Mounted right next to the radiator.
It can be very simple to remove the radiator from a Honda Civic. The first step is to drain the coolant from the radiator. The next step is to disconnect the cooling fan switch and remove the hoses. Then the cooling fan should be removed. Then the radiator should be unbolted and lifted carefully from the vehicle.
Its on the thermostat housing by the upper radiator hose
right at the end of the top radiator hose near the engine
The cooling system is bled using the bleeder screw found on the thermostat housing. To find the thermostat housing on a 1998 Honda Civic follow the lower radiator hose to its outlet. While the cooling system is running loosen the bleed valve. When bubbles stop coming out the system has been bled.
more than likely the head gasket
In the radiator.
No.
yes
Complete cooling system service. Drain, flush, new thermostat, clean exterior of radiator, install 50/50 mix of coolant, bleed air from system, check operation of water pump and cooling fan.
upper or lower?
Nothing if you steal it