Rep Power: 0

I've got an 05 EX, (i read the sticky on overheating too, but I've got a couple more questions) and over the last week it's been overheating sporadically. At first it only ran hot at low rpms and low speeds, if you revved it a bit, the temp went down. At the same time, heat wouldn't work at low revs, but would at higher. Now the heat never works, the car is almost constantly way over temp, but the cooling fans don't kick in. One of my questions is if the sensor that feeds the gauge and the sensor that feeds the fan relay is the same sensor or not, and to add that even at really high operating temp, the upper hose is hot and pressurized and the lower is, mostly, colder and limp. The overflow has been filling and overfilling/spilling onto the fans. I'm thinking and hoping it's only a t-stat since the car only has 73k miles and has, for the most part, been treated nicely. Any ideas? Thanks!

 
Rep Power: 186

Head gasket.

Overflowing reserve/overflow tank is a tell tale sign.

Do a search for blown head gaskets.

My story. https://www.civicforums.com/forums/3...ml#post4620666

 
Rep Power: 0

Check the thermostat.

 
Rep Power: 209

most likely a head gasket....

you could try changing the thermostat and rad cap first (USE OEM HONDA PARTS)....its not likely going to help, but no harm in changing them anyway after 7 years

 
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I just drove it again, and this time it didnt go above 2/3 - 3/4 H and when cycling, the heat would lead the gauge by about 10 seconds. Again rpm independent.

 
Rep Power: 518

Keep the dang radiator full before you ruin the engine and cost yourself far more than it was already going to cost for the head gasket job alone.


I bet the head is already warped.

 
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Cars got a $5000 repair estimate from a wreck on it anyway. Think i might get rid of it. Get a different one.