Author Topic: Electric fan mod (Read 15154 times)

gearheadE30 · « **on:** November 01, 2007, 02:18:28 PM »

I just got an electric main fan off of a 1994 volvo 840 turbo. The shoud obviously needs to be cut down to fit, but what is the best way to attach the fan to the radiator. Are the stock shroud mounts strong enough to hold the fan? I know I also need to get the aux switch from an m44 car and update the fuses, but is there anything else I need to do? Also, are shot (i.e. empty) stock fan clutches worth anything?

Jordan

tjts1 · « **Reply #1 on:** November 01, 2007, 02:30:18 PM »

I'm not sure how the 850 shroud looks (was it an FWD 850 or RWD 940?). The 940 fan is easy enough to cut down and make fit. I just used a couple of nuts and bots on the existing top lip of the radiator. Now that I think about it I realize that I completely forgot to attach it at the bottom. OOPS! The 850 shroud is slightly different shape but I'm sure you can make it fit. The fan itself is exactly the same.

gearheadE30 · « **Reply #2 on:** November 02, 2007, 06:11:26 AM »

Actually, the fan I have is the exact same as that one except the shroud shape is different. Mine also has a lip that should fit into the bottom mount of the stock shroud, so that should be good. Now I just need to figure out where to get the temp switch...

tjts1 · « **Reply #3 on:** November 02, 2007, 09:42:27 AM »

With this fan you can eliminate of electric aux fan in front of the radiator and run this fan off the existing relays. The low and high speed control are built into the fan motor (much more reliable than the bmw design) so you can just splice the wires together and it'll work. You will have to upgrade the low speed fuse to 10 or 15a and get the E36 switch.
http://www.pelicanparts.com/cgi-bin/ksearch/PEL_search.cgi?command=show_part_page&please_wait=N&make=POR&model=BE36§ion=ELgage&page=4&bookmark=24&part_number=61-31-8-361-787-M85
61-31-8-361-787-M85

gearheadE30 · « **Reply #4 on:** November 02, 2007, 01:49:03 PM »

Sounds good. I already upgraded the fuse, and i think the dealer has the switch for a reasonable price (amazing, I know.) I'll be taking the OE aux fan off, but how do you get to it without removing the whole font valence? Can you just slide it out from under the car?

tjts1 · « **Reply #5 on:** November 02, 2007, 02:38:24 PM »

I'm not sure if you can slide it out from under the car because part of the bracket holding it in place blocks it. Theres also a plastic cover that needs to be removed. I'm sure theres an easy way to get it done, I just don't know it. My solution was a bit ehhh... medieval.

I chopped it up and took it out through the grill piece by piece. You'll be surprised how heavy it is for such a small fan. The shroud is made of cast iron. Make sure you have the Volvo fan running reliably first.
When swapping temp switch, don't worry about draining the radiator. As long as you keep the radiator cap on and the engine is completely cold, the coolant will drip out slowly.
On the volvo fan:
Green = low speed +
Red = high speed +
Black = ground

dude8383 · « **Reply #6 on:** November 22, 2007, 05:37:02 PM »

Quote from: tjts1;37062

I'm not sure if you can slide it out from under the car because part of the bracket holding it in place blocks it. Theres also a plastic cover that needs to be removed. I'm sure theres an easy way to get it done, I just don't know it. My solution was a bit ehhh... medieval.

I chopped it up and took it out through the grill piece by piece. You'll be surprised how heavy it is for such a small fan. The shroud is made of cast iron. Make sure you have the Volvo fan running reliably first.
When swapping temp switch, don't worry about draining the radiator. As long as you keep the radiator cap on and the engine is completely cold, the coolant will drip out slowly.
On the volvo fan:
Green = low speed +
Red = high speed +
Black = ground

Hey, sorry to bring this back from the dead, but I have an m44 fan and I bought the switch that you mention above.

So here's my problem...

The temp switch has three prongs, one for high, one for low, and the other is a ground or power?

If the third one is a ground, then where does the fan get power?

Do I need to route power into each individual high/low wire?

tjts1 · « **Reply #7 on:** November 22, 2007, 09:15:11 PM »

The 3 wires are low, high, ground. Connect the low or the high to the ground and it should turn on. Does the fan run off the existing AUX fan wiring?

D. Clay · « **Reply #8 on:** November 22, 2007, 09:44:45 PM »

http://www.m42club.com/forums/attachment.php?attachmentid=1558&d=1190689822
Wiring diagram for existing fan. It has the temp switch and relay circuits laid out. I'm currently installing an electric puller to replace the fan clutch, shroud, and blade. I'm using the 80/88 temp switch to trigger a relay for the new fan. Also using the A/C low speed circuit to trigger a relay so that the A/C fan is on high speed when the A/C is on. My main consideration is moving a lot of air over the A/C condenser for hot Texas summers.
I have a question. The temp switch in the radiator comes on at 80C. Also at 88C. When the temp reaches 88C., does the 80C. side switch off? I ask because if that is how the switch works, I would need two relays. I wouldn't want a puller fan to come on at 80C and if the temp reached 88C., turn off.

tjts1 · « **Reply #9 on:** November 22, 2007, 11:45:23 PM »

The way these things are usually set up, is 80c relay turns on and stays on all the way through 88c. When the 88c relay is also on, it over rides the 80c automatically so the fan just speeds up at that temp.

dude8383 · « **Reply #10 on:** November 23, 2007, 10:57:58 AM »

Quote from: tjts1;38180

The 3 wires are low, high, ground. Connect the low or the high to the ground and it should turn on. Does the fan run off the existing AUX fan wiring?

Actually no...I will take some pics of whats going on in there.

The only wiring going to the switch is the wiring coming from the m44 fan.

Brown, Blue, Black Blue...

AND PICS:

dude8383 · « **Reply #11 on:** November 23, 2007, 01:53:26 PM »

pics attached.

agreen · « **Reply #12 on:** November 25, 2007, 01:27:26 PM »

how easy is this to do then,

so i need one times volvo 940 fan mount it behind the rad

what else do i need do i also need a temp or coolent sensor, do i already have one ?

do i need to change it or just re wire the coolent temp to the volvo fan ?

how do i remove the fan thats on the engine what pully do i remove aswell

basicall i ned a step by step giud pretty pretty please and a shopping list

thanks guys

and hello from engand

teamgtnfx01 · « **Reply #13 on:** December 02, 2007, 01:41:55 PM »

Quote from: tjts1;37017

I'm not sure how the 850 shroud looks (was it an FWD 850 or RWD 940?). The 940 fan is easy enough to cut down and make fit. I just used a couple of nuts and bots on the existing top lip of the radiator. Now that I think about it I realize that I completely forgot to attach it at the bottom. OOPS! The 850 shroud is slightly different shape but I'm sure you can make it fit. The fan itself is exactly the same.

lets see come pictures of that valve cover and the manifold i wanna do taht how did u get the stripes was it hard

George77 · « **Reply #14 on:** December 02, 2007, 08:17:51 PM »

It's not that fan a bit bigger ?And olso eats to much power and it's also too heavy ,much heavyer then your thermal clutch.From what I Know the plug for the fan it in left side somewere under de hi beam and behind the plastic cover,I mean in engine bay,and the colour are:brown =negative,Blue with black first speed and the third one it second speed

Author Topic: Electric fan mod (Read 15154 times)

agreen