GMC Interior Antifreeze Leak

GMC
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BLK_KOFI
  • MEMBER
  • 1 POST
there is antifreeze on the floor drivers side. the car smells like antifreeze and the windows fog up from the inside. my brother in law installed a new heating coil and it is still leaking. could it be that he did not install it correctly or could there be another problem?
Jan 23, 2006 at 1:52 AM
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DARRYL
  • MEMBER
  • 61 POSTS
HELLO: Sounds like either a defective heater core or the hoses are not on tight at the firewall and coolant is sneeking past into the passenger compartment. Check it oyt, but it is one of the two
good luck
Darryl...
Jan 23, 2006 at 9:41 AM
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MVANNESSJR
  • ✓Experienced Mechanic
  • 223 POSTS
Sounds like a broken heater core. This is usually located passenger side behind the firewall in the cabin. This would explain the pool of coolant inside the car. The fogging is due to the hot coolant circulating in the car, you should notice the engine running hot. If it sprays enough inside the car it can damage the ECU and other electronics in the dash... You will want to fix this as soon as possible.
Jan 23, 2006 at 1:13 PM
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Suggested Repair

Replace the leaking heater core on the passenger side behind the firewall. Coolant in the cabin is causing the floor puddle, antifreeze smell, and interior window fogging. Repair it promptly so it does not damage the ECU or other dash electronics.

Conversation Summary

A GMC has antifreeze on the driver's floor, an antifreeze smell, and windows fogging from the inside after a new heater core was installed and continued to leak. Replies point to a defective or broken heater core, or heater hoses not sealed tightly at the firewall, allowing coolant into the cabin. The expert advises repairing it as soon as possible because circulating hot coolant can also make the engine run hot and damage dash electronics.

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