How to Bleed Air from a 1993 Pontiac Grand Am Heater Core

An air-locked heater core prevents hot coolant from circulating, resulting in no heat. This procedure purges air using the radiator fill method.

Tools & Materials

• 50/50 DEX-COOL coolant (or specified type).
• Clean funnel.
• Rags, gloves, safety glasses.

Procedure

1. Park on level ground; engine cold.
2. Set heater control to MAX heat, fan on high.
3. Remove radiator cap (press down and turn).
4. Fill radiator to neck with coolant.
5. Fill overflow reservoir to COLD line.
6. Start engine; let idle. As thermostat opens (~195°F), coolant level will drop—top off radiator continuously.
7. Squeeze upper radiator hose to burp air.
8. When level stabilizes and heat from vents is hot, replace radiator cap.
9. Rev engine to 2,500 RPM briefly; recheck heat output.
10. Top off reservoir to HOT line after cool-down.

Tips

If no heat after procedure, core may be clogged—consider flush or replacement. Always use GM-specified coolant; mixing types causes gelation.