Dual Contour Fans

They are only 1 speed. They flow plenty of cfm, but suck alot of amps. The MarkVIII fan is by far the highest flowing. I am suprised that the contour fans are not keeping up. Is the rest of your system in good working
order?

Joe

Do you have the fans wired through a relay? You don't just have them wired directly off a switch, right?

I would also ask for more info on how the system is wired up? Does each fan motor and/or speed have its own relay? Was sufficient wire gauge used?
Did the system ever function decently in 100* heat or is this the maiden test?

^^^^ I would like to know as well as I am about to wire up my MarkVIII fan

elarm1 said:

^^^^ I would like to know as well as I am about to wire up my MarkVIII fan

Click to expand...

What's your question or concern? The Mark VIII wiring is different but simple...........

^^A link on how to install one would be perfect!!

elarm1 said:

^^A link on how to install one would be perfect!!

Click to expand...

If you just want to wire it up with a switch and relay so you can turn it on manually, you'll need an 75-80A relay for that fan. Wiring up the relay is easy. Plenty of diagrams on the net of how to wire an automotive relay.

elarm1 said:

^^A link on how to install one would be perfect!!

Click to expand...

One method:

http://home.comcast.net/~smithmonte/Auto/MarkVIII_Fan.htm

If you don't have a high current alternator, you can forget about using the fan. The stock 65 amp alternator on 86-93 Mustangs isn't big enough to run the fan and the rest of the car. If you have a 94 or later Mustang, the stock 3g alternator should be fine if it is working correctly.

Switching a fan on and off manually is a bad idea. Too many guys have been distracted (hot girl kissing on their neck, too much to drink, dog tired and not thinking clearly) and cooked things because they forgot to flip the switch. An equal number have forgotten to turn the switch off for the same reasons and run down their battery.

The best fan controller available today is a DC Control unit. www.dccontrol.com. Cost is about $???. Be prepared to wait 4 weeks or more to receive your controller once you have sent in your payment. The controllers are custom made in small lots and lead times can stretch out.

Next best is a SPAL controller - $70-$90 See http://www.spalusa.com/fans/automated/accessories/fanpwm.html. eBay will have the controllers for the $70: do a Google search and see what you find.

At the bottom are the Hayden or Imperial controllers available through Advance Discount Auto Parts and AutoZone. The non adjustable one is about $30 ( Hayden 226206) and the adjustable one is about $60 (Hayden 226204). I recommend you do a Google search on Hayden and the part number for more info.

Do not use a simple on/off switch without using a relay. The current load can burn up the typical cheap automotive switch very quickly. The fan draws 30+amps and you need to use #10 wire on the fan power and ground wiring.

If you are good with electrical stuff (90% of the people here aren't), build your own controller. The numbers on the diagram (#86, #87, etc) refer to the numbers on the bottom of a typical automotive relay.



Note that the temp sensor in the diagram needs to match the thermostat in your engine. The preferred arrangement is to have it open about 5 degrees above the thermostat.

To allow the ignition switch to control the fan so that it does not run when the ignition is off, connect the relay contact #86 to the red/green wire on the ignition coil or to the red/yellow wire on the coolant level sensor.

If you are an experienced electronics tech or electrical engineer, email me and I will send you the prototype drawings of a fan controller that is similar in function to the DC Control unit. It is a build it, troubleshoot it yourself item. I will not build or troubleshoot units, so it is not suitable for anyone who isn't really good with electronics.

Alternate placement for a temp gauge sender or temp switch/temp sensor for an electric fan. Use the heater feed that comes off the intake manifold. Cut the rubber hose that connects the manifold water feed to the heater and splice in a tee adapter for the temp gauge sender. Be sure to use the same water feed line as the ECT sensor. That way you will get the most accurate temp readings.

Tee adapter info:
Make a pilgrimage to your local hardware or home supply center and get some copper pipe and a tee that fits the temp gauge sender. Solder two pieces of copper pipe onto a copper pipe tee with threads in the tee part. Find the correct brass fitting to match the temp sender threads to the tee fitting.