Don juan

I'm having issues with overheating in a 05 honda civic lx. Last year, I had the head gasket replaced. Did fine for a year or so, then started having overheating issues. I noticed that the cooling fans were not kicking on at all, so I replaced the fan switch. I also replaced the thermostat at the same time. Now the fans come on at the normal temp when you crank it and let it idle(a little less than halfway up the gauge). No issue there. Then you drive it like 10 miles, the overflow fills up some, but the fan doesn't come on again until the temp is about 3/4 of the way up the gauge, a doesn't really cool it down, just kinda stays there at 3/4. Not sure what I'm dealing with here. I'm no mechanic. Please help if you can. Also, the new thermostat was supposed to be rated at a lower temp than the one that was on there. I had a friend I trust do the work. Never had him do anything but good work to all my vehicles

Colin42

head gasket may be blown again. when the overfill fills up is the rad down on coolant? (combustion gases pushing coolant into the overflow)

ezone

Thermostat rating change doesn't change the temp at which the fan switch turns on.