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.
Coolant Leak From Heater Core on GMC Envoy
Average mileage: 96,000 (96,000–96,000)
9 people reported this problem
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Towed .... not fixed yet. Part reasonable but labor outrageous !
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