The relay is sticking. Replace it.
The IMPELLER on the water pump.The MIXTURE of Anti-Freeze to Water mixture.Blown head gasket.Correct TIMING.the FLOW on the Radiator that U already checked...
1992 and 1993 Honda Civics and Civic Del Sols with the 1.5L FI SOHC and the 1.6L MFI engines 1995 Honda Civics and Civil Del Sols with the 1.5L MFI SOHC, 1.5L MFI VTEC SOHC, and 1.6L MFI VTEC SOHC engines 1994 Honda Civic CX, Civic DX, Civic VX, and Civic Del Sol S with the 1.5L MFI SOHC engine 1994 Honda Civic EX, Civic SI, Civic Del Sol, and Civic Del Sol SI with the 1.6L MFI VTEC SOHC engine 1994 Honda Civic LX with the 1.5L MFI SOHC engine 1996 and 1997 Honda Civic Del Sol with the 1.6L MFI VTEC DOHC engine
I think that either your radiator is plugged up, not allowing your coolant to use the full volume and/ or surface area of the radiator. Also, your thermostat might be stuck closed not letting your coolant to circulate through the block. And last thing, make sure that your electric cooling fan comes on when the car gets above 180 degrees. My answer is to replace your thermostat, flush and clean your cooling system (by a professional radiator shop)with a strong cleaner, and make sure there are no leaks in your cooling system, your car has a closed system, a leak will make it over heat too.
Get that to a windshield reseller...
Look at lower rear of engine
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
The radiator alone, aprox 2 qts. The complete cooling system, aprox 8 qts.
In the radiator.
No.
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.
yes
lack of coolant . no cooling fan operation, low engine oil, improper coolant mixture, thermostat stuck, debri on radiator , restriction in cooling system.