Cooling fans

[85ha]

Where is a good source for finding the Ramcharger dual fan setup and what year models do they come on?

 

[novaderrik]

no need for dual fans- i have a single 16" Hayden fan that i found in the junkyard on my car and it never gets above 175. it is wired with a $15 Hayden relay kit that is controlled by the turbo tweak chip in the 87 ecm.

 

[BRAD_PADGETT]

no need for dual fans- i have a single 16" Hayden fan that i found in the junkyard on my car and it never gets above 175. it is wired with a $15 Hayden relay kit that is controlled by the turbo tweak chip in the 87 ecm.

X2 here. A large single fan works the same as the dual fans for alot less money. I have the dual fans which cost more and needed dual fan relays. Brad

 

[85ha]

I have the 87 ECM and TT chip. Where is the wire from ECM that i need to connect to for fan relay

 

[novaderrik]

you need to run a wire to the ecm- i had a chevy TBI harness laying around and took a wire of the proper color out of the ecm plug on that and ran it to the proper terminal on the ecm. i even went thru the hassle of running it in the harness thru the firewall for that extra oem looking install.
i think the ecm grounds out the relay, and the + side of the relay (not the heavy load wire that i have going to the back of the alternator, but the switching part of the relay) is wired either directly to the battery or to a switched source that is hot all the time.. i can't remember how i did it, but either would work.
i have the fan relay mounted on the passenger side fender next to the fuel pump relay. it almost looks stock.

 

[BRAD_PADGETT]

There is also an existing wire(not used) that the Caspers 84/85 electric fan converson uses to connect to the ECM. I can look up the instructions if you want. Save some time getting to the ECM. Let me know. Brad

 

[85ha]

yeah Brad that would be great. Let me know please

 

[BRAD_PADGETT]

The wire location depends on whether you have the digital dash or analog. On the Caspers Electronics web site they sell a Fan Relay Install Kit for 84/85, part number 102066. If you look at the "Instruction" button on this product description the detail of the unused wire to the ECM from the engine compartment is identified. I used this kit and it works great for a single fan. The dual ramcharger fans I added later overloaded the single relay. I had to add the Caspers dual fan relay kit as well. I would just get a single relay and single large fan and keep alot of money in your wallet. A single large Continental fan is another boneyard option that works very well too. Let me know if you have trouble finding the instructions. Brad

 

[novaderrik]

my car didn't have a wire going to the fan control terminal at the ecm. it really wasn't that hard to run the wire and cost me nothing.
i was going to just run it thru the same hole in the firewall that the water temp gauge capillary and oil pressurel ine is run thru, but i decided to do it all oem like and go thru the firewall grommet. it involved taking off the passenger side fender, but that wasn't as bad as i thought it would be.

another option is to just use a temp switch in the water jacket somewhere to ground the relay and turn the fan on at a certain temp. you can get the Hayden relay kit i used, and dig thru the books at NAPA to find the switch to activate it- the switch should be under $20.

 

[85ha]

Thanx for all the advice guys. Im going to order the fan relay kit from caspers and run one 16" fan. Also doing the f body rad upgrade. Any idea what temp ECM turns fan on at?

 

[BRAD_PADGETT]

My tt chip turns them on at 167 and off at 160. Brad