Fusible Links & Cooling Fan

[Faustus]

Guys & Gals, need some serious help here.

Car 1991 Camaro RS
305 TBI
Auto
150,000 miles
Single Fan Set Up
Bought Car w/ 19,000 miles - Complete Stock and Still is.

I am having the cooling fan problem. I have read thru a million post. I have replaced all the relays (I think, The 2 behind the brake, drivers side & the one by the AC), new thermostat, thermostat sensor & all the sensors on the block, checked the fuse in the fuse box and even replaced the fan motor. I guess Im down to the Fusible Links. When I turn on my AC in this car the fan is supposed to come on, it stoped even doing this, I found the burnt fusible link for this, this one should be easy to replace (right next to battery, in this wiring clump).

But still cannot get the fan to engage on Its own (@ temp).

Can anybody PLEASE tell me the locations of the fusible link for the fan. I replaced the fan switch awhile ago, maybe 1 year, is there anyway I can still check this switch (the one on pass side below # 6 & #8 I believe.

Mechanicaly I have no problems moving around a car, but electric is another story.

Please, I really need help.

I do see 3 fusible links at the starter ? Any other suggestions ?

Thanx.

[rafman]

Yeah it's near the fuse box in your car. Mine is even labeled "blower". Hope this helps.

[Genopsyde]

I had the same problem, i replaced the temperature sensor underneath, and it started to work again, then it quit again, it was the motor, it worked for a bit, quit again, it was the relay, replaced the relay, and it blew immediately, check your relay again, bet ya it's blown again, so i had to just run a direct line from the fan, to the battery, and to a switch inside the car, therefore i hafta operate the fan manually.

[rafman]

Originally Posted by Genopsyde

I had the same problem, i replaced the temperature sensor underneath, and it started to work again, then it quit again, it was the motor, it worked for a bit, quit again, it was the relay, replaced the relay, and it blew immediately, check your relay again, bet ya it's blown again, so i had to just run a direct line from the fan, to the battery, and to a switch inside the car, therefore i hafta operate the fan manually.

Really! hahahaha, that's funny.

[Genopsyde]

why???

[RABarrett]

Electronic and electrical devices require two components to operate... voltage and ground. If one is missing or incorrect, the device will not operate properly. An electric motor, for example, will draw most of its current at start up. The slower it operates, the more current it draws. Any restriction to rotation will add to the draw, eventually blowing the fuse or burning a fusible link. When the motor dies, the extra current draw damages any control device in its way, including the relays, wiring, switches, etc. The relay is controlled by the ECM, which sends a ground to the relay coiul, creating a magnetic field to close the contacts. The closed contacts sends voltage to the motor, starting the fan. Using a volt meter, it is necessary to look for voltage drops, in either the power or ground side. If the relay closes, the problem is easier to solve. The circuit's operation will allow you to determine where to begin. The chain of events described in the queries results from not understanding the operation of the circuit, whic is understandable. You must first understand what you do not understand before you investigate. I would be happy to walk anyone and everyone through a problem such as this. Ray

[89IROC&RS]

YEAH RAY!! spot on, but i gotta give faustus some props here, for someone who claims not to understand electrical systems, did a pretty damn good job so far, but i know from experience, i work on electrical problems at the dealership, they are a pain in the ass. but yeah sounds like you have a short somewhere, like a chafed wire or something that is spiking the voltage, and it blew your relay again. ill see if i can find the wiring diagram for the cooling fan system and if you PM me your email address ill email the pic to ya. might help ya a bit. and ill see if i can highlight some areas that could be a problem spot. youll probly wind up having to chace the wiring harness all the way round the block and inspect the whole wiring system for rub throughs and burned or broken wires. seeing as youve replaced just about every hard item in the system i would say its a wire problem somewhere.