My Temp guage rises all the way up after only a few min of driving or idling. on 1994 BMW 325i

i have a 1994 Bmw 325i and have just had to change the battery in the car. National Tire and Battery sold me a battery that is not the exact battery that was in the car, but they assure me it would work just fine. my car does start better than ever but now my temp guage starts to rise almost immediately and im wondering if its something to do with the battery itself or if its something to do with the car resetting after having changed out the battery.

by in San Antonio, TX on July 21, 2012
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1 answer
ANSWER by , July 22, 2012
Honestly, we work on a lot of BMWs here, and I don't see any way that changing the battery could affect the temp gauge, and especially *only* affect the temperature gauge. It sounds more like you have an air pocket trapped in the cooling system.