Engine/Transmission (1994 - 1998) Coolant temp sensor

[JoshPeters]

OK guys... . I'm getting the run around here. I call the parts store, even the dodge dealer... . haven't called cummins yet... don't have the engine number available to me at the moment.



I ask for a coolant temp sensor... . they keep trying to sell me the intake air temp sensor. I tell them it's a 1 wire sensor, on the back of the head, NOT on the intake. Probably a 22-24mm socket size to replace it.



Can anyone tell me the part number for the coolant temp sensor?



I just got done studding/replacing the headgasket and I accidently broke it when I was trying to pull the head out of the trunk of a car. (pressure test) The truck runs great... ... I would feel much better knowing what the coolant temp is doing!



Josh

 

[rcelum]

Hi, By now, you have no doubt found out what you wanted to know but in case not, I recently replaced my Engine Coolant Temperature (ECT) sensor. The Mopar part number was 1-04720314 which I bought from a Dodge dealer at about $45. 00 and came in a "Genuine Cummins Parts" box. Mine went out at 161,250 miles on a 1995 BR2500 4x4 OEM 160 HP engine. My temperature guage began to fluctuate irradically and then give no reading at all. Replacing the sensor was all that was needed to get an accurate guage reading. The original Cummins part number (as best as I can tell from scrapping off the Mopar label) is 3920363. Regards. rcelum

 

[SLangone]

When replacing this sensor do you reuse the NPT adaptor in the back of the engine block?

 

[rcelum]

Coolant Temperature Sensor

When replacing this sensor do you reuse the NPT adaptor in the back of the engine block?

Hi, It's been a while since I replaced this sensor, but if my failing memory serves me right, the new sensor was an exact replacement for the old one and did not need any adaptors to replace it, just remove the wires from the old sensor, remove the sensor (don't remember the size socket) and replace it with the new one, using permatex or suitable high temperature sealant then replace the wiring connector(s).



Hope this helps.



Bob Celum

Henderson, Nevada

 

[RLHannink]

I broke my sensor too, when I pulled the engine out. Forgot to unclip the wire. Autozone wanted like 80 bucks for a new sensor that they'd hafta order, so I said screw it. Ended up putting the broken piece of the wiring clip back into the other piece of the clip, added some black tape, and it's been good ever since. 60K miles ago.

 

[SLangone]

I changed the sensor and I got rid of one error code but I still have P0118 as an error message has anyone fixed this problem?

 

[jimdavidson413]

I have the code P0118, coolant sensor, we broke the coolant sensor connector pulling the head to have it fire ringed and installing cumming marine valve springs. This is my sons truck, He is completing his Army AIT school-diesel mech, and will be home in two weeks on leave before he ships out. Would like to solve this problem before he come home.
Two questions:
1. One I cannot see the coolant sensor, does anyone have a photo of this things location?
2. The truck is burning coal heavy up to 40 mph. Does the coolant sensor have anything to do with the heavy smoke? The turbo hoses are not broke or cracked. Could the trany be stuck in third gear? Truck has suncoast tc3, billet flex and input shaft, 160 injectors-coaltrain,etc.
Dad

 

[jimdavidson413]

The truck is a 98 12v, auto, big tires and lifted. bty (coolant sensor and smoke)
Dad.

 

[BHaden]

I also broke mine while pulling the head to fix a RF coolant leak. It's at the VERY rear left corner of the head If it's the LARGE single wire version, mine was made by BWD (Borg Warner?). Part # WT 426. I got it at Kragen/O'Rielly for about $60. It was also... shock... . MADE IN USA!

 

[BHaden]

A related question.

After replacing the sensor my temp gauge reads the same as before I broke the original, which is VERY low. Given the minimal markings on the factory gauge it appears to be running at about 150-160 degrees which seems to me way too low to be efficient.

Is this a normal 12 valve condidiotn or do I have a thermostat that is faulty or too low a temp?

TIA... . Bruce

 

[rcelum]

I have the code P0118, coolant sensor, we broke the coolant sensor connector pulling the head to have it fire ringed and installing cumming marine valve springs. This is my sons truck, He is completing his Army AIT school-diesel mech, and will be home in two weeks on leave before he ships out. Would like to solve this problem before he come home.
Two questions:
1. One I cannot see the coolant sensor, does anyone have a photo of this things location?
2. The truck is burning coal heavy up to 40 mph. Does the coolant sensor have anything to do with the heavy smoke? The turbo hoses are not broke or cracked. Could the trany be stuck in third gear? Truck has suncoast tc3, billet flex and input shaft, 160 injectors-coaltrain,etc.
Dad

Looks like you got your answer. I replaced mine many moons ago due to getting an erratic temperature reading. I got my new sensor from a local Dodge dealer in Phoenix for about $45. 00. It's at the top rear of the head hidden down below the valve cover and has a single wire attached. Use a large socket (don't remember the size but maybe

1 1/8" to 1 14") to remove it and replace using a high temperature sealant. Don't have anything to offer about your question # 2. Regards.

 

[snappy]

The mechanical 12 valves came stock with a thermostat that fluctuated widely. I like them because you know just by watching them when there is a problem. So, if the 95 still has a stock 'stat in it, it is time to change it. I like the Cummins 'stat best as it is heavy/better made than any of the aftermarket ones I have seen.

 

[Missouri Mule]

jimdavidson413,the coolant sensor has nothing to do with the smoke.

Check turbo boots (piping) unless you have a high horse power torque plate on it.

Your AFC screw mite need to be backed off a few turns.

 

[jimdavidson413]

I just replaced the damaged coolant sensor electrical cable. This Cummings part number is 3929272, the price for this part is $25. 94, plus ship. The Cummings part number for the coolant temperature sensor is 3920364. The access to these parts is: 1. remove the two fuel filter upper mounting bolts. 2. Remove the fuel filter banjo bolt, to have at least some room to work.
When you contact your local Cummings dealer to order the parts, have your engine serial number, the ESN is a must for getting the correct parts, and the VIN number handy. The ESN number black tag/decal is located on the drivers side of the front left side of the engine.

Rob's truck: 1998 4x4, 291,000, 12v on 38's with 7" skyjacker, dual stacks, fire rings w/ Cumming 110# marine valve springs, 160hp Coaltrain injectors, 4000 rpm red line. Modified injector pump, FASS lift pump, Suncoast triple disk, billet flex and input shaft, valve body. kdp, BD stabilizer, auto meters, 12k # mile marker.