1996 Pontiac Bonneville Engine cooling Problems

“1st the plenum was melted by the EGR valve, which caused me to be stranded. When that was fixed, I began hearing a high pitched whine once the engine is heated up. We have replacedthe harmonic balancer power steering pump, water pump, all belts, checked the timimg chain, and everything else we could think might be causing it, but I still have the whine. Cause is unknown still.”

“While cranking my 1996 Pontiac Bonneville I heard a big explosion. I look under the hood and found the plastic cover over my intake with a hole blown fron the engine. I further removed the intake cover and tha intake had a ripping hole in it also, as if the top of my engine blew up.”

“Around jan 2008 while driving a plastic water hose burst. I replaced it and had no other problem until around aug 2008. This time the water pump started leaking. I replaced that and the thermostat and radiator cap, but I still kept loosing coolant. Then I found a crack in the radiator which I replace around the end of aug 2008. I still kept having to top off the coolant reservoir ever two days. About june 2008 I started having trouble with the veh starting, it would seem like it wasn't getting enough gas or flooding. …”

“The engine on this car failed. It has 115,000 miles. It was maintained from the start. We purchased it new. The intake manifold failed and leaked antifreeze throughout the motor. We had the manifolds, oxygen sensors, and catalytic converter replaced. We found out there was a TSB issued on this vehicle regarding the manifold problem. Pontiac and the dealership were contacted. They both told us it's a common problem, but they'll do nothing. …”

“My 1996 Bonneville started acting up, roughly idling, and hesitating when taking off. There was loss of power, poor gas mileage, car would shut it self off while driving down the highway.check engine light came on and started flashing. Took it to auto zone to get it checked. Scanner idicated that it had multiple misfires, and that my map sensor was bad. Replaced map sensor. Still didnt change on how the vehicle operated. Replaced one of coil packs, still nothing. Put new plug wires and nothing cahned. New oxygen sensor installed, and still nothing. Changes. …”