Overheating Honda Civic (2000) 4 door.

most common causes of blown head gaskets are engine overheating. could be caused radiator cooling fans inoperative, cooling system leaks, clogged radiator passages,or sticking thermostat. if a head gasket is severely blown the cooling system will pressurize very rapidly on cold engine startup. other more rare cases of head gaskets blowing could be loose head bolts. make sure new head bolts are used and torqued correctly if service manuals recommend new head bolts.

A few questions first...are you sure its overheating and not just a bad temp sensor? is yes then how many miles on car? if over 90K than did you have the water pump replaced with your timing belt?Is your fan coming on at all? Is your radiator full?If your water pump has been changed and your radiator is full and your fan is working properly and you have a new thermostat then you should take your radiator off and have it flow tested to make sure its operating properly, and no you cant just pour water through it to tell if its working properly.

no it might have problem inside the engine also the check light should lighted get it diagnose to find what is the problem overheating really problem on the engine might be also thermostat issue have it check specially with check lights are on

blown head gasket or cracked head !

MAKE SURE YOUR FAN IS RUNNING.

if your loosing coolant and its not dripping on the floor then the only option is you have a blown head gasket. This can be tested using what is called a chemical block test or a smog machine can sniff your coolant for fuel that isbeing pushed past the bad head gasket. This is a $2000 dollar job if the gasket is bad.

with the engine cold take off the radiator cap start the engine if puffs of smoke start to came out you have a blown head gasket or cracked head also try taking out the thermostat if its stuck closed it will cause it to overheat

is the fan working

COULD BE COOLANT SENSOR,HEAD GASKET,CHECK THE TIMING,THE PROPER MIXTURE OF COOLANT,WATER PUMP.DID YOU HAVE IT CHECKED OUT?ANY LEAKS?HEAT WORK WITH FAN?

2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. 4 Inspect Radiator Cap Worn or damaged radiator cap 5 Inspect Thermostat Thermostat stuck closed 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). 8 Inspect Water Pump Damaged, worn or leaking water pump. 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders here is a list of things to check Shaun