purple ring coolant sensor resistance

blackturbo86 · Post by **blackturbo86** » Tue Jan 09, 2007 10:05 pm

Does anyone know the resistance of the purple ring coolant temp sensor? I found a place where I can get a good price on these sensors, but they have two listed for this car. If I can get the resistance, I can check it before I buy it and get the right one.

Post by **jkxr4ti** » Wed Jan 10, 2007 8:50 pm

http://forum.merkurclub.com/forum/viewt ... urple+ring

Check this post out. Ed posts an old imon write up on making a mustang sensor work. I have done this and can verify that it does work fine with the mods listed. I opted to use a single 1/2W 33 ohm resistor instead of the two 68 ohm resistors in parallel(which equals 34 ohms for those electrically challenged). I just put a layer of heat shrink tubing over the resistor and crimped a male and female barrel disconnect to the leads. After those are crimped on you can simply insert the resistor with connectors in series with the lead that goes to the temp sensor.

blackturbo86 · Post by **blackturbo86** » Wed Jan 10, 2007 9:46 pm

so what is the total resistance of this set-up? about 33-34 for the resistor, plus the resistance value of the mustang sensor. i can pick up this sensor for a couple dollars, no mods needed. i just want to make sure i get the right one

Post by **jkxr4ti** » Wed Jan 10, 2007 10:12 pm

Yes you can pick this sensor up cheap at any auto parts store. Most of the fords used this type. In fact if you go to most stores they will try to sell you the standard ford type instead of the merkur specific unit.

Yes, the total resistance of the series circuit is 33-34 ohms plus the resistance of the sensor which i cant remember at the moment.

blackturbo86 · Post by **blackturbo86** » Thu Jan 11, 2007 5:35 pm

well that doesn't help too much. anyone know the resistance on this one?

Post by **Ed Lijewski** » Fri Jan 12, 2007 12:43 pm

I'll make a note to measure it on my spare over the weekend, if no one else chimes in with the answer.

YMMV

Post by **Ed Lijewski** » Sat Jan 13, 2007 10:56 am

I measured my new spare purple ring sensor (bought from OPMD a year or so ago):

-- ~44 ohms at ~210F (boiling water); ~414 ohms at 60F.

My two used ones showed:

-- ~100 ohms and ~540 ohms, and

-- ~80 ohms and ~510 ohms at those respective temperatures.

HTH, and if it does, put me down for a sensor from your supplier.

YMMV

XR Tuner · Post by **XR Tuner** » Mon Jan 22, 2007 1:56 am

What is the part number for the Purple ring sender?

CV12Steve · Post by **CV12Steve** » Sun Oct 05, 2008 2:35 pm

Does anybody have the part number to that?

BoWzER · Post by **BoWzER** » Sun Oct 05, 2008 3:32 pm

http://www.partsamerica.com/ProductList ... ure+Sensor

That might help??? for the P/N?

xr4man · Post by **xr4man** » Mon Oct 06, 2008 8:33 am

the part number is yb0201. they are $4 from cosworth usa. $11 shipped.

these actually have the proper resistance range for the temp gauge.

and you get the added benefit of having genuine cosworth parts on your car.

Post by **DPDISXR4Ti** » Mon Oct 06, 2008 9:46 am

xr4man wrote:and you get the added benefit of having genuine cosworth parts on your car.

How much HP does it add?