Operation CHARM
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Pontiac
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1992
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Grand Prix V6-191 3.1L
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Repair and Diagnosis
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Heating and Air Conditioning
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Testing and Inspection
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Component Tests and General Diagnostics
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Troubleshooting Hints
Troubleshooting Hints
1.
Check for vacuum to the Solenoid BOx.
2.
Check HVAC Fuse and CLUST Fuse.
3.
Move the Temperature Lever to full Cold and then full Hot. Listen for the sound of the servo motor moving the valve through its full range.