Replaced water pump, thermostat, fan repaired, no leaks,radiator cap replaced? What else can this be?
Try running the engine without the radiator cap. If the water is bubbling it may be the cylinder gasket if not,
check the temp needle if it moves fast when you turn on/off your headlights and aircon. if it does, you should put a grounding wire (neg) from the body to the engine. This solved my same problem.
It is either a blown head gasket or a cracked head. Depending on which motor your civic has, this could be a tricky replacement, either way, you have to remove the head off of the motor, and then take the head to have it pressure checked to see if there is a crack in it. Nine times out of ten though, you can see a crack in the head with your eye, but you have to have the right "eye" to be able to see the crack.
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I had the same prob. change pump, radiator, thermostat, fan. First check if its just electrical.
does the temp needle change if you turn on/off your headlights? you just might need extra electrical(neg) grounding on your body to engine. This solved my problem.
Your fan might be turning alright but is it at the sufficient speed? you should hear it really blowing at a hotter temp.
If you start your engine with the water cap removed, you must not see bubbles when you rev it, otherwise it might be the head gasket.
just for the curiosity (i also owns 96 civic) if its either of the problems, shouldn't he notice reduction of coolant ?
or contaminant on the coolant ? (oil ..)
I replaced the radiator on 96 Honda accord. when I pu water in it the water ran out near the oil filter
Radiator leaks...fan does not work
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