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1999 Pontiac Grand Am New heater core is leaking

Tiny
TJONZEN420
  • MEMBER
  • 1999 PONTIAC GRAND AM
Engine Cooling problem
1999 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic

I just replaced the engine and heater core, car is getting hot, and coolant smell and smoke coming from my vents and coolant is found in heater core compartment, I ran a hose through the heater core and it does not seem to have any leaks, what is causing this problem?
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Friday, August 28th, 2009 AT 11:02 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Remove the two heater core hoses on firewall, get a union connector and connect hoses, this will bypass the heater core, if problem goes away, then heater core is bad.

If car still overheats, start with compression test to rule out head gasket, If OK, the perform a cooling system pressure test.
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Saturday, August 29th, 2009 AT 8:15 AM

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