The blower fan only works on high, but the other day it stopped working even on this setting. I believe the heater resistor needs replacement. Any ideas on how to replace this without removing too many other things to get at it? Thanks in advance, Dave
The blower motor resistor is under the passenger side of the dash. If its still there you will have to remove the plastic cover, not tough. Your looking for a flat connector with 4 to 6 wires. The resistor will have 2,3, or 4 little bolts holding it in. It will be easy if you get a new one so you can see what it looks like. From what you described It sure sounds like the resistor.
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Well it could be any one of a few things ! There are two blower motor relays , two fuse's an the blower motor resistor, but wouldn't think that is the problem unless you have high speed blower operation ! But then again don't know if we are even talking about the same fan ? heater fan not cooling fan ?
You need a new blower resistor by the sounds of things. When you select
the three lower speed settings, the current supplied to power up the blower motor goes through the resistor, to slow the speed of the blower motor down. When the high speed is selected, the resistor is bypassed, and full current is passed to the blower. I believe the resistor is $12 at an auto parts store. Good Luck Tim
All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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If you bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge number of makes and models.
blower motor resister has burnt out also check wiring going to your blower motor resistor these must have a good tight connection or they will burn if any sighns of being hot change the complete wiring pig tail to your blower resistor
Yes, in high it bypasses the resistor and uses a high blower relay. But I think on 1998 Astro the High relay and the resistor are built together. It should be mounted in the blower box real close to the blower motor.