Cooling fan Situation

[Volume_Civics]

My 94' HB dx started to overheat the last few days. I decide to see what the problem was. First I opened the hood and see if the radiator cooling fan turned on when my car was at operation temp. The cooling fan did not turn out. I unplug the cooling fan harness and jumped it to my battery. The cooling fan worked. So either it had to be a relay or fan switch prob. Next i switched the cooling fan relay with another relay (The rear defrost relay) I ran the civic and yet the fan still would not turn on. From there i assumed it was the cooling fan switch. I bought and installed a new one and yet the fan still won't turn over. Do you guys think it could be my thermostat that is faulty? when the civic is at operation temp the upper hose gets hot but the lower gets half as hot. any ideas?

[Copytech99]

Have you jumpered across the fan switch ??

[big tex84]

I had a friend that had the same problem, we couldnt figure it out, so he hooked the cooling fan to a switch inside the car and runs his fan from that.

[turtlecrxsi]

Not sure about OBD1 cars but to avoid headaches of wiring and switches, the crx fan could be turned on with the ignition by grounding the black wire from the fan motor to the chassis... just t-ed off. I've ran my car like this for over 3 years without issues.

[big tex84]

Originally Posted by turtlecrxsi

Not sure about OBD1 cars but to avoid headaches of wiring and switches, the crx fan could be turned on with the ignition by grounding the black wire from the fan motor to the chassis... just t-ed off. I've ran my car like this for over 3 years without issues.

good point, unless you have a high powered stereo, and the stock alt., thats the reason my bud didnt do it like that, but it will work really well with everything being stock

[mennouth]

OK cooling fan draws verry little current, it wont stress the alt even if you have a big sterio, now it will cause a buzzing sound, if the amp is not hooked up through a ground loop isolator, just as the older chasis cars the FM signal traveling through the body from a freayed antena wire will cause a humming in the subs, my recomendation is to refer to your service manual, and use a volt meter to see where the circut is broke, or just wire it to your ignition circut, and spen 45bucks on a ground loop isolator for the amps,"it will also protect against sending a surge through the amp system if the car has to be jumped"
if the sterio is big enough to make your headlights DIM when it hits, you need to add a seccond battery, or a deep cell like an optima, when your lights are diming that means that the alt is not putting enough power to the battery to exceed the amount bieng drawn from it, you will fry the alt and the batt.

[big tex84]

No disrespect, but when he turns the fan on in his car and he has the stereo going then the alt starts all kinds of whining and shit. and no its not like he has a bad alt, it brand new because the old one did it and he replaced it in hope of making the noise stop. Not everyone has 120 bucks for an optima, or switching for a high output alt.