1999 GMC Sonoma Engine cooling Problems
- Complaints
- 4about this part
- Share
- 7%of 57 total for the year
- Median mileage
- 30,400miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine cooling of the 1999 GMC Sonoma, 7% of the 57 complaints for this model year. Where a mileage was given, the median is 30,400 miles. 1 a fire, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I have encountered several different chevy/Gmc vehicles that are experiencing a lagging start and in some cases no start without a boost. My Sonoma has the lag and I have a few friends that have blazers and full size trucks as well. The variation of engine sizes that are affected has me perplexed. I have attempted to run codes with no fault results. This occurs every time I attempt a startup.”
NHTSA complaint #10253811, filed 2009-01, 26,000 miles“Not sure if belt broke first or fan blade the blade broke off and flew inside of truck causing damage to parts under the hood it was 1000.00 to fix all the parts broken by this. I have all the old parts. The belt was ok but something caused the blade to brake off and there are noticeable cracks in the blade around the nut. Because of this failure I had to replace a lot of components under the hood.”
NHTSA complaint #10157484, filed 2006-05, 100,000 miles“The heater on my vehicle has stopped working and the manufacture (Gmc) and the dealership refuse to cover it under warranty. There is a NHTSA bullerin on this (634218). I would like to know how many other vehicles like mine (1999 Gmc Sonoma) have experienced this problem.”
NHTSA complaint #10020722, filed 2003-05, 30,400 miles“1) boyfriend driving, pulled up to intersection, truck stalled, restarted, died, noticed smoke, opened hood, fire near battery and antifreeze container, put out with snow, vehicle towed to dealership, contacted GM, told a rep would contact me within 24-48 hours, that was a week ago, no call, vehicle just sits!! 2) ABS light on, told by dealership to make appointment, not a big deal. When light was on that was true, but light didn't always come on and it was like a brick was behind the brake. Had to slam on it! Not good on these winter roads. …”
NHTSA complaint #718952, filed 2000-02Related service bulletins
- 10246631Sep 1, 2013Expanded Availability for Remanufacture and Return (R&R) Electronic Control Modules
- 10139019May 3, 2013This preliminary informational bulletin provides information on High Oil Pressure on Startup After Engine Replacement Concern.
- 10012703Feb 1, 2004Diagnostic information for intermittent vehicle no crank dead battery.
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2003 | 1 | 3% |
| 2002 | 4 | 7% |
| 2001 | 7 | 8% |
| 2000 | 6 | 4% |
| 1999 | 4 | 7% |
| 1998 | 11 | 7% |
| 1997 | 8 | 7% |
| 1996 | 19 | 13% |
| 1995 | 26 | 12% |
| 1994 | 12 | 5% |
| 1993 | 7 | 12% |
| 1992 | 2 | 8% |
| 1991 | 4 | 14% |
Other parts of the 1999 GMC Sonoma
9 complaintsSeats
8 complaintsBody and structure
8 complaintsTransmission and drivetrain
8 complaintsAir bags
6 complaintsElectrical system
4 complaintsFuel system
3 complaintsOther or unknown
3 complaintsSeat belts
3 complaintsSteering
3 complaintsVehicle speed control
3 complaintsExterior lighting
2 complaints
← All problems reported for the 1999 GMC Sonoma
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology