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Fattie 12-04-2012 09:47 AM

Cooling fan resistor , will my fan still work ?

this part on my fan rotted away to nothing , will my fan still work without it ?

Fattie 12-04-2012 09:59 AM

i think this resistor is only for cars with ac , i have removed the ac from the car. hope that helps

my_beautious_ZX3 12-04-2012 10:37 PM

that's a common issue on this forum; surprised you haven't seen it.

It's the low-speed half of the Focus's 2-stage cooling fan. Removing it reduces your cooling system to a one-speed fan that kicks on with the A/C or when the engine is on a trajectory to overheating. Of course, if your old resistor was already rotted away (open-circuit), then the fan won't even realize that you removed it.

If you haven't noticed this already, then you will start seeing the temp gauge creep over to the 2 o'clock position when you're sitting in traffic, at which point the 2nd-stage fan will kick on and the needle will creep back to 12 o'clock.

The added heat stress over the life of the vehicle certainly won't make the engine any younger, but from what I gather, many (most??) old Foci are on the road and completely unaware that their resistor died ages ago. (me)

xxMichaelAnthony 12-04-2012 11:54 PM

No fans will come on without the resistor. Mine has been bad for months. No fans! But, if you turn the AC on the big fan will come on for a little bit a couple times a minute.

my_beautious_ZX3 12-05-2012 12:28 AM

^sounds like there's more wrong with your cooling/electrical system than just a bad resistor.

xxMichaelAnthony 12-05-2012 02:46 AM

Electrical problem on the resistor side of the circuit. Both fans still come on during KOEO OBD test so its nothing in the fan circuit.

amc49 12-05-2012 11:13 PM

The resistor controls low speed on both fans. High fans come on bypassing resistor at 240+ degrees or around 250+ psi highside on a/c.

Car will run with high fan only but it's a backup, you'll toast engine if that fails, the double fan speed setup is an automatically backed up system unless you insist on running it half failed. Head gasket jobs are always cheaper than resistors right?

When my resistor failed I rebuilt it and connector for like $7-$8 worth of parts. The resistor coil itself does not go bad, only the connections.

Fattie 12-06-2012 11:31 PM

mine was solid rust , i poke it with my finger and it just fell apart. im going to get a new one , and i didnt even bother to put the fan back in , its been around 30 degrees or lower here latley and the temp gauge stays right below half , and i keep the heat cranked. I will be buying a new one in a few days. thanks for the help

Top-Ace 12-07-2012 12:26 AM

Dorman actually makes a kit for this problem (#902-219). Must be common enough that they decided to make a nice solution. Way cheaper then going the dealer route.

amc49 12-07-2012 01:40 AM

Look how big the rest of the fan system connectors are as compared to the resistor connection, the resistor connector is smaller, and right at a heated point from resistor itself. Gotta wonder how much that engineer's college education cost......

No wonder Fords catch on fire so much, just saw another news story on it again couple of days ago.

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