Coolant Temperature Sensor. please help with part #
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Senior User
Joined: Mar 2006
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Coolant Temperature Sensor. please help with part #
I need a part number for the coolant temperature sensor for my 2000 F250 7.3L. The parts store keeps giving me the wrong one, and I am tired of making the 45 mile round trip, and installation, just to get another wrong one. So far, they have given me master pro 2-9371 and borg warner wt3058, and they are both wrong. The plugs fit, but the gage doesn't register. Please, if anybody has a part number for one that is correct, I will get it.
Background: Everything worked fine, but I changed the water pump, hoses, thermostat, etc.. for preventative maintenance. The old sensor was dropped on the ground and broke the plastic top. The old sensor still works fine using temporary wire clips, but the new ones always show stone cold. I put the sensors into a bowl of water (being heated) to compare resistance at different water temps, and the resistance on the original sensor is very far off the resistance of the new ones. Since the sensors look exactly the same, I don't know how to get the correct resistance values unless somebody knowledgable can help me with a part #.
Background: Everything worked fine, but I changed the water pump, hoses, thermostat, etc.. for preventative maintenance. The old sensor was dropped on the ground and broke the plastic top. The old sensor still works fine using temporary wire clips, but the new ones always show stone cold. I put the sensors into a bowl of water (being heated) to compare resistance at different water temps, and the resistance on the original sensor is very far off the resistance of the new ones. Since the sensors look exactly the same, I don't know how to get the correct resistance values unless somebody knowledgable can help me with a part #.
Posting Guru
Joined: Mar 2008
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From: West Tx
F5AZ12A648AB is the correct coolant temp sensor. You are more than likely being given the EOT sensor. Both thermistors, but with different resistance values. The F65Z100884AA is WRONG. Although plastic colors are not a reliable indicator, the gray sensor is the correct one. The correct sensor also has a tapered sensor on it, but I have seen EOT and ECT sensors with it. The EOT has an index mark further to the edge than the ECT. Good luck!
Cargo Master
Joined: May 2010
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From: Snohomish, WA
Parts Guy Ed....OEM Baby!!!!
Hope that helps
Thread Starter
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Senior User
Joined: Mar 2006
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Why not just order it from Ed? Looking at the price of $9.72 I think you have eaten that up in fuel by now, besides the OEM one will be correct!
Parts Guy Ed....OEM Baby!!!!
Hope that helps
Parts Guy Ed....OEM Baby!!!!
Hope that helps
Former Vendor
Joined: Jan 2006
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From: Seattle
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Senior User
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So, for my 2000 F250, the correct ECT sensor is F65Z100884AA, and the wrong one is 3F1Z12A648A. I don't know if there is a difference on other years, but at least I finally have a working gage again.
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Former Vendor
Joined: Jan 2006
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From: Seattle
F65Z10884AA IS WATER TEMP.
Typically a 12A648 is a coolant temp sensor but on the 7.3L the 12A648 is used for oil temp.
I should have checked for you, but everyone looked like they were all over it.
my bad.
Typically a 12A648 is a coolant temp sensor but on the 7.3L the 12A648 is used for oil temp.
I should have checked for you, but everyone looked like they were all over it.
my bad.
Posting Guru
Joined: Mar 2008
Posts: 1,104
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From: West Tx
Sorry the part numbers didn't work! I am glad you got it fixed though, but I am curious on the part numbers now because I have twice had this issue with the numbers being to incorrect sensors on my truck, just recently went through it as well... At any rate, glad you got it fixed!
Freshman User
Joined: Oct 2007
Posts: 32
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From: East Tennessee
2002 F-250 7.3L
Ordered Part Number F65Z10884AA from dealership, sensor fits in hole (beside thermostat) but the plug does not because the tab on top of sensor plug does not match up with a slot on the wiring plug.
The part number on the old sensor I removed from the truck is 12A648-AA.
Because I needed to get the truck on the road, I ended up getting a part from O'Reilly (BWD WT3058).
This one did not have the tab on the sensor plug.
Coolant Temp Gauge is working now, but now I am confused as my case seems to be the opposite of what you have described.
Lead Driver
Joined: Sep 2010
Posts: 7,793
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.....for me, it was the 10884-AA p/n. Went to the first dealership only for them to have the same temp sensor for both location, the grey tab 12a648-AA, which had a plunger-like sensor feeler. The 10884-AA had the cone shape sensor feeler. Went to another dealership, same thing, until he went to the water-pump section, and noticed a "label" saying WATER TEMP, which also said, "black" connection. Went ahead hoping, and pulled trigger for 12 buks. part showed up 2-hrs later, installed over at buddys' place, and the trip home, dummy temp gauge, holding perfect. Before, darn needle would fluctuate from dead C to a tad above the first line....
Cargo Master
Joined: Aug 2011
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RiffRaff lists part # as F65Z10884AA Coolant Temperature Sensor - Riffraff Diesel Performance
$40 for a temp sensor! That's absurd. Its just a thermocouple/sender.
STANDARD MOTOR PRODUCTS TS380 {#F65F10884AA, F65Z10884AA, SW5130} is only $7 at RockAuto, $9 on AMAZON.
Anyone know if this cheaper version works?
$40 for a temp sensor! That's absurd. Its just a thermocouple/sender.
STANDARD MOTOR PRODUCTS TS380 {#F65F10884AA, F65Z10884AA, SW5130} is only $7 at RockAuto, $9 on AMAZON.
Anyone know if this cheaper version works?
