schamran

How can I make it turn on when the AC is on, and/or when the coolant temps are high!?

Thanks!

Gots_a_sol

http://www.dakotadigital.com/index.c...rod&prd641.htm

That'll do it.

Here is another http://www.dccontrol.com/fancontrol.htm

Onemoparnut

One thing to keep in mine is that the compressor clutch is hot all the time and the ground is switched to engage it. Not all fan controllers are set up to accommodate that setup.

Gots_a_sol

a simple relay can make it work though, so not a lot to worry about there.

schamran

Good call. Thanks for the ideas!

Onemoparnut

I used a relay to run mine also its not a big deal at all just worth a mention.

Jim Lane

Both of my condenser fans automatically turn on every time the A.C turns on, no user interaction is required, it took 2 relays and 2 diodes for automatic control.

Jim

schamran

I was waiting for your post Jim! Do you think there is a way to have it turn on with AC and when the coolant temp is high? I was planning on replacing the stock fan with the electric one since there is no more room between the intercooler and the grill.

Bogie

The fan controller I used is from flex-a lite its a cheap adjustable it triggers a relay and has a terminal for a switched ground override I used a second relay tied into the A/C system to trigger it. so yes it can be done.

kellypckp

I am getting ready to do the samething.

2 relays

Battery to both commons (30)

AC - use one relay and tie into one of the wires going to the compressor to one side the coil (85). tie the other wire into the other side of the coil (86) of the relay. running the relay in parallel with the compressor.

I used a cheap temp sensor dont around 180 on of at 160 I believe been years.

Temp - So but the battery to one side of the coil (85) and the other side to the coil (86) to the temp sensor

now connect the fan to the normally open contact of both relays (87) and the other side the the fan to ground. dont forget to fuse it.

any way that is how I will do it.

Gots_a_sol

Here is how I have my fan running in my truck now.

Low speed comes on with the a/c and when the truck gets hot enough to flip over to high speed, it shuts down the low speed circuit. (I think the temp switch cuts on at like 190 or so, I had to drive around a while then let the truck sit and idle forever to get it to turn the fan on so I could make sure the stupid thing actually worked like I wanted it to )




I think I spent more time making the schematic than actually wiring the truck

a/c clutch switch is just the 2 wires that go to the clutch on the compressor. I just piggy-backed off them to get the signal for the relay.

schamran

Awesome! Well apparently I lost interest in this for like two years... but do you know how much aperage this fan draws on each speed?

Jim Lane

From what I have read, the fan draws a bit over 40-amps on High Speed and has an inrush current of around 130-amps (startup)

If I were to install it in my truck I would use a 75-amp Bosch Power Relay to control the motor, be careful using 30-amp relays, they would work for awhile but eventually you will either melt them or weld the contacts and have a fan you cannot turn off.

Also use a diode across the coil to keep from burning your controller contacts.

I would also use the correct sized fuse link to protect the motor, it will handle the startup better than a fuse.

There is a lot of information out there on these conversions.

http://www.fordmuscle.com/archives/2...cfan/index.php

Jim

crazzywolfie

i wonder if the dual electric fan setup off a dodge caravan would be able to pull enough air for a cummins. i know for my little 318 they work great and can keep it cool even if i just have 1 fan running. they only pull about 10 amps per fan plus whatever they pull at startup but from the factory they only have a 40 amp fuse.

jimlj

Hey Gots a sol, Whats the purpose of the two relays in parallel? Looks like you only need one.