Somerset V6-181 3.0L (1986)
Blower Motor: Component Tests and General Diagnostics
With Air Conditioning
1. Set FUNCTION SELECTOR in the A/C CONTROL HEAD to OFF, Blower Switch to LO, and Temperature Selector to COLD.
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Blower is off.
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No air is flowing from any outlet.
2. Set Function Selector to MAX.
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Engine idle increases and Compressor comes on.
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Blower runs at low speed.
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Air flows from Instrument Panel outlets.
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Air from outlets gets colder.
3. Change Blower Switch from LO to M1, from M1 to M2, and from M2 to HI.
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Air flow increases each time switch is moved to higher position.
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Cold air flows only from Instrument Panel outlets.
4. Set Mode Selector to NORM.
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Cold, high-speed air flows from instrument panel outlets.
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Blower sound decreases as recirculating door opens to allow outside air to enter.
5. Put Mode Selector to BI-LEV.
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High-speed air flows from instrument panel outlets and floor outlets.
6. Put Mode Selector to VENT.
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Engine idle decreases and compressor goes off.
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High-speed outside air flows from instrument panel outlets.
7. Put Mode Selector to HTR and Temperature Selector to HOT.
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Warm, high-speed air flows from floor outlets.
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No air flows from Instrument Panel outlets.
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Small amount of air flows from windshield outlets.
8. Put Mode Selector to DEF.
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Warm high-speed air flows from windshield outlets.
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No air flows from Instrument Panel outlets.
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Small amount of air flows from floor outlets.
9. Put Mode Selector to OFF.
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Blower turns off.
Without Air Conditioning
1. If the Blower does not turn OFF, install a new Blower Switch.
2. If the Blower does not run in LO or MED, check the Blower Resistors for an open resistor.
3. If the Blower does not run in any position, check the voltage at the ORN wires at the Blower Resistors.
NOTE: This check is performed at the Blower Resistor Connector, with the Ignition Switch in RUN and the Blower Switch in HI.
Terminal/Wire color ..................................................................................................................................................................................... Voltage
B/ORN .............................................................................................................................................................................................................. Battery
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If Battery voltage is present at the ORN wires and the Blower does not run, check the continuity of the BLK wire at the Blower Motor to
ground. If the ground is good, install a new Blower Motor.
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If there is no Battery voltage at the ORN wires, check the circuit back through the Blower Switch.
