1998 Pontiac Bonneville Engine And Engine Cooling:cooling System Problems
NHTSA component category: ENGINE AND ENGINE COOLING:COOLING SYSTEM · data through 07/12/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How engine and engine cooling:cooling system ranks on this vehicle
Share of the 277 complaints citing each category; one complaint can cite several. Full breakdown on the 1998 Pontiac Bonneville overview page.
What owners report
“UPPER INTAKE CRACK WHICH CAUSED COOLANT LEAK INTO INTAKE AND FUEL SYSTEM. DT”NHTSA complaint 770478 — filed 12/05/2002
“WHILE DRIVING VEHICLE STALLED OUT. HAD VEHICLE TOWED. THIS WAS A RESULT OF COOLANT FUEL LEAKING.DEALER CONTACTED.”NHTSA complaint 8016899 — filed 08/21/2002
“ENGINE WOULD NOT RUN DUE TO COOLANT IN CYLINDER/S, COST TO REPLACE PLASTIC INTAKE MANIFOLD APX. $900.00 THE TERM DEGRADE AS USED BY GM SHOULD…”NHTSA complaint 764945 — filed 07/30/2002
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Engine And Engine Cooling:cooling System complaints by year filed
Frequently asked questions
Does the 1998 Pontiac Bonneville have engine and engine cooling:cooling system problems?
Engine And Engine Cooling:cooling System is the #5 most-reported problem area on the 1998 Pontiac Bonneville: 25 of 277 complaints on file (9%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 1998 Pontiac Bonneville have in total?
277 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 9 involved a crash, 28 involved a fire, 7 reported injuries, and none reported deaths.
What does NHTSA's engine and engine cooling:cooling system category include?
NHTSA assigns each complaint to standard component categories; this page reports the ENGINE AND ENGINE COOLING:COOLING SYSTEM category exactly as NHTSA defines and records it.
