Rep Power: 0

My 2004 civic lx is overheating again. Last time it was the relay. This time around We replaced the relay,thermostat,coolant censor,fan censor and drained antifreeze and put new in. Also tried burping it and nothing happened. The fan doesn't want to kick on unless the a/c is on. It works when a/c is running. The car has 150k miles on it. Thanks for advice in advance.

 
Rep Power: 209

your head gasket is probably blown,

does the coolant level in the overflow bottle rise up really high?

as in to the top, or possibly overflows?

that is a sure sign of head gasket failure

 
Rep Power: 0

No it didn't, level stayed the same. There also is no antifreeze in the oil. Checked that. And no white smoke from exhaust.

 
Rep Power: 209

my money is still on the head gasket,

what type of coolant did you use when it was replaced?

 
Rep Power: 0

My husband informed me drained only out of radiator, not a complete flush. And he put in 50/50. We have a appointment made for it to go in on Wednesday. Just hoping not to expensive fix, but have a feeling it will be. thanks for replying also.

 
Rep Power: 209

50/50 but what brand name?

these engine are very particular to coolant type, the only thing you should be using is honda OEM blue coolant, anything other than that is a big mistake,

if you have not used honda OEM blue coolant, then the first thing i would do is drain the entire system and replace it with the blue coolant

 
Rep Power: 186

+1 on the head gasket

Replace your head gasket. Your overheating will stop.

FYI, oil and coolant don't mix in this engine when the head gasket is blown.

Also, see this link: https://www.civicforums.com/forums/3...reference.html

 
Rep Power: 518

If you keep the AC on (so fans run), does it still overheat?

If you jumper the 2 wires for the coolant temp switch in the thermostat housing, do the radiator fans run?