The heater core can also go bad and throw off the pressure in the radiator, which will cause a leak.Īlways make sure to fill your radiator with the same exact coolant that Pontiac recommends. It can create a high pressure pocket, and cause the radiator to leak. If the thermostat has gone bad, it throws off the equilibrium of the cooling system. This sediment can eventually knock a hole in the radiator over time. With enough time and mileage, the right rock, bolt, etc can get through and cause a radiator leak.Īs time goes by, your radiator can slowly fill up with sediment. The grill on a vehicle is designed to let enough air pass to the radiator that it is able to get enough air to cool your Grand Prix, while at the same time protecting against large debris. Here are some of the most common causes for a radiator leak: Typical Radiator This can lead to the engine accessories not turning fast enough to do their job.Īs the coolant hits the hot engine or exhaust, it can cause white smoke to shoot out from under the hood, even if you are not overheating. That is the sound of the serpentine belt slipping from the coolant. Overheating can cause serious long term damage, such as a bad head gasket or cracked head.ĭepending on where the radiator is leaking, it can get coolant onto the serpentine belt. The leak will grow bigger.Īs the radiator leaks, it’ll cause your Grand Prix to overheat. As the pressure created by the water pump pushes coolant through the Grand Prix’s radiator, it’ll follow the path of least resistance, which is through the damaged part of the radiator. When your radiator leaks, it’s best to replace it or have it repaired right away. If it is further back, it could be the radiator hoses or thermostat housing that are leaking.

It should be almost by where the bumper is. You should find that there is coolant under the vehicle.

Here are the most common symptoms of a leaking radiator: Coolant Under the Vehicle

2007 grand prix coolant tank leak