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david craig
david craig, Auto Mechanic
Category: Ford
Satisfied Customers: 879
Experience:  owner/mechanic at 3D Automotive
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Temp gauge dose not work it did before it broke sender got

Customer Question

Temp gauge dose not work it did before it broke sender got two from auto zone no work one from Napa no work then I got one from ford no work if I jump the wires it pegs hot
JA: Have you checked the coolant? Have you noticed any leaking?
Customer: New motor all new fluids
JA: What is the model/year of your Ford?
Customer: 01 f 250 4 x4 7.3 powerstroke
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Yes I do all my own work well I went to auto zone and tryed two sensors no work then got one from Napa no work then went ford got one no work jumped the wires at connector the gauge pegs hot
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 2 months ago.
Category: Ford
Expert:  david craig replied 2 months ago.

Hi Im David, what do you mean when you broke sender? trying to remove it?

Customer: replied 2 months ago.
when tryed to remove sensor from the pump it tell apart
Expert:  david craig replied 2 months ago.

and you were replacing it because the gauge didnt work?

Customer: replied 2 months ago.
No I built a new motor new water.pump etc it worked before I broke sensor
Customer: replied 2 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  david craig replied 2 months ago.

and when you jump the connector the gauge pegs, which is ok. pull the sensor and put a heat source on it.

Expert:  david craig replied 2 months ago.

by the way, i dont set the charges for phone calls.... thats the site doing that

Customer: replied 2 months ago.
No phone call just payed $ 28.00 no answer yet motor is warm 180deg
Expert:  david craig replied 2 months ago.

and the temp gauge is reading what?

Customer: replied 2 months ago.
Cold
Expert:  david craig replied 2 months ago.

the temp gauge is reading 180?

Expert:  david craig replied 2 months ago.

like pegged cold or under mid gauge a bit?

Customer: replied 2 months ago.
Does not move cold or hot temp I hot from thermometer
Expert:  david craig replied 2 months ago.

ok.gimme a few

Expert:  david craig replied 2 months ago.

pull the sensor out disconnector the sensor put an ohm meter on the sensors contacts. observe the resistance on the meter and heat the sensor up and the resistance should change drastically when heating it up or coolong it down

Customer: replied 2 months ago.
set ohm meter to auto m ohm cold 25.78 hot approx 145.ohms are 15
Customer: replied 2 months ago.
on k no reading
Expert:  david craig replied 2 months ago.

it should just be set to ohms.

Customer: replied 2 months ago.
ford sensor hot or clod reads 0 napa and auto zone all the same
Expert:  david craig replied 2 months ago.

so this one is reading correctly. as far as resistance.

Expert:  david craig replied 2 months ago.

did you maybe damage the connector? do a pull test on the wires, make sure they dont pull out.

Customer: replied 2 months ago.
No when I jump conector it's works gauge go to hot
Expert:  david craig replied 2 months ago.

is the coolant system full to where the sensor is immersed?

Customer: replied 2 months ago.
new rotellla elf full sensor is in top of water pump
Expert:  david craig replied 2 months ago.

is the thermostat opening/closing?

Expert:  david craig replied 2 months ago.

something is very strange here

Customer: replied 2 months ago.
Don't know what you mean tstat works
Expert:  david craig replied 2 months ago.

is the hose going to the tstat getting hot after the engine warms up. is it opening and closing at the right temps.ect.....

Customer: replied 2 months ago.
no over heat just no gauge reading. New motor it's killing me can't see temp
Expert:  david craig replied 2 months ago.

its gotta be a wiring issue. or a fuse

Expert:  david craig replied 2 months ago.

im looking at a few wiring diagrams now.

Expert:  david craig replied 2 months ago.

heres 2 prints with the sensor on them

Customer: replied 2 months ago.
is the sensor a variabie resister all the wiring ohms out
Customer: replied 2 months ago.
if i have bad wiring or a fuse problem why does the guage go to hot when term are conected
Expert:  david craig replied 2 months ago.

because you are going to a direct ground

Expert:  david craig replied 2 months ago.

its a thermistor. so yes a variable resisitor.... ohm each wire to ground.....

Customer: replied 2 months ago.
yellow to gnd 62.5 ohms red wire 0 ohms to gnd
Expert:  david craig replied 2 months ago.

ok. hang on a sec

Expert:  david craig replied 2 months ago.

ok you're reading through the cluster on the red. any way you can disconnect the cluster? then read the red to ground? or did you do that already(disconnect the cluster)

Customer: replied 2 months ago.
you mean the harness conector motor to firewall aka idm-ecm
Expert:  david craig replied 2 months ago.

that'll work too

Expert:  david craig replied 2 months ago.

should be connector C138

Customer: replied 2 months ago.
what should be connector 138 the main motor or temp sensor connector
Customer: replied 2 months ago.
or you mean pin
Expert:  david craig replied 2 months ago.

The connector on the print is labeled c138. thats not important because its probably not labeled on the connector. its just for identification purposes.

Expert:  david craig replied 2 months ago.

the easiest way to do this is to go inside the truck and remove the instrument cluster and remove the connectors for it so you can do a continuity check from the cluster connector to the temp sensor wiring.

Customer: replied 2 months ago.
ok and what am i looking for
Expert:  david craig replied 2 months ago.

when you read the 62.5 ohms on the red wire, you didnt have the other end, wherever that wire runs to disconnected.

Customer: replied 2 months ago.
red showed 0 yellow showed 62.5 ohs to gnd
Expert:  david craig replied 2 months ago.

i know. yellow shouldnt read anything. it should be infinite or OL on the meter. so when you get the cluster out and disconnected, you will be looking for connector 250b(probably the middle one if there are 3 connectors, position 8 redwire with a white stripe. once you find it, do a continuity test from that wire to the temp sensor red wire.

Customer: replied 2 months ago.
according to diagram yellow is gnd
Customer: replied 2 months ago.
yellow with red strip gnd right
Expert:  david craig replied 2 months ago.

correct

Expert:  david craig replied 2 months ago.

the other one is red/white stripe (power)

Expert:  david craig replied 2 months ago.

hows it going?

Customer: replied 2 months ago.
red with white strip insterment plug to senser 0.2 ohm and bepper is going off
Expert:  david craig replied 2 months ago.

well the reading is good. not making sense. you shouldnt have a problem. everything is checking good.

Customer: replied 2 months ago.
tested red wire to ground nothing also to yellow nothing
Expert:  david craig replied 2 months ago.

what?

Expert:  david craig replied 2 months ago.

you have to have a ground on yellow. when you say nothing, do you mean the meter is reading OL or 1.

Customer: replied 2 months ago.
i went red and white to ground 0 ohms went red and white to yellow red 0 ohms
Customer: replied 2 months ago.
can i be geting bad sensors they ohm out at 0 ohms hot or cold
Expert:  david craig replied 2 months ago.

if you are putting the meter leads on the temperature sensor. connector not on it. just the leads clipped to the contacts inside the sensor, and the resistance isnt changing with the temperature of the engine. then its a bad sensor

Customer: replied 2 months ago.
i am putting the leads on the sensor not on plug or wires
Expert:  david craig replied 2 months ago.

and the resistance isnt changing? bad sensor. just make sure the leads arent touching each other when on the contacts. if they arent, they yes the sensor is bad

Expert:  david craig replied 2 months ago.

thats crazy as heck that all these sensors are bad.

Expert:  david craig replied 2 months ago.

any update?

Customer: replied 2 months ago.
Well Ford sold me the wrong one but it still don't work they want 500. To check it out it's a rip
Expert:  david craig replied 2 months ago.

it has to be the sensor....wtf

Customer: replied 2 months ago.
For shits and giggles I will get a new connector today. And try that
Expert:  david craig replied 2 months ago.

ok...

Customer: replied 2 months ago.
Did not.work dealer wants 500.00 I don't know
Expert:  david craig replied 2 months ago.

ok im going to look something up. give me a few

Expert:  david craig replied 2 months ago.

ok. if the sensor is new. and the old sensor worked before it was broken, the only thing it can be is a bad new sensor.

Customer: replied 2 months ago.
checked voltage on red and white i got 11.4 volts some one said it should be 5 volts
Expert:  david craig replied 2 months ago.
Im on vacation and im unable to see our whole conversation on my phone for some reason. Please reply to this to see if i can respond
Customer: replied 2 months ago.
good morning i was told i should have 5 volts on power side i have 11.4 volts red and white wire