I have a 1997 eclipse rs and I recently change mi heAter hose because it was leaking them I find out that one tube from the heater core in bend it so it leak. And sometimes the temperature on the gauge go up but them go down but doesn't stop leaking...there's any way that I can stop to leaking? Or I have to cange the heater core? And if a do have to change heater core which are the steps to do it thanks...