2 speed Merc Sable fan How To??

[Guest LIghtningZ]

O.k. fan in hand tried looking in the search forum couldn't make heads or tales of the posts somebody help this poor IDIOT wire this thing i would like to use a thermo switch, dash switch and an indicator light i know that Pete P., Lone and others have used the 2 speed Taurus fan. BTW are you guys using both Hi & Low speeds and if so why and how . this fan is going to be used on the stock Z for now since i have it in my hands but i also hope to put it to use when i drop in the V8 Big THANX you guys

[Guest LIghtningZ]

Come on guys i'm startin to feel like Major Tom with out his ground control... Hello Hello Hello is there any body out there??

[Guest Anonymous]

Sorry dude, didn't check this post earlier. No I'm not using the low speed fan at all. I see no reason to do so, but if you were wanting to, you need to talk to Pete 'The Relay' Paraska, he's the relay answer man.

The reason I don't see the need is because while the fan cools very well, I don't see a time where it would cool so well that the temp would drop enough to even turn the low speed fan on. Perhaps in the winter.

I've heard someone say that running it on high will burn it out, well I can only say mines been that way for a 1.5 years and it still works fine.

Go to your local speed shop or warm up your computer and head to jegs/summit racing and order a thermostatic switch. Put in in the water jacket wherever you can on the manifold or on the side of the drivers side head.

Wiring it, sorry man its been a while, but I recall a black yellow and a black orange wire and a ground (and mines taped up so I can't see it at the moment), I simply jumped the black wire to ground on the battery and then touched either wire to find which one was high speed.

I used one relay to put big battery power to the fan, which seems to work fine. Hope that helps, good luck with it.

 

Regards,

 

Lone

[Guest LIghtningZ]

Muchos Grassy ass Lone!! Big time help, now im really sorry i missed you in Rio vista, i wanted to go to the picnic (Norcal meet) but couldn't (i was also told it was in Sacto !!) i cant belive i drove right thru Rio that day !! Once again big thanks Lone and belive me when i get the chance again i wont miss you!! P.S. What happened to the MoHawk!!

[pparaska]

Sorry I slipped on this little task - been working about 70 hours a week lately - and my memory stinks!

 

My fancy-smancy relay circuit is all for nought. I have the fan come on high if the fan switch says the engine is hot, and also if the A/C is on.

 

Use a thermo switch (like the the JET-60601 from Summit racing) in the water passage of the intake or in the cylinder head (I prefer the intake).

 

Like Lone said, just use high speed. I've been using mine on high only because low doesn't seem to cut it in the present heat. Plus you want to wire it to run high if you have A/C and turn that on.

 

So it's pretty easy - get two 30 amp relays and run them in parallel:

 

- Have the fan switch activate both relays

(the fan switch is grounded. Connect a 1 amp fuse to 12V positive and run that to one side of each relay coil. Connect the other side of the coils to the tap on the fan switch. You can use #16 wire for all this.

 

- Run a #12 or #10 wire to the arm of each relay from a 50 or 60 amp Maxi fuse connected to the alternator output

 

- Run a #12 or #10 wire from each NO contact on the relay to the high speed winding terminal

 

- Run a two #12 or #10 wires (in parallel) to a good ground.

 

The reason for two relays is that the typical VF30 relay only handles 30 or 40 amps. Running 35 amps through one of these is testing it's capacity too much, IMO. Therefore, run two in parallel as I describe above.

 

Hope that helps,

Pete

[Guest LIghtningZ]

Cool,(PUN intended!) thanks Pete and Lone hey, Pete I spent about $15K at Wyo Tech and they never taught me how to wire a RELAY !! so can i play dumb and ask for a picture and diagram Any help is greeeeaaatly appriciated!!!

[pparaska]

Get a good 4 pin relay (VF30 or VF40) from an auto parts store or Radio Shack. It will be marked at the terminal connections with the following numbers, 85, 86, 87, 30 (and possibly 87a).

 

85 and 86 are the relay coil.

30 is the "arm" contact of the relay

87 is the Normally Open (NO) contact

87a is the Normally Closed (NC) contact

 

Run a power wire from a fuse from your fuse box that gets "hot" when the key is turned to the

on postion. Run this wire from the power side of the fuse , that way you're not adding to that fused circuit. Run that wire to the number 85

terminal on the relay (one side of the coil). Run a wire from terminal number 86 (other side of coil) to the terminal on the fan switch. Since the switch body is grounded and it forms the other contact of the switch, the circuit to the relay coil is now complete.

 

Run a power wire from either the battery, the alternator output or the feed side of another fuse and run it to terminal number 30 (arm) on your relay.

 

Run a wire from number 87 on the relay to the high speed terminal of the fan. Connect another wire from the common wire on the fan to ground. With this setup; terminals 85 and 86 act as a switch and connect terminals 87 and 30 together which sends power to the fan.

 

To run two relays in parallel, just run wires from terminal to terminal on a second relay. IOW, from terminal 30 on the relay above to a second relay's terminal 30, and so on.

 

Hope that helps