84 2.5 4 speed car, PO has messed with the fan rather than fixing it right, it's on when the key in the run position, gets quite annoying when trying to diagnose problems, how hard is it to install a manual fan switch? what wires should i tap into? also, what should the fan switch on the block have 4 resistance when the engine is cool?

The problem with answering this easily is that some '84 Fieros came with a heavy duty cooling system with a two speed fan and others came with a single speed fan. And then some had A/C and others not, and of course there was any combination or permutation of the two. They all have different wiring schematics so you'll need to tell us which one you have before we can help out. First, does the car have A/C? Next, check your RPO codes on the inner wheel well arch on the front driver's side under the hood. Look for RPO code V08 (heavy duty cooling). Then post what configuration you have.

i can tell you as i sit here the car did have A/C when she rolled off the factory line, doesn't have the compressor anymore. i'll look 4 that RPO code tonight after i get home from class...about 700 my time.

3 possibilites:

1. You have the 2-speed system, so this is normal.
2. There's something wrong with the fan switch or relay (always closed)
3. The P.O. already installed a manual switch and it's on.

As Bloozeberry said - you need to find out what you have first.

------------------

World of Wheels Winners
My 3.4L S/C 87 GT
& Super Duty 4 Indy

[This message has been edited by fierosound (edited 08-17-2009).]

If the car had AC then it has a two speed fan. Is the fan on low or high speed? If it's on low, it can come on two ways, by selecting AC on the climate control unit or when the engine temp reaches 220* as determined by the temp switch on the head. If the high speed is on, that happens two ways as well. The engine reaches 248* as per the same temp switch on the head (it's a two position switch) or when the pressure in the AC compressor reaches 400psi (I think that's the number).
Without looking at your car, my guess is that the fan is on the high speed and, because you say the AC was removed, someone removed the wires from the back of the AC compressor and one of them is pinched somewhere which will cause the fan to come on. I have seen this happen before.

damnit my 84 has A/C but i dont see the RPO on the parts list or whatever u called it

there goes my dreams of a perfect 84.... Sunroof, power everything, AC, but no RPO =(

[This message has been edited by redfieroman2 (edited 08-11-2009).]

I'm not sure if I have the same issue or not, but I can always feel a very slight breeze coming through my vents when I have evrything sealed up. Even when I have my fan set to completely off. Never thought much of it until now.

quote Originally posted by Shill: I'm not sure if I have the same issue or not, but I can always feel a very slight breeze coming through my vents when I have evrything sealed up. Even when I have my fan set to completely off. Never thought much of it until now.

I believe the original poster was talking about the radiator fan, at least I hope so because that's what I was referring to in my previous post. As for the ventilation fan, I don't believe it is ever off unless the OFF button on the climate control panel is off, regardless of the switch position.

the interior fan is never off unless you press the off button, it will spin very slowly when it's in the lowest setting and "on"


i am referring to the rad fan, it's a two speed unit i believe, because it seems to be spinning on high, it's seems to be spinning too fast to be on "low". i will look around when i get home later on today as far as the a/c goes, what color wires should i look for? i do have 2 wires just floating around on the intake side of my 'duke one is green, other is yellow


im not sure where the a/c compressor should sit, the mounts are nowhere to be seen so i believe they were removed when the engine was swapped. i'm finding more problems here and there with their install (timing was off, etc.) i'll take a look @ the car when i get back home, spent last night @ the blazer working on it as it's closer to my class & stuff. i'll look into it and post back, maybe by then someone will post where the a/c compressor should sit too...who knows lol.

thanks for the pointers so far +'s 4 every1

[This message has been edited by greasemonke50613 (edited 08-11-2009).]

quote Originally posted by TONY_C: If the car had AC then it has a two speed fan.

Are you absolutely sure there TONY_C? I don't doubt it's possible in '84, but I ask because the '86 service manual separates the fan circuits into three distinct configurations:

a. 2.4L with single speed fan, no A/C, no heavy duty cooling (V08) (uses one SPST temp switch and one SPST relay);
b. 2.4L with single speed fan, A/C, no V08 (uses one SPST temp sw, two SPST pressure switches, and two SPST relays); and
c. 2.4L with two speed fan, A/C, and V08 (uses one SPST and one SPDT temp switches, two SPST pressure switches, and one SPST relay and one SPDT relay.

If these were also available in '84, it's possible that Greasemonkey had A/C with a single speed fan.

OK, spending the day with the car, gotta get my quality time with her in. i'll look up that RPO code quickly and post up if i find it as thats the only other thing i needed to tell you guys

no heavy duty cooling, RPO V08

[This message has been edited by greasemonke50613 (edited 08-12-2009).]

quote Originally posted by Bloozberry: Are you absolutely sure there TONY_C? I don't doubt it's possible in '84,

According to the service manual for 84, non AC cars had one speed fan, AC cars had 2 speed fans. I know that the 84's I had followed this logic, I have had both AC and non AC 84's.

i'll let her cool off and have a look see @ the exhaust side, just got back from lunch and i'm not too fond of heat or getting burnt. (had heat stroke just a few times in my 20 yrs)

side note: it popped 42 on the way home from lunch. ran fine though, no hesitation or anything...

[This message has been edited by greasemonke50613 (edited 08-12-2009).]

quote Originally posted by greasemonke50613: alright, i checked the exhaust side of the engine for wires just hanging around and saw absolutely none.

If you disconnect the connector at the coolant temp switch, the one on the head, exhaust side near cylinder four, does the fan go off? It's a small rectangular connector with two wires on it.

[This message has been edited by TONY_C (edited 08-12-2009).]

i believe i've unplugged that one before to no avail

quote Originally posted by greasemonke50613: i believe i've unplugged that one before to no avail

well then, unless either of those two wires are shorted, the coolant temp switch is not causing the fan to come on. one wire is for low speed and the other is high speed. It has to be either the climate control in the car or the wire from the compressor, something is making a path to ground and turning on the fan relay.

bloozberry knows i hate wiring...knows how much i hate wiring...and i know nothing as far as what i'm doing with it. how should i go about testing to see if its going to ground? i think i know in my head but want to verify. just tap into a wire and ohm it to ground?

Before I spend a bunch of time scanning in the wrong wiring schematics, have a look at your coolant fan relay in the front compartment and count the number of wires running into it. There should be either four or six. Let me know how many and I'll know which drawings to post to help identify some of the wires dangling around in the engine bay.

assuming i'm lookin @ the right object (located in front of the drivers headlamp) there are 6 wires running into/out of it

Here's the drawings of the circuit you most probably have in your car. Go over them and try to match wire colors to be sure it's what you have. I'll explain the circuit operation tomorrow when I have some more time... right now it's pool time!

blooz, a pool sounds very good right now. i just got back from a relaxing bike ride. but at the same time, billiards sounds very good as well! didja get my PM about the headlight wirin harness by the way? i'll print these off and see what i find, i might as well just print out my entire Fiero 2 gig memory stick as well and place them in binders, might as well collect the complete set for all years too and have them on my book shelf...goal is to own one of each model of each year some day, and rotate thru them all so they all get driven!

wire colors are correct, only i dont see a brown wire anywhere, and there's a pair of light green/white wires

quote Originally posted by greasemonke50613: blooz, didja get my PM about the headlight wirin harness by the way?

PM sent

@ the fan relay. i'll take another look tomorrow in the daylight, heck i'll just take a pic of it and post it, just gotta get some daylight. found my charger for MY camera, co i should be able to get some halfway decent pics, my grandparents camera sucks. theirs is 5 megapixels, mine is 8

lookin @ the right thing, correct?



waiting on my camera's charger and i'll take better pics. my grandparents one is taking a dump finally. old as heck camera

[This message has been edited by greasemonke50613 (edited 08-14-2009).]

early afternoon bump

sunday morning bump/

Hey Greasemonkey,

I haven't got an '84 to confirm 100%, but that looks like what the fan relay should for the two speed fan. I'll get some time tomorrow to help you troubleshoot it.

alright. i appreciate it blooz, you seem VERY knowledgeable about these cars. great person to have on the board. i wish we could give people more than 1 +'s

quote Originally posted by Bloozberry: Hey Greasemonkey, I haven't got an '84 to confirm 100%, but that looks like what the fan relay should for the two speed fan. I'll get some time tomorrow to help you troubleshoot it.

You have a two speed fan and fan relay.

Let me know what the outcome of this is... I have a 1988 IROC that does the same thing. I have swapped relays, checked circuits and traced everything on the schematic to a tee. Fan still runs constantly, I have just lived with it for the last 14 years. (Gave up when everything checked out okay.) Really curious as to what could cause this.

It would be helpful when you take the better photos if you unscrewed the relay from the wall and took a picture of the bottom view of the relay.

Basically though, since you know the fan does work (you're just not sure whether it's on high or low speed), then, from the above schematic you also know that the red wire from the fusible link to the relay, and the black wire from the fan to ground are working. So that's two out of seven wires already troubleshot. You also know that at least one of the high speed or low speed solenoids in the relay are working or else it wouldn't turn on, so that means the wire that comes from the FAN E fuse to the relay is also good. Three down, four to go.

To puzzle out which of the two circuits is on all the time (high or low speed), you'll have to turn off the A/C control head (regardless if the rest of the system's been removed), unplug the coolant fan relay connector, and probe all the wires with green on them using a multimeter set on ohms. Put one lead on the wire and the other to ground, and note which wires show zero ohms. We can take it from there once you know this info.

i'll take better pics with my camera as soon as i get my stinkin charger in...paid 2nd day air shippin on it last thursday.... still not here... I'll also make sure to take the relay loose and snap a pic of the bottom of it, i'll run these tests later today, i have my motor mounts finally for my 350 swap in my blazer, so their getting painted etc. tonight, i'll look into the fiero while i wait for paint to dry, but pics wont be for a little while yet, till i get the charger for my camera in.


you want the plug on it or off it? screw it, i'll take both

[This message has been edited by greasemonke50613 (edited 08-17-2009).]

spaced this damn problem off lol.