Re: Even More Viper Fan Questions...

From: JAMEPC@aol.com
Date: Wed Aug 27 2003 - 21:51:51 EDT

On low speed the fan draws about +/- 22 amps and high draws about +/- 40
amps. Here is the link to a scematic designed by Bill N. that I used. <A HREF="http://home.comcast.net/~billnis/dakota/viperwiring8.jpg">
http://home.comcast.net/~billnis/dakota/viperwiring8.jpg>
I got all my parts from Waytekwire.com (also as per Bill)
3 Bosch High Capacity Relay#75011
3 Relay Connector #75280
bunch Terminals for relay connectors #31073
1 U-Barrel crimp tool #419 (this is specially made for u-barrel
terminals. Regular crimpers won't bend the tabs over the wire)

Hers's some additional parts Bill used from Waytek (I got locally)
46551 CIRCUIT BREAKER 50 AMP
23541 CIRCUIT BREAKER BOOT YELLOW
46041 MINI FUSE HOLDER

I tried Mopar relays but high speed blew them out.
I used 10 ga. for the power wires and 16 ga. for the relay control wires.

Hers's the link to Bill's mods to the fan shroud for his Gen III. My gen II
didn't need any trimming except a small part on the bottom and the water pump
stud cut off.
 <A HREF="http://home.comcast.net/~billnis/dakota/viperfan.jpg">http://home.comcast.net/~billnis/dakota/viperfan.jpg>

If you go to the DML archives and go to April 2003, select Author and scroll
down to Bill Nissley, you'll find more info than you'll know what to do with
and more scematics. A lot have to do with using a Saab temp switch (I have one
here for anybody that wants it). Also search by subject (Viper Fan) starting
in April 2003. I found V.8 to be the best for my needs and just installed an
on/off switch after the 10 amp fuse. This is the thermostat I used. <A HREF="http://store.summitracing.com/default.asp?target=search.asp&type=bykeyword&searchtype=both&part=painless+thermostat">Buy
Performance Car Parts at Summit Racing!</A> (PRF-30111). It's just the replacement
thermostat because the entire kit is not needed. You may want to consider #30110
(200 on/ 185 off) because with the 185 on/ 170 off thermostat, you'll never
reach 170 degrees for it to shut off so the fan runs continuously. Also Hayden
adjustable thermostats are a good option.

It's a fun project!
James

In a message dated 8/27/2003 7:08:16 PM Eastern Daylight Time,
bert59000@yahoo.com writes:

> Hi Everybody,
>
> Off hand does anybody know the amp draw on the Viper
> fan?
>
> Could someone share how to wire this baby in?
>
> What relay do you use? Where do you get the relay?
>
> Whose thermostat do you use to turn-on the relay,and
> where do you guys get it?
>
> Does anybody have pictures of their installation?
>
> James mentioned that his was wired as a two
> speed...how did you do that James?
> And how did you wire it so that it comes on with air
> conditioning?
>
> I am in dire need of a serious cooling fan,it has
> been in the 90's in IL the last few days,and my truck
> can't hang in this weather.
>
> The temp gauge has been over 220 all the time,and as
> high as 250-60 in traffic...
> Everytime I stopped and shut-off the truck yesterday
> the radiator cap was hooting and it was puking coolant
> out of the overflow bottle.
> After a few stops the truck couldn't cool itself
> properly anymore because of the reduced coolant
> level,and then on the way home,while moving at a
> decent pace(temp gauge near pegged),the computer shut
> down the air conditioning for about a minute or so.
>
> The radiator looks good,I don't see any build-up in
> it,and I can't find anyone who knows where I can find
> the towing/heavy duty radiator for my truck.
> Speaking of which,does anybody know how much
> bigger(capacity-wise) that radiator is(Bernd?)?
>
> I don't have a choice here,I've got to do something
> now,and the loss of drag and gain of HP will just be a
> welcome plus to the whole deal.
>
> Thanks in advance,
> Chryguy
>

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