cooling fan
 

hi everyone. i'm back with another problem.i have a 95 camaro 3.4. my cooling fan quit working. i've changed the relay and still nothing. after further investigation, i realized i'm getting no power at the plug. i have power in fuse box and have replaced the relay and still no power at the plug. i'm assuming something is wrong between coming out of fuse box to the plug. something in that wire. do you think my assumtion is correct. should i pull the fuse box and track that wire to the plug. what everyone think. thanks in advance.

yep get the voltage tester out an track it. if you haven't yet download a factory service manual. brb

go here to download your year manual. http://www.mediafire.com/?40mfgeoe4ctti

coolin fan
 

well i pulled the fuse box out and tracked the wire as far as i can. wire in great shape. see nothing wrong. don't know how to use volt meter.

get on youtube and do a search for using volt meter. also there is a fuseable link in the fan wiring that could be bad. looks like a lump in the wire. test for power on both sides of lump

First off, which "plug" are you referring to having no power at. The connector at the fan motor? If so, you will not have power there unless the fan relay is energized by the PCM. The PCM commands the fan On when ECT sensor shows the engine has reached a specified temp or if the AC is turned on. You've swapped the relay, so now you need to verify if the PCM is commanding the fan to run. When you say you don't know to use a voltmeter, I'm not sure you're going to have the skills to use the attached pages to troubleshoot your problem. Hopefully, the pages will help explain how the system should work and you can use the charts to go step by step through the process of checking the wiring from the PCM, through the relay and on to the fan.

coolin fan
 

thank you for the drawnings. i've been using them. peterpar, i'm saying i have no power at the plug. ok so this is where i'm at,i'm following chart c12 page 2.i'm on step 2. i've located ckt335. but don't know where b+ is or understand how to hook test light. i also read jumping across d1 and d4 should energize the fan. i did that and the fan came on. anyone know where this b+ is and how to hook test light uo. thanks....

What the drawing is referring to is hooking the test light to a positive battery polarity source and checking to see if the PCM is sending a ground to D2 of the coil of the fan relay to energize it. Checking between terminals D5 and D2 with a test light while the ignition is "ON"/Engine "OFF" and the AC "ON" should accomplish this test as long as you verified D5 was hot as in step 1 of the chart.

This indicates the fan is good and the circuit wiring that provides the power to the fan motor is OK. Your problem seems to be in the control circuit side of the fan relay coil.

coolin fan
 

you say the circuit side of relay. what should i do next

Have you done these tests yet? You need to verify 12V is being applied to the relay coil at terminal D5 and the PCM is providing a ground at the relay coil terminal D2. 12V between these two terminals will power the coil of the relay and then the relay will mechanically close the contact between D1 and D4 which allows the fan motor to run, just like when you jumper across those two terminals. When I said the problem seemed to be in the control side wiring, I was referring to the wires going to the relay coil terminals D5 and D2.

i failed to mention my ac don't work.so the tests where i have to have ac on, i can't do

coolin fan
 

i followed the wires going to d2 d5. there real little brown and green wires. they both go into what looks like that plastic stuff you heat up and it shrenks. could those possibley be in line fuses.

The test I'm wanting you to do is done with the ignition switch in the "ON" position and the engine "OFF" while the AC switch is "ON". The AC won't actually mechanically run because the engine is not running, but the AC switch will send an input voltage to the PCM and the PCM program should command the fan relay to turn "ON" by providing a ground to it's coil. What I'm not sure of is if the AC system is low on Freon, will the PCM still command the cooling fan relay on. You also haven't said if you tested to see if terminal D5 has 12V to a ground when the ignition is on. This provides voltage to the fan relay coil from fuse #6 and if this fuse is blown, the PCM could be providing a ground to the relay as it should and the relay will never energize because it has no power source to it. When working with electrical circuits, you can't assume things are OK and not verify them. If you do, you could end up chasing your tail trying to troubleshoot, only to find out what you assumed was your problem.
It's getting to a point where you're going need a scanner and somebody capable of operating it to continue to troubleshoot. You need to know what temperature the PCM is being told the engine is running at and if the PCM has commanded the fan to run. I believe the V6 engine dash gauge in 1995 uses a separate sensor than the PCM sensor, so the PCM sensor may be bad and telling the PCM that the engine temp is not warm enough to require the fan to come on.
As for in line fuse in the wiring, if it has, someone has modified the wiring and we would have a whole new ballgame.

coolin fan
 

peterpar: i i wanna thank you for trying to help me out. i think it's to the point i need to take it to my boys. i've never been good at electrical.i 'm just not smart enough to do electrical. it may be a couple weeks before i can get it in there. but as soon as i find out what's wrong, i'll get on here and let you know what the problem was. thanks again.

Don't feel like you're the only one who has trouble understanding an electrical problem, because most people today can't look at an electrical schematic and explain how the circuit works or follow it to troubleshoot from. We all have different levels of skills. I went through a four year electrical apprenticeship program and spent the last 40 years working as an electrician on industrial motor control systems which gives me a huge advantage over you.