Coolant Leak From Heater Core on GMC Envoy

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 96,000 (96,000–96,000)
5 model years affected: 1998, 1999, 2000, 2003, more2006
10 people reported this problem
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Engine Overheating, found leakage of coolant below reservior tank, mechanic removed heating pipes, still problem persists