NHTSA Complaint #770366 — 1999 GMC SIERRA
ENGINE AND ENGINE COOLING:COOLING SYSTEM issue reported to NHTSA
Vehicle Towed
Complaint Details
| ODI Number | 770366 |
| Vehicle | 1999 GMC SIERRA |
| Component | ENGINE AND ENGINE COOLING:COOLING SYSTEM |
| Date of Incident | |
| Date Filed | |
| Mileage | N/A miles |
| Crash | No |
| Fire | No |
| Injuries | 0 |
| Deaths | 0 |
| Vehicle Towed | Yes |
| State | GA |
Consumer Description
I EXPERIENCED A SUDDEN ONSET OF A HISSING NOISE COMING FROM UNDER THE DASHBOARD. THE NOISE ONLY STARTS ABOVE 1400 RPM AND WHEN WARM. I HAVE TAKEN IT TO 2 GMC DEALERS AND 1 INDEPENDENT SERVICE SHOP. ALL HAVE STATED THAT THE NOISE IS WATER GOING THROUGH THE HEATER CORE. 1 DEALER SAID THAT THE COOLANT MUST HAVE BROKEN DOWN AND GELLED OR SCALED INTO THE HEATER CORE; THEREFORE, IT MUST BE REPLACED. GMC OWNERS MANUAL STATES CHANGE COOLANT AT 150000 MILE OR 5 YEARS, IF SO, WHY DID THE COOLANT BREAK DOWN? THIS APPEARS TO BE A MAJOR ISSUE AND I HAVE READ OF SIMILAR CASES. PLEASE HELP. DT
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