PrecisionH23a

Long story short....

Old motor dropped a sleeve, block was replaced and resleeved with all new parts. All new bearings, piston rings, OEM gaskets, etc etc. The only thing re-used was the OEM timing belt and OEM water pump (500 miles).

So while I was heat cycling the engine for proper break in, the temperature steadily increased and the fans never kicked on. The engine temp went 1 bar above half so I immediatly shut the engine off realizing the fans did not activate. I hooked up hondata and sure enough the temps were going to 203 degress without the fans kicking on. The top hose was HOT whereas the bottom one was COLDDDDDD.

Common sense tells me thermostat... I buy a new one at honda... same overheating problem. I swapped the new one out with another one and it still overheated. I removed the thermostat and let the car run.

The temperature SLOWLY went up to 190 then the fans kicked on. No problems of overheating AT ALL.

So am I safe to say the water pump is shot? I find it hard to believe 3 thermostats are bad... I even swapped sensors out.

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kansludeman

i dunno, my fans don't turn on unless i have the AC on...and i just changed out my radiator, ECT sensor, etc..so i really don't know what to you tell you, thats just my experience

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PrecisionH23a

The fans turn on when AC and Heat was activated by the way...

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mtbprelude

Yes, Its a smart idea to replace your water pump. I'm assuming these are OEM type thermostats, so also to prevent overheating you may want to look into a lower temp thermostat. Offhand I do not know where to get them, though.

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Whitea207

When my engine was overheating, i found my thermostat was bad... so i just took it out, didnt replace... you I can get away with that since i live in TX and it hardly ever gets cold, but thats what i did, and overheating problem, solved/

autoluder

usually a good thermostat when it goes bad should end up in the open position and your car would run cold to be on the safe side

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Zbone

Did you properly refill your coolant? (using the bleed nipple to vent the air out of the system?)