freq

iTrader: (6)

Looking to purchase a new fan clutch for an 88TII.
Both Mazdatrix and Atkins have the S5 Fan clutch but the S4 is unavailable.

Anyone know where I can get an S4 fan clutch?
Does anyone know if an S5 fan clutch can work on an S4?

driftxsequence

iTrader: (8)

Both are interchangable as far as I know. As in they will both bolt to your waterpump. I just looked up atkins, they sell the clutch by itself so I'm not sure if you can bolt the clutch to a S4 fan blade. If not I have a S5 you can have for next to nothing. I have 4 fans and all of them seemed to be bad.

misterstyx69

iTrader: (142)

I believe that here is a difference in the way that the clutch ,mounts to the Pump..so NO,you can't use the s4 fan on an s5,or vice versa,without changing the whole waterpump assembly and housing for it.

clokker

iTrader: (2)

It's not the mounting, the pumps are different.
The snouts are different diameters, can't recall which is bigger.

freq

iTrader: (6)

So does anyone know where I can get a new s4 fan clutch?

freq

iTrader: (6)

Is an S5 waterpump housing a direct fit/bolt-on to an S4 engine?

Rikk

iTrader: (2)

I may have a good used S4 clutch and fan if you're interested? Have you tried MazdaMotorsports? IIRC the WP housings(the fittings on the back) are different
GL Rikk

barkz

iTrader: (1)

I've got a low mileage one. 80k on it.

misterstyx69

iTrader: (142)

It is..(BUT just the S5 pump to the s4 housing is NOT as the bolt pattern is different..Look up JARED CARPENTER..thread)
But when you do that you go to that 3 bolt plastic Thermo neck..(unless you buy an aluminum upgraded one).The Filler is no longer on the engine(thermo neck had the flat filler cap on the s4).

freq

iTrader: (6)

Where in NH are you? Send me a text-- 781.343.15 twothree

This may hold me over until I can source a new S4 or S5 fan clutch.

lduley

iTrader: (1)

I don't believe you can buy the s4 NEW anymore as an assembly, only the clutch part like you found at mazdatrix

driftxsequence

iTrader: (8)

Why dont they work? I've bolted a 8 blade clutch fan and 11 blade clutch fan on my S4 car. as far as I know the 8 blade is s4 and the 10/11 blade is s5...both bolted to the waterpump pulley.

clokker

iTrader: (2)

I'll bet if you looked you'd see the ID of the large center hole differs between the two.

Clearly, since you've swapped them, the S4 waterpump has the smaller nose and the larger diameter S5 ID fits.
The reverse would not work, the S4 would be too small for the S5 pump.

jackhild59

iTrader: (7)

You can bolt an S5 clutch to an S4 water pump. You cannot bolt S4 to an S5 waterpump.
The S5 shaft (and clutch hole) is larger.

I think the fan is interchangable, but wouldn't swear to it.

The waterpump/housing is specific to the engine front cover. You must change everything-cover, waterpump housing, waterpump, thermostat cover, water outlet including the MOP to change one series to the other. Not worth it.

These guys have an S5 fan clutch. Ask for Mario.

Used Part Search

-Jack

driftxsequence

iTrader: (8)

Good to know. Thanks!

Dak

Maybe shouldn't suggest it since it wasn't the question but I will. For what that new clutch fan costs you could get a decent E-fan setup. When done right with a fan that flows enough cfm they work just fine.

lduley

iTrader: (1)

even better usually

freq

iTrader: (6)

A month or so back I set myself up with an efan. Temps were *slightly* higher than I preferred, but I chalked that up to having an fmic and missing the undertray.

A few days ago, pulled into the driveway and noticed that the temps were real high. Fortunately I wired up a secondary bypass switch that connects the fan directly to the battery and noticed the high temps b4 my engine burnt up.

The short of it is this.. I've done a bit of research, and it's debatable as to whether you can get an efan to flow better than stock-so I went with one and a Pettit switch/thermostat because it's cheaper than replacing/repairing the stock system and it frees up some space in the engine bay.

What isn't debatable is there are fewer points of failure using the stock system.

With the efan setup, you've got wiring, relay(s), switches, etc.

With the stock setup, you've got the clutch-that's pretty much it.

clokker

iTrader: (2)

A valid point but moot if the fan clutch is NLA.

I've run efans for years with nary a failure, most swaps I see are questionably installed and almost doomed to failure.

If you constantly obsess over the reliability of an electric fan, how do you live with the FI and ECU, both of which are riddled with potential failure points?

freq

iTrader: (6)

Your definition of 'constantly obsess' is flawed.

Quick background: I've run the car since 1998 on the stock fan.
Recently, when the stock fan went, I did some research and decided to go with the efan.
A few days ago when the efan system failed (more specifically, the relay failed) I've decided to go back to a stock setup.

Your mileage may vary, but according to my experience noted above:
Stock setup lasted 27 years.
Efan setup lasted 2 months.
If a new stock setup can be sourced and afforded, that's a no-brainer.

According to the above posts, it's $250 for an atkins S5 fan clutch that'll bolt to an S4 water pump. I'm about to test out that theory.

Re: the FI and ECU, they have both lasted far more than 2 months(try 27 years), so I've (somehow) been able to keep myself from *constantly obsessing* over those 2 items.

clokker

iTrader: (2)

So, one component of the efan system fails and you decide the entire setup is flawed and ditch it?
Did you consider a different, perhaps more robust, relay?

My mileage has indeed varied considerably from yours.
For seven years my efan system- all sourced from a junkyard for under $50- has never failed and outperforms the stock fan clutch in every way that matters to me.

Good luck with the new fan clutch.

freq

iTrader: (6)

I didn't say the entire setup was flawed because it's not. I said your definition of 'constantly obsess' is flawed.

I'm all for junkyard parts. My car has plenty.

Do I want to risk burning my engine up with a junkyard efan and a new relay/wiring?
Sure. I'll give it a shot. *ONCE*
I lucked out this time. Happened to catch it before the engine got really hot and cost me $$$'s in a rebuild.

Imagine if I simply replaced the bad relay and 2 months later the same thing happened, but this time I *didn't* catch it in time? Now THAT would be stupid.

Like I said, your results may vary. Seems to have worked out great for you over the past 7 years. Glad to hear. ..matter of fact, I've got a good junkyard efan if you need a backup ;-).

I'm gonna give the new S5 fan clutch a go. If you can afford the $250 and don't need the extra room in your engine bay, makes MUCH more sense.

Rob XX 7

iTrader: (8)

I agree with freq- its hard to argue the stock set up.
For the record I have an electric fan- it was my 3rd setup and honestly part of me wishes I just had a simple old fashioned fan still bolted to the waterpump.

everyone likes to think they got it figured it out and try to sway you to the electric fan setup, some people did get it figured out and posted results on this form- good on them. Doesn't mean you still cant put a stock one on there lol

clokker

iTrader: (2)

No, it's very easy, especially when the parts are either NLA or exorbitantly expensive.
With a (presumably) functional efan installed, why would you want to go back?
What about the stock setup do you think is better?

You make efans sound like rocket science.
"Some people did get it figured out"? You mean like every car manufacturer for the last 20 years? An efan is about as basic an electrical circuit as there is, other controls in the FC are far more intricate/delicate/failure prone (looking at you, switchgear) but those appear OK by you.

Rob XX 7

iTrader: (8)

I wont do the fancy dissect quote system like you did clokker- Ill just list my reasons.

First of all- I fully acknowledge that a electric fan can and will work fine when properly installed, wired, and controlled.
Its just not as easy and fool proof as 4 little nuts holding a fan onto the waterpump.

So actually thats my arguement for the simplicity of the stock set up- cant argue with me that its tough to beat 4 bolts. In about 20 minutes he can be up and running with what has been proven to last in the car for years and years. The most reliable FC's were when everything was newer and no one messed with them. 150-200k+ miles- tough to argue with that isnt it?

30 years later things show their age, things can be improved. Guys on here have documented in great detail how they got their fan set ups working. I applaud those guys for doing the leg work and sharing it with everyone.

Still doesnt mean a new fan clutch is a bad idea right?

as for "new cars" being controlled by electric fans yes you are absolutely correct they are, and a lot of engineering and ECU control goes into them. They are regulated by percentages, vehicle load, ac, etc. They are actually pretty complex I wouldnt discount the way a modern car controls its cooling fan so easily. Yes the big picture is something switches the fan on and off and that is not complex. The point is the car is engineered from the start and undergoes strict endurance testing.

first fan I put it in my car- brand new 4800cfm unit- drive the car somewhere- starts running a little warm- get to where im going and right then and there it let all its smoke out. Sure they warrantied it for me- but I could not move the car without going and buying another fan to get my through. I had that fan on there- didnt even cool that great. I put another fan- think the shroud is not that great even though the RX7 "specialist" who sold it to me swore it worked great for road racing. Guess driving down the highway was not tested lol.
So I break down and buy a brand new Taurus unit- motor is so tiny and looks so cheap I return it and buy a used Taurus fan. Motor is twice as big. Im a simple idiot I see a big motor with bigger wiring and to me that HAS to be better than that other piece of crap I bought.

So yes that has been in my car, and I stare at the temperature gauge CONSTANTLY. Something I NEVER EVER did with the stock fan. So when I say part of me wants to go back to stock- thats why it was simple, easy, and fool proof. Mazda got it right with the fan and shroud.