower motor and things were good. [quoted text clipped - 5 lines] > TIA! > Darryl. Thanks for the reply but I'm feeling dense at the moment so I could use a little clarification. Does all voltage flow through the relay and then either to the resistor board for slower speeds or directly to the motor for full speed? I haven't looked further into the 30A fuse. I had made the mistake of leaving the fan in the on position the night before. Perhaps the fuse blew at ignition... >Yes, the blower motor relay energizes to apply the full battery voltage to >the blower motor. When it's deenergized power comes through that circuit [quoted text clipped - 14 lines] >> TIA! >> Darryl. Power for the blower's first four speeds comes from the 20 amp HVAC BLOWER fuse in the right hand instrument panel fuse block; first through the speed selector switch then the resistor assembly then to the normally closed contact (closed when relay is deenergized) in the relay and finally to the motor. The relay is not energized at this time. When it's placed in the high speed position the speed selector switch energizes the blower motor relay . This applies power from the 30 amp HI BLO MOT fuse through the relay's normally open contact (closed with relay energized) and directly to the blower motor. This fuse is in the underhood junction block. > Thanks for the reply but I'm feeling dense at the moment so I could > use a little clarification. Does all voltage flow through the relay [quoted text clipped - 23 lines] >>> TIA! >>> Darryl. I hate to butt in but i have a situation that is very similar on my 2000 intrigue. I have 2 problems actually. First, my lower fan speeds started going out from the lower speeds up. I believe i have to replace the resistor assembly for that, but i am unsure of where that is located and was wondering if you could tell me where to find it. The second thing that happened yesterday was the heater fan started running by itself on high, key off, and with the fan switch turned off. The only way to get it to stop was to pull the 30 amp HI BLOWER fuse. I suspect the HI blower relay but am unsure as of why it continues to run with the ignition off. Is the relay connected directly to continuous power and the ignition switch only turns off the power to energize the relay? If this relay is stuck will it run regardless of ignition switch position? If so where could i find this relay? I did not see it listed as one of the relays in the underhood fuse/relay center. Thanks for any help. Erick > Power for the blower's first four speeds comes from the 20 amp HVAC BLOWER > fuse in the right hand instrument panel fuse block; first through the [quoted text clipped - 38 lines] >>>> TIA! >>>> Darryl. The high blower speed relay gets power from a source that is always hot even if the ignition key is turned off. The relay (described in the manual as a mini-relay is in the underhood fuse block, immediately to the left of the 30 amp fuse for the blower. You could try swapping it with one of its neighbors to determine if it has failed. My advice would be to check/replace the relay first and then move on to the resistor assembly if low speeds are still absent. Procedure below: Document ID# 579708 2000 Oldsmobile Alero -------------------------------------------------------------------------------- Blower Motor Resistor Replacement Removal Procedure The blower motor resistor is located in the lower right hand corner of the HVAC module. This resistor is located between the blower motor and the front of the dash. Remove the right side instrument panel (IP) insulator. Refer to Closeout/Insulator Panel Replacement - Right in Instrument Panel, Gauges, and Console. Disconnect the blower resistor electrical connector. Remove the blower resistor screws. Remove the blower motor resistor. Installation Procedure Install the blower resistor. Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems. Install the blower resistor screws. Tighten Tighten the screws to 1 N·m (9 lb in). Connect the blower resistor electrical connector. Install the right side instrument panel (IP) insulator. Refer to Closeout/Insulator Panel Replacement - Right in Instrument Panel, Gauges, and Console. >I hate to butt in but i have a situation that is very similar on my 2000 >intrigue. I have 2 problems actually. First, my lower fan speeds started [quoted text clipped - 57 lines] >>>>> TIA! >>>>> Darryl. Thanks Silver Surfer. Erick: One of the screws retaining the resistor pack is very close to the firewall. It might help if you have an assisstant with small hands. I eventually removed and replaced it but had to use a pair of needle nose pliers. Good luck! >The high blower speed relay gets power from a source that is always hot even >if the ignition key is turned off. [quoted text clipped - 106 lines] >>>>>> TIA! >>>>>> Darryl. Same problem with a 99 GLS, started with no low speed then progressed to no higher speeds, finally only had the highest which eventually blew the 30 amp fuse. I knew it was the resistor which Advance Auto Parts had for $19.88. Without these messages I think I would be still searching for the location, on the firewall side, forward of the blower. Used 7/32 socket and the needlenose pliers for the bolt against the firewall. Removing the original I found it partially broken and clearly burnt. There was also some moisture in the socket that likely got there after the resistor got hot and the seal failed. Thanks for the help. BAM > Thanks Silver Surfer. > [quoted text clipped - 115 lines] > >>>>>> TIA! > >>>>>> Darryl. |
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