Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Pontiac LeMans GSE, AutomaticFACTORY OEM SERVICE PROCEDURE
Heater Blower Switch Testing
- Measure continuity between terminal of blower motor switch and corresponding terminal on blower resistor connector. If continuity does not exist, repair open wire. If continuity does exist, go to next step.
- Check continuity on blower fan switch. See HEATER BLOWER SWITCH CONTINUITY . If continuity does not exist according to specifications, replace blower switch.
HEATER BLOWER SWITCH CONTINUITY
| Switch Position | Continuity Between Terminals |
|---|---|
| LOW | Blue/White & Yellow |
| MEDIUM | Green/White & Yellow |
| HIGH | Brown/White & Yellow |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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