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Open Roads Forum  >  Tech Issues

 > Temperature sender/sensor... 7.3L

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groundhogy

PA

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Posted: 04/28/22 05:33pm Link  |  Quote  |  Print  |  Notify Moderator

Hi All,

I think RV'ers tend to have a diverse knowledge of things.
Now that you're buttered. lol

My temperature sender/sensor is doing odd things.
It was just replaced (and I don't wish to contact them again.).

It is either all the way hot, or all the way cold. Occasionally I've seen it in the middle.

This morning I watched it carefully, as it was in the rare middle position. Within a few minutes I saw it rise to all the way hot. Pegged.

Then during the day it will switch to all the way cold.

Anyone ever heard of this happening?

BurbMan

Indianapolis, IN

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Posted: 04/28/22 05:42pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like you have air in the coolant system, some coolant systems have very specific bleed procedures after you open them up to replace components.

Ahhh....feels good to be buttered!

LittleBill

Scranton, PA USA

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Posted: 04/28/22 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

sounds more like the wiring is chaffed and causing issues with the sensor





groundhogy

PA

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Posted: 04/29/22 12:11am Link  |  Quote  |  Print  |  Notify Moderator

Thanks BurbMan.
You are wonderful.
And very insightful.
And full of ... intelligence...

groundhogy

PA

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Posted: 04/29/22 12:19am Link  |  Quote  |  Print  |  Notify Moderator

What about this theory.

Wrong part.
Same mechanical dimensions.
But more sensitive thermistor?

(Im assuming its some type of resistor inside)

groundhogy

PA

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Posted: 04/29/22 12:23am Link  |  Quote  |  Print  |  Notify Moderator

Cant be chaffed wiring cuz it worked before.

But i was thinking possibly the contacts in the connector weren’t touching properly, but i am now doubting that.

I took a sewing pin and tried scratching/cleaning contacts and attempted to bend contact plates so as to touch male pins better. No difference.

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 04/29/22 01:31am Link  |  Quote  |  Print  |  Notify Moderator

The only way to nail this to the sender is to put a jumper resistor between the disconnector sender plug and chassis ground.

If the gauge needle still wanders then you definetly have a gauge, or g
Harness problem.

Get on a search engine to the aficionado's web page for your vehicle. Your mission will be to ask the resistance range of your sending unit.
You need to go to radio shack and buy a resistor halfway in between the high andow resistance extremes.

Skibane

San Antonio, TX

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Posted: 04/29/22 01:43am Link  |  Quote  |  Print  |  Notify Moderator

Typically, the vehicle manufacturer publishes a chart (usually in the Factory Service Manual) that shows how much resistance the sender is supposed to be producing at any particular temperature.

You look up that resistance on the chart, and then use an ohm meter to measure the actual resistance being produced by your sender.

If your measured resistance comes close to matching the resistance shown on the chart, you know that your sender is good - and that you problem is somewhere else.

wa8yxm

Davison Michigan (East of Flint)

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Posted: 04/29/22 04:27am Link  |  Quote  |  Print  |  Notify Moderator

LittleBill wrote:

sounds more like the wiring is chaffed and causing issues with the sensor


Second on a wire issue.. Hot/Cold one is shorted the other open.

Middle of the dial. that's when it is reading the sensor.


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


BurbMan

Indianapolis, IN

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Posted: 04/29/22 06:09am Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:

You need to go to radio shack and buy a resistor halfway in between the high and low resistance extremes.


Mex you've been south of the border for too long, no more Radio Shacks.

I'm changing my diagnosis to wiring also. Air in the system will cause the gauge to go full hot when the air pocket hits the sensor area, but does not explain the gauge going to full cold after that.

At the same time, chafed wiring is not as likely on newer vehicles....I would replace the sender and see if that fixes it, they are fairly inexpensive.

[image]

* This post was edited 04/29/22 06:29am by BurbMan *

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