heating problem again!!!!!

[swift1069]

I replaced everything on the car to do with the cooling system. I know I have a minor leak,and when the car loses about 2 cups of water it wants to start to over heat. But if I open up my heater core valve and allow water to flow then the car wont over heat, even when it gets lower on water.. I'm thinking there is a blockage somewhere but I've watched it with the radiator cap off and the water seems to be circulating fine.. I thought it could be my sterio system too, because when the bass hits hard at a idle the motor will stumble a bit, but I turned the sterio off for a few days and noticed it does the same thing... If anyone has any thoughts let me know.... Could it be a weak water pump and not circulating the water fast enough???

[BullShifter]

Where is it leaking from? It's over heats when low because of an air pocket. If you replaced every thing how could it be leaking?

[civickiller]

leaking will cause a loss in pressure, whihc is probably causing your overheating

[swift1069]

well the only thing that hasn't been change is the o rings on the water line that runs from the themostat housing to the back of the water pump... that and the head gasket but I'm leaning more to a leaking head gasket for a water leak because there is always a bit oil on top of the tranny. At first I thought it was all coming from the seal in the distributor because I started to notice a bit of oil on the inside of the distributor cap... ... I have good even compression in all 4 cylinders.but probably just a matter of time before it starts to leak into the cylinder