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93 dx + 92 lx
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333 Posts
Discussion Starter · #1 · (Edited)
So i NEVER overheat, once lost coolant on a driving road because my overflow tipped over and siphoned out and the gauge indicated warm (started shooting moonward) so i know that works fine.

But once my cooling fans kick on (within 5 minutes of reaching closed loop) they stay on.

Our other obd1 civic kicks the fan on and then it switches off.

Data show ect at a nearly unwavering temp just below 190 (188-189 degrees) but rarely changes once warm, seems to register/change fine as it warms up. Is this normal? Fan operation doesnt effect ect temp. Temp seems to fluctuate at the gauge, but not at ect. For example if I take it out of gear and hold 1500 rpm coasting down a long hill on the highway, the temp gauge creeps down slightly, data shows ect does not.

We dont have datalogging on the other car so i cant compare.

Wanna make sure its not actually that close to being so hot that the fan has gotta run all day before i start forcing air into this thing.

Aside from that its kinda annoying.
 

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Meat Popsicle
91 CRX Si
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2,942 Posts
My fan doesn’t turn on until after 200F and will cycle on and off when idling in my garage with no outside airflow.

EBF055 makes a good point. Make sure it’s running off the switch and not an ECU parameter
 

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Premium Member
90 crx si/96 accord
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788 Posts
I had a similar issue on my 96 accord....turns out the sending unit for the gauge was bad, hooked up to the obd2 port, was actually operating at ~240
 

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93 dx + 92 lx
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333 Posts
Discussion Starter · #5 ·
Mine kicked on at 182 today, and will kick on at idle and stay lit indefinitely. Iats today ranged from 88-136 so it was pretty warm and temp in tunerview stayed 188.2 in traffic, then at 60, then down a hill, then in hot azz traffic.... didnt budge .1 degree.

Either tunerview is messing up or the ect sensor is messin up or I'm gonna overheat when I go turbo... ive seen h22s run half rads tho so I should be nowhere near overloading the system as is, making maybe 100hp. Hmmm. I sure hope its a sensor issue.

What does an ect sensor act like when its on the fritz?
 

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93 dx + 92 lx
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333 Posts
Discussion Starter · #7 ·
Is that how one would go about testing the sensor? No, i dont though.
 

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93 dx + 92 lx
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Discussion Starter · #10 ·
Yeah they are similar at cold startup. It rises to 188 and never higher, and the fans stay pegged.

Should I do a stress test and run it w less coolant to see if itll show over 188? Or just say effet and throw parts at it? I need to rewire my o2 sensor ground and clean the tstat housing up anyway, a new temp sensor and tstat are cheap
 

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93 dx + 92 lx
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333 Posts
Discussion Starter · #11 ·
Or hey, what if i just unpluggerred the fan and see if it heats up?
 

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93 dx + 92 lx
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333 Posts
Discussion Starter · #13 ·
Yeah you'd think right? 90 degree day, high humidity with iats hovering near 115, no fan, hard drive then stop and go traffic. Ect stayed below 190, got to a point, wouldnt budge either way.... temp gauge also indicated completely normal.
 
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