prodjay10

Where can coolant leak from? Am I missing anything?

1) Radiator
2) Radiator hose upper and lower
3) Water pump
4) heater hoses
5) head
6) cracked block
7) overflow
8) Radiator cap
9) heater

2004 civic

Former User

Pressure test the cooling system for leaks.

prodjay10

I did and it wouldn't leak but there were bubbles in the system and it overflowed thru the reservoir. I over pressurized and the lower radiator hose started leaking at the thermostat. I cleaned up the hose and thermostat housing and readjusted clamp. Stopped leaking. Now the bubbles seem to be gone and no overheat or overflow.

prodjay10

When topping off coolant, I have the car nice and hot with the heater off and there are no bubbles in coolant.

If I turn on heater to get coolant in there too, there are bubbles and they don't stop. They just continue coming no matter how long I top off coolant. There are no leaks. Would you think this is a partially clogged heater core? There is heat coming out of the vents.

I want to flush heater core with some CLR, just wanted to see if anyone else had this issue.