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Originally Posted by glenn davis
When I removed the cap the coolant level rose higher in the tank.
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DON'T do this! Here's the deal. Your coolant is under pressure. The pressure keeps the coolant from boiling even though places in your engine will be over 212F (100C). When you pop the cap on the coolant system you flash boil all the coolant in the hottest parts of the engine. This expanding steam will push coolant out of the engine into the reservoir. That can cause overheating and scaling in your engine. So avoid the urge to pop the coolant cap open until the car has cooled off significantly.
If the temperature indication in the car is in the normal range of operation 180-220 (depends on thermostat) then the impeller is functioning sufficiently. A failing pump bear may leak, or you may have a nicked hose, or a leaking reservoir. There are a lot of things that can cause you to lose coolant. Can you post what you mean by "running bad?" Take a good look around the underside of the car to see if you can locate where the coolant is going.