1999 GMC Sierra engine and engine cooling problems
17 owner complaints filed with NHTSA name the engine and engine cooling on the 1999 GMC Sierra — 3% of all complaints for this model year.
What owners report
“Brake fluid leaking all over bottom of truck spraying out I took to a mechanic and had 1000 dollar brake line job done got truck back and abs brakes worked like manual brakes had a sensor and 2 ball joints replaced im being ripped of from a gmc loyal customer I was I guess back to ford or toyota…”
filed Jan 31, 2014
“Two broken manifold bolts in rear drivers side of engine on 5.3 vortec engine, exhaust leak from where manifold has separated form head. Carbon buildup and discoloration visible. High temp exhaust being released under the hood. Appears to be a very common complaint on many gm vehicles and model…”
filed Feb 9, 2012
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine and Engine Cooling problems in other Sierra years
| Year | Reports | Share |
|---|---|---|
| 2015 Sierra | 1 | 2% |
| 2012 Sierra | 1 | 3% |
| 2011 Sierra | 1 | 2% |
| 2010 Sierra | 1 | 3% |
| 2009 Sierra | 1 | 3% |
| 2007 Sierra | 2 | 3% |
| 2006 Sierra | 1 | 2% |
| 2005 Sierra | 9 | 8% |
| 2004 Sierra | 4 | 2% |
| 2003 Sierra | 9 | 4% |
| 2002 Sierra | 22 | 9% |
| 2001 Sierra | 22 | 8% |
Other reported problem areas on the 1999 GMC Sierra
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.