2002 Pontiac Grand Am Heater Core

2002 PONTIAC GRAND AM
71,000 MILES • 6 CYL • FWD • AUTOMATIC
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MONGOOSE25
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Facing the firewall, which line from the heater core is the inlet side? [ left or right ]
Oct 22, 2009 at 5:17 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
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Left.

If you have no heat, then with engine at temp, quickley touch both lines, if one is hot and the other is cool, then the core is blocked, if both are cool, then thermostat is bad.
Oct 24, 2009 at 10:23 AM
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