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The first indication is usually drips under the car under the front center. I have found they will usually drip for a long time before they fail. If you crawl under the front of the engine with a flashlight and look up under the harmonic balancer, you will be able to see the coolant seeping out. As the bearings worsen, the seal gets worse and the rate of the leak flow increases until eventually you have a major leak and overheating issues. On a 1978, it probably needs replacing anyway. Waterpumps are cheap for these cars, I got one with a lifetime warrenty (a good idea since they last about 4 or 5 years) for under $30. They are also fairly easy to install. Last weekend we replaced the water pump on my friends Chrsyer 300M which requires removing the fron engine cover, timing belt, etc.

Good luckvbdenny

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Q: How do you know when the water pump is bad on a 78 caprice?
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