Electrical 93 5.0. E-fans turned on than shut off. Whats wrong?

You didn't follow the instructions you posted in the other thread.

If you don't have a high current alternator, you can forget about using an electric 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-$170 See http://www.spalusa.com/store/Main.aspx?html=pwmv3. eBay will have the controllers for a bargain price: 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 high current load can burn up the typical cheap automotive switch very quickly. The fan draws 30 or more amps and you need to use #10 or #8 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.

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.
See my post at http://www.stangnet.com/mustang-for...-sooo-much-amperage-help.859590/#post-8645840 to get the drawings and full details.

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.

Unfortunately, the OP already purchased the radiator & fan kit from LMR.
The SPAL controller is a DC Control design patented by DCC & licensed to Spal.
Both are PWM (Pulse Width Modulated) also known as "soft start".
Brian (DCC owner, designer, fabricator, packer, shipper; he does it all alone) & I have the 1st 2 he built (FK-35), both are still going strong after 15 years.

Another good controller is the Flex i Lite https://www.flex-a-lite.com/accesso...roller-with-thread-in-temperature-sensor.html

It has a soft start feature and is fully adjustable.

No matter what choice is made. ALWAYS have the OFF temperature higher than the thermostat temperature. If not you could have a situation where the fan is running and the thermostat is closed. Now there is a waste of electricity, just loading up the alternator belt and you went swapped away from an engine driven fan for that very reason. It will also keep it from running on the highway.

Rt jam said:

...No matter what choice is made. ALWAYS have the OFF temperature higher than the thermostat temperature. If not you could have a situation where the fan is running and the thermostat is closed....

Click to expand...

Not true with DCC since sensor is at radiator outlet, whereas most others place it at radiator inlet.

What does the outlet location have to do with my reply?

The ACTUAL number is not important. The scenario you are looking to avoid is the temperature setting is so low that the thermostat is closed and the fan is running. To explain this to ones that don't understand I just advise to set the off temperature higher. When the thermostat is closed, the coolant is not flowing through the radiator so there is no need to run the fans.
Same situation with highway driving. The air through the grill will cool the radiator and the thermostat regulates. In the situation you don't need fan running either. On computer controlled cars, this is forced.

Rt jam said:

1. What does the outlet location have to do with my reply?

2. The ACTUAL number is not important.
3. The scenario you are looking to avoid is the temperature setting is so low that the thermostat is closed and the fan is running. To explain this to ones that don't understand I just advise to set the off temperature higher. When the thermostat is closed, the coolant is not flowing through the radiator so there is no need to run the fans.
4. Same situation with highway driving. The air through the grill will cool the radiator and the thermostat regulates. In the situation you don't need fan running either.
5. On computer controlled cars, this is forced.

Click to expand...

1. Everything
2. Numbers are important. Thermostats set the lower temperature limit & have a fair amount of hysteresis, 5-10 deg. between opening & closing.
3. True.
4. True.
5. ???