evokiller666

I have a 1990 integra im not a noob to cars but im to the inegra. My radiator fan keps running. Ill turn my car on for 20 min and turn it off and the fan will run for hours. It doesnt seam to be killing the battery. BUT you reley can't tell. Any advice would be nice!!!

PatrickGSR94

iTrader: (1)

Older Hondas were wired to run the fan even with the car off, I guess to help cool the engine down. But it shouldn't be running for that long after only driving 20 minutes. I would think the fan should only run 15-20 minutes or so at the most. It could be a problem with the fan switch or the sensor that controls the fan based on coolant temperature.

evokiller666

so should i replace them or just not even worry bout it

mikeintegra93

I had the same issues with my 93 1.8 integra. Check your temp gauge, and also check your radiator fluid. There was no radiator fluid in there, and I'm lucky I caught it before I did more damage.

If you haven't flushed or even checked your coolant, its possible its low and needs more. This would cause the car to run hot, and make the fan stay on for extended periods of time, even after you turn it off.

Good luck!

vietnamezerice

Good info... he hasn't posted back, must have fixed the problem

evokiller666

i flushed the coolant reacently and checked it. it was kinda low when i flushed it but it's good now. so im thinking it might be the temp gauge.

vietnamezerice

i don't think the temp guage will affect the can... i believe the coolant temperature sensor will though

evokiller666

oh ok im just thinkin that id be better off justs placing all the electricla stuff. its realy fustrating

unrivaled

usually the most overlooked problem with the running radiator fan is the relay under the hood. when its a cheap fix probably around $5.

evokiller666

oh well that would be a plesant suprise. a cheap fix i hope it solves the problem ill keep you posted when i get the port thanx for the help

unrivaled

another thing im not a 100% sure but i believe in the under hood fuse box the ac cooling fan and the radiator cooling fan have separated relays if so they are the same part you can also swap them to see if that solves your problem.

thewrai6th

The relays are not going to cause your fan to run after shutoff. The temp sensor (ECT) decides if it should turn on the fan relay or not. With older cars, the fan relays were hot at all times, meaning they could run the fan at any time, without any warning.

Sounds like you have a faulty ECT sensor that is coming on at a lower temp than normal. I've also never seen one run for more than 5-10 minutes after shutoff.
How does your temp gauge look after 20 minutes of driving?

thewrai6th

One more thing, does the fan ever turn off? It must shut off at some point, or your battery would be dead in a few hours.

unrivaled

evokiller666 if the relay is arcing then it would cause a closed circuit which will send power to the fan..heres a basic cooling fan diagram. the relay here is open. follow the positive wire going to the relay no power to the fan. but if the relay is fried and making contact well there you go. also in the pic you got the ect which can also be bad.

thewrai6th

If the relay were shorted and stuck on, it would never turn off...

teggything

this happens in my DA also. mine will do it even if i dont drive the car. if i turn the key to the on position and shut it off it still does it. what can i do to fix it? do i even need it really?

evokiller666

oh ok ill check it out .btw we pulled the ac out recently

unrivaled

there might also be i fan timer unit in the cabin..which controls how long the fan stays on..if you just give up and cant find out the problem you can unplug the fan and run it directly to your battery and then to a toggle switch inside your car. the black wire to ground near the radiator and the white wire to the toggle switch and from the switch to the battery. its simple,no headaches its how i got my prelude right now for a year with no problems.

evokiller666

yea it seams simple but i relocted my battery in the trunk. so its a real pain to run wires but i think ill do that any way because it's alot cheaper lol

unrivaled

alright then. if you figure out the problem post it up. good luck.

teggything

oil temperature switch for the fan circuit on DAs. its is on the back side of the motor. i need to know what it looks like so i can unplug it there r like 3 things there

thewrai6th

Instead of wasting your time running wires and switches (not to mention the possibility of forgetting to turn on your fan, NOT GOOD!) unplug the ECT switch and see if that is your problem. The ECT is not an expensive part and that is how your car was designed to work.

If you're going to have the fan on at all times, at least run it off of switched power (ignition 12V) instead of a switch.

evokiller666

now i have a wose problem the fan will only come on when i turn the car off.

91davtec

i have a 91 and i have that problem and i was told its a senson you can change to make it shut off wen the car shuts off

fullyeclipsed

a defective relay can cause this issue. have replaced one before to correct this exact issue. have u replaced the relay yet evokiller666? also check for a damaged wire.