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Engine coolingPart report

2004 Pontiac Bonneville Engine cooling Problems

Complaints
2about this part
Share
7%of 28 total for the year
Median mileage
22,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 2 complaints about the engine cooling of the 2004 Pontiac Bonneville, 7% of the 28 complaints for this model year. Where a mileage was given, the median is 22,000 miles.

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.

“Component failure-gauge cluster panel-2004 Pontiac Bonneville se 1. Failure - temp gauge failures prompted a computer check engine reading that stated the temp sending unit was probable cause. Dealer ewing buick-Pontiac did not have part, referred to reliable chevrolet who sold us the part as specified in tech pub but was not the correct sending unit. Compared the old one to another year model and located an identical sending unit within 48 hours but this did not fix the temp gauge. …”

NHTSA complaint #10175020, filed 2006-12, 43,000 miles

“The 3.3l engine stalled while driving at any speed. It also happened while the vehicle was in motion at 35 MPH. The vehicle as been to the dealer on 4 separate occasion, but they were unable to correct the problem.”

NHTSA complaint #10105245, filed 2004-12, 1,000 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
200514%
200427%
2003611%
20021011%
20012217%
20003717%
19995941%
199819470%
19975034%
19964329%
19955523%
19941416%
19932014%
199298%
1991314%
199013%
198914%
1987316%

Other parts of the 2004 Pontiac Bonneville

Electrical system
11 complaints
Steering
8 complaints
Brakes
3 complaints
Transmission and drivetrain
3 complaints
Air bags
2 complaints
Wheels
2 complaints
Equipment
1 complaints
Fuel system
1 complaints
Latches, locks and linkages
1 complaints
Other or unknown
1 complaints
Seat belts
1 complaints
Body and structure
1 complaints

← All problems reported for the 2004 Pontiac Bonneville

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 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