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.
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HOMESERVICE MANUALSPONTIAC1990FIREBIRD TRANS AM, 5.0 F, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C SYSTEM DIAGNOSIS - MANUALREFRIGERANT SYSTEM DIAGNOSISTHOROUGH CHECK PROCEDURE
1990 Pontiac Firebird Trans Am, 5.0 F, Standard
Thorough Check Procedure
1990 Pontiac Firebird Trans Am, 5.0 F, StandardSECTION Thorough Check Procedure
- Attach manifold gauge set, and refer to CCOT SYSTEM INSUFFICIENT COOLING CHARTS and V5 SYSTEM INSUFFICIENT COOLING CHARTS below. Compressor clutch cycles on and off during normal operation.
- When using insufficient cooling charts, note that procedures apply to all models. When checking compressor clutch cycling, it may be necessary to jumper different cut-off switches and relays to check system fully.
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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.