Engine Overheating Due to Water Pump Leak on Pontiac Bonneville

The water pump may develop a coolant leak resulting in an engine overheating condition.


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Average mileage: 151,053 (97,000–246,000)
Engines affected: 3.8L V6, 3.8L V6 Supercharged
16 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
36 people reported this problem
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Viewing 1 - 12 of 12 problem details
2001 Pontiac Bonneville - 3.8L V6 Supercharged 97,000 mi,
I haven't got the problem fixed yet. I will have to take it to the shop because I am not car SAVVY. I noticed my cars temperature needle rising alot so I would add coolant. Over time I seemed to be having to add a half a gallon to a gallon every two to three days. Today I decided to add water to the radiator and to the reservoir but I left the top off of the radiator when I started the car. The coolant flowed smoothly from the reservoir to the radiator. It started to leak around the hose in between the alternator and the belt on the supercharger. I have researched online figured out that I may possibly need to replace my water pump
I was sitting in front of a convenience store with my car running and my car began to smoke. I got out popped the hood of the car to see all my coolant leaking from my car.
2000 Pontiac Bonneville - 3.8L V6 Supercharged 150,000 mi,
Failing water pump caused an antifreeze leak as well as overheating. It also caused the heater to stop working as well when coolant would get low.
1998 Pontiac Bonneville - 3.8L V6 146,000 mi,
Water pump is literally spraying water everywhere. I have never in my life seen a water pump fail like this.
1993 Pontiac Bonneville 127,000 mi,
over heating waterpump leaking
2004 Pontiac Bonneville 161,000 mi,
Engine keeps overheating
2002 Pontiac Bonneville 246,000 mi,
Overheating, losing water, replaced radiator and hoses, problem continued. Replaced thermostat. Problem continued. Replaced water pump. Problem solved.
1995 Pontiac Bonneville 199,800 mi,
Leaking from, elbo, male end on tensioner and from the bottom of the water pump seal. Replaced plastic elbow with aluminum elbow, replaced "Tensioner Thermostat Seal (o-ring) dealer part $4.00 {yes it is part specific, the one in the elbow two pack will not work, it's not the right material}, changing 1st design gasket & using wit h "water pump" grey seal gasket maker $4.00 in the morning. Yes, I didn't discover the water pump seal leak until I had already reassembled the other parts. Save time if doing one replacement seal replace all the seals in the related area.
2001 Pontiac Bonneville - 3.8L V6 Supercharged 101,000 mi,
Coolant leaking, Car overheating. Took it in and water pump went out. approx. $400 to fix.
water pump was leaky....replaced and it was okay
1996 Pontiac Bonneville - 3.8L V6 140,000 mi,
leaking coolant around water pump. Last GM vehicle I'll ever buy.
2003 Pontiac Bonneville - 3.8L V6 140,000 mi,
engine overheating and serpentine belt broke because of water pump failure. 140,000 miles