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6.9 Temp Sensor

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  #1  
Old 10-11-2009, 10:07 PM
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6.9 Temp Sensor

I searched around a bit but couldnt find a straight answer

My temp gauge only reads about 1/8 of the time. I'm guessing my temp sensor is bad or a have a bad connection somewhere.

Just need to know where the sensor is so i can start fiddling with it

Thanks
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Old 10-11-2009, 10:54 PM
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Front of drivers side head.

The engine was removed so the AC compressor is not on the engine in the picture.
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Old 10-12-2009, 11:55 AM
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Thats just what i was lookin for, thanks man
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Old 10-12-2009, 01:31 PM
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Dave I am not sure how many times I have seen you post that picture.....super nice of you!
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Old 10-12-2009, 09:33 PM
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Much easier that trying to explain, and I get to show off the engine a bit.
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Old 10-13-2009, 01:39 AM
bigb9582 bigb9582 is offline
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if i were to put a aftermarket temp guage in my 6.9, could i remove the engine temp light and still have a working factory temp guage??
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Old 10-13-2009, 07:53 AM
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You could but you wouldn't have the light. There is the same hole in the other head at the back with a bung in it you could use or I used one in the side of the block near the oil cooler.
Dave, why is your engine painted holden red instead of ford blue?
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Old 10-13-2009, 08:37 PM
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The gauge and light are independant of each other on 6.9 era trucks.

I just wanted to be different, that is actually Ford red and silver high temp paint.

Here it is right before I installed it after the rebuild.

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Old 10-13-2009, 10:10 PM
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Dave I gotta hand it to ya, that is one fantastic looking diesel Looks so cool painted Red!
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Old 10-13-2009, 10:20 PM
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Quote:
Originally Posted by IDIDieselJohn View Post
Dave I gotta hand it to ya, that is one fantastic looking diesel Looks so cool painted Red!

What He said! Looks Great!
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Old 10-14-2009, 10:28 PM
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what is considered the max operating temp?? or overheating temp??
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Old 10-18-2009, 10:25 AM
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Quote:
Originally Posted by bigb9582 View Post
what is considered the max operating temp?? or overheating temp??
Loaded most guys say 230F is tops. The dummy light comes on ~242F if I remember correct.

Now that I have a fully functional cooling system my temps dont go over 190F unless I am loaded or going up a big hill or mountain!

Thad
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Old 10-18-2009, 01:04 PM
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With the mechanical temp sensor in the head I see temps up to 235 degrees during normal operating conditions.

As soon as I am not pulling a hill, drops right back to 195 degrees.
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Old 03-02-2010, 07:20 AM
slimchance slimchance is offline
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Hey Dave. I've been searching for some answers and I think you might be my holy grail. I just bought an 87 f250 with a 6.9. The engine is not overheating, but the temp gauge is pinged at its hottest point. I know its not overheating because it does this right as the engine is started and doesnt change at all. Also, I just replaced the water pump and stat and hoses and flushed the radiator..

I replaced the sensor on the left of your infamous picture of the two sending units, and it's still doing the same thing. Do you think I have a short in the wire or is there some magical crazy thing that I am missing? This truck drives like a dream and although i am 100% positive that it isnt overheating, I am still apprehensive about going anywhere until I can get this sorted out.

I've been coming here for a while checking out little tidbits of info over the years, and the knowledge here is completely insane. I love it!
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Old 03-02-2010, 10:24 AM
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What does it do when you unplug it, is sounds like you have a grounded wire or a bad ground in the dash can cause it too.
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