Motor heater not working on low and sometimes on high
I have a 1998 Astro Van, and the motor heater is not working. One solution was to change resister, the other was the motor. Now my question is where is this stuff located? Where do I go to find a diagram?
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Re: Motor heater not working on low and sometimes on high
Blower/Heater Switch Operation:
This electrical switch, located in a fuse or breaker protected circuit, controls the rpm of the blower motor through a series of control relays and a rheostat. Sometimes the A/C compressor clutch is energized by this switch.
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Hi, check fuse 12 first. If it is good, you will need to replace the blower resistor. The high speed relay is built into the resistor. The resistor is next to the blower motor and looks like the picture below. There is a connector in the resistor and the 2-wire connector coming out of the resistor attaches to the blower. The blower is usually under the dash above the passenger's feet. You may have to remove a kick panel to see the motor and resistor. Please let us know if you have any questions, and thanks for using FixYa.
The blower resistor has gone bad which is why you lost blower speeds.This may have been caused by the blower motor drawing too much power. At this point I would verify that no fuses burned out and then check the pigtail plugs going to the resistor and blower motor to make sure the connectors and connections are not melted or wiring is frayed. These connectors are located in the engine compartment on the passenger side. After checking this and if everything appears ok then the blower motor itself has probably gone bad and needs replaced. I would also replace the blower motor resistor as well. If the connectors appear damaged replace or repair as needed .
The resister pack next to the motor is bad you can buy a replacement for about $20.00 the plug is near the fan and on the heater box held in place by a 5 prong plug. Has two nuts 1/4 inch that unscrews and just pulls out.
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.
No the motor is not bad or going bad, the heater blower motor resister is bad, thats regulates the blower speeds, its located under dash by heater motor 2 screws hold in heater box with a electrical plug to it.
Check your emergency brake to see if it is released all the way. 1or2 clicks on the brake will make the auto lihgts not come on. Try turning the blower motor on and then tapping on it...makes mine work.