2000 honda civic coolant overflowing out of overflow?
Ok so just bought this 2000 civic lx about a month ago with no issues until the other day when i got to work i was letting the car idle for a little and noticed the temp start rising while parked. Shut it off and let cool down immeditly. Noticed the fan was not kicking on and tested the fan and relay and they worked so i went ahead and replaced the thermostat and coolant fan sensor, drained old coolant and flushed it with water then added new coolant and burped the system. Now car does not overheat when stoped and fans kick on and off like they should. However once i drive it a little far i notice the coolant overflow fills up and overflows. You can hear the overflow tank bubbling at times. So did a block test on it and it passed multiple times… I also tried re burping the system and bubbles will go away but when i give it a little gas i notice some bubbles come up don't know if this is normal? I have had these issues before on a previous car and it was a blown head gasket but that car would overheat everytime i stopped and failed the block test. THIS car however is not getting hott anymore when stopped, fans kick on and off, temp never gets warm but it continues to overflow? Any ideas what this might be?
Also oil is clean and no smoke out the exhaust.
Test or replace the radiator cap.
Use a heat sensor gun to find out if the radiator is partially cold compared to the rest of the radiator. The radiator may be plugged up.
When small air bubbles keep forming in the cooling system you have a head gasket beginning to fail.
Best get the cylinder head pressure tested if you replace the head gasket as it sounds like you may have a cracked cylinder head.
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