1999 Pontiac Bonneville engine and engine cooling problems
59 owner complaints filed with NHTSA name the engine and engine cooling on the 1999 Pontiac Bonneville — 41% of all complaints for this model year.
What owners report
“Tl*the contact owns a 1999 pontiac bonneville. In 2003, while driving 15 mph, the contact noticed a huge cloud of white smoke at the rear of the vehicle. The dealer stated that the intake manifold had blown the gasket. The intake manifold gasket was replaced as well as the intake manifold itself…”
filed Jul 21, 2008
“Plastic engine intake plenum assy meltdown causing coolant into cylinders of engine. Original incident identified to possible damage to 1st cylinder. Plenum assy replaced with metal sleeve which mechanic claimed was superior to original mfg part. Prior damage to 1st and 2nd cylinders became…”
filed Jan 28, 2008
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Engine and Engine Cooling problems in other Bonneville years
| Year | Reports | Share |
|---|---|---|
| 2005 Bonneville | 1 | 4% |
| 2004 Bonneville | 2 | 7% |
| 2003 Bonneville | 6 | 11% |
| 2002 Bonneville | 10 | 11% |
| 2001 Bonneville | 22 | 17% |
| 2000 Bonneville | 37 | 17% |
| 1998 Bonneville | 194 | 70% |
| 1997 Bonneville | 50 | 34% |
| 1996 Bonneville | 43 | 29% |
| 1995 Bonneville | 55 | 23% |
| 1994 Bonneville | 14 | 16% |
| 1993 Bonneville | 20 | 14% |
Other reported problem areas on the 1999 Pontiac Bonneville
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.