Coolant Leak From Heater Core on GMC Envoy

The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.

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Average mileage: 96,000 (96,000–96,000)
4 model years affected: 1998, 1999, 2000, 2006 more
6 people reported this problem
2 people shared problem details
2006 GMC Envoy96,000
not fixed yet. my mechanic tells me its very expensive.
Engine Overheating, found leakage of coolant below reservior tank, mechanic removed heating pipes, still problem persists
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