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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / November 2006Lowest 2 blower settings not working
Car: 2000 Pontiac G.A. 3.4 Just noticed the other day that the 2 lowest blower settings don't work. Noting comes out of the vents as though it's off. When I move the fan setting to "3" it suddenly comes out at the regular 3 speed, which is too high for most situations. What could be wrong? Does the actual switch need to be replaced? Thanks MB The blower motor resister is bad or the harness connector the plugs onto it isn't making a good connection.  SignatureJustSayGo http://www.automotiveforums.com Wouldn't that blower dial be like a potentiameter with discrete settings? Couldn't it have gone bad, or is that not the way it works? Thanks MB > The blower motor resister is bad or the harness connector the plugs onto > it isn't making a good connection. [quoted text clipped - 6 lines] > > http://www.automotiveforums.com No, the switch is just a switch, they have a pack of resistors that adjust the current to the fan motor. When all you get it high, you have a full 12v to the motor- a direct path, the resistors have burned-- out hence forth no low speeds. The resistors are usually in the heater ducting around the passengers feet or sometimes in the engine bay area passenger side. SignatureStephen W. Hansen ASE Certified Master Automobile Technician ASE Automobile Advanced Engine Performance ASE Undercar Specialist http://autorepair.about.com/cs/troubleshooting/l/bl_obd_main.htm http://www.troublecodes.net/technical/ http://www.familycar.com/Alignment.htm > Wouldn't that blower dial be like a potentiameter with discrete > settings? Couldn't it have gone bad, or is that not the way it works? [quoted text clipped - 14 lines] >> >> http://www.automotiveforums.com > No, the switch is just a switch, they have a pack of resistors that adjust > the current to the fan motor. When all you get it high, you have a full 12v > to the motor- a direct path, the resistors have burned-- out hence forth no > low speeds. > The resistors are usually in the heater ducting around the passengers feet > or sometimes in the engine bay area passenger side. I concur, its the resistor stack, burned out between the #2 and #3 setting. If it was the switch or wiring, it would be more likely that you'd lose a single speed. On a related note, I'm surprised that auto manufacturers haven't gone to solid state speed control. They'd save a bundle on the control switch and wiring by using lower current components. SignaturePaul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ Do not interfere in the affairs of dragons, For you are crunchy and tasty with barbecue sauce. >> No, the switch is just a switch, they have a pack of resistors that adjust >> the current to the fan motor. When all you get it high, you have a full 12v [quoted text clipped - 9 lines] >On a related note, I'm surprised that auto manufacturers haven't gone to >solid state speed control. Some have. Many Honda's for example, Nissan, Gm also. Any vehicle with continuously variable blower speed. On those the pulse-modulated power transistor burns out frequently! Don www.donsautomotive.com >They'd save a bundle on the control switch >and wiring by using lower current components. > On a related note, I'm surprised that auto manufacturers haven't gone to > solid state speed control. They'd save a bundle on the control switch > and wiring by using lower current components. Paul, Surprisingly, the transistorized or stepless modules used in many cars with auto A/C are very expensive (to purchase at the parts counter), but that doesn't necessarily mean the part is expensive to produce. Some vehicles have shown pattern failures on these units as frequent as other models have had standard resistor block failures. The problem is there is usually a $100+ difference in cost in the auto style power controllers over the conventional style. But they do benefit as you surmise by eliminating the high current switch in the dash. I don't really have much desire for such splendorous infinite speed control over 4 speeds or Toyota's 7 speed setup they used to have in the Camry. Toyota MDT in MO > Car: 2000 Pontiac G.A. 3.4 > [quoted text clipped - 9 lines] > > MB I am not sure about your vehicle, but this is a common problem with Dodge. On a Dakota, there is a resistor pack that is mounted in the ductwork on the passenger side under the dash. I replaced mine in just a couple minutes (2 screws). It cost me under $10 for the part from a Dodge dealer. If I were you, I'd ask a GM dealer or maybe someone with a GM on here can tell you. Good Luck. Hank Blower resister,cost me about $40, mine went a year ago. Its under the dash,near the floor on passenger side. The resistor is a newer design compared to the original. > Car: 2000 Pontiac G.A. 3.4 > [quoted text clipped - 9 lines] > > MB Thanks for all the replys. I'll check my Haynes manual or my local dealer since I'm off on Mon. If I'm not mistaken this happend when this 6 year old car was about a year old and under warranty. I vaguely remember the dealer telling me that something had "cracked" and needed to be replaced. It was under warranty so I didn't pay any attention. MB > Blower resister,cost me about $40, mine went a year ago. > Its under the dash,near the floor on passenger side. [quoted text clipped - 13 lines] > > > > MB > Thanks for all the replys. I'll check my Haynes manual or my local > dealer since I'm off on Mon. If I'm not mistaken this happend when > this 6 year old car was about a year old and under warranty. I vaguely > remember the dealer telling me that something had "cracked" and needed > to be replaced. It was under warranty so I didn't pay any attention. Probably looks like this. http://info.rockauto.com/SMP/SMPDetail2.html?RU43.jpg It does but the GP Sorensen one I got from Advance has a longer circuit board than the original. May be a re-engineer of this product. It's in and seems to work fine. MB > > Thanks for all the replys. I'll check my Haynes manual or my local > > dealer since I'm off on Mon. If I'm not mistaken this happend when [quoted text clipped - 4 lines] > Probably looks like this. > http://info.rockauto.com/SMP/SMPDetail2.html?RU43.jpg |
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