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So, I was going to clean my intake manifold on my 1995 Integra and in the process I had to drain the cooling system. Well, after I got done and put everything back together, I flushed the cooling system and put fresh coolant in with distilled water 50/50. Drove it around and saw that it started to overheat. I noticed the radiator fans would not kick on. I did another flush, I even filled the system up with just water and the thermostat out and ran the engine to get all the antifreeze out. Flushed it again. I tested the thermo in a pot of boiling water, it was fine. I put it back in, refilled the system making sure that I opened the air bleeder, then ran the engine to operating temp and squeezed the hose. Still overheating, fans won’t kick on. I checked the fuses and switched the relays, they’re fine. The fans only turn on with the AC. Another observation is the upper hose is hot, lower hose it cool. I checked the ECT switch with a paper clip, it’s fine. I know the temp sensor it good. I didn’t have these problems before this whole operation. I have no idea where else to look. I’d really love any information. Thanks.
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That might be the Oil temp sensor. Which is weird because it is next to the upper radiator hose. The ECT on the integra is located on the thermo housing, which I did take off a few times. I’m not sure if just taking it off can effect the sensor giving it exposure.
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