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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum


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Old 10-03-2019, 11:07 PM   #1 (permalink)
mfoster442
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Coolant Temp sensor - dumb questions, pic attached

Hey Everyone,

Would how far you thread in the coolant sensor affect it's temp reading? is this in far enough? It didn't want to go any further with a decent amount of torque, and I didn't want to force it. It's not leaking. The reading does seem to be on the cool side though...although I replaced the old sensor because the shop that put my cylinder heads on said it was reading about 10 degrees hotter than real temp.

Can it be installed too far? This is the AC Delco unit.

I just ran the preston flush and drained...is it necessary to wait 'til the engine cools off to fill with water, run it and flush?

THanks!

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File Type: jpg coolant temp sensor.jpg (80.7 KB, 13 views)
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Old 10-04-2019, 09:45 AM   #2 (permalink)
heymccall
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Depth won't make a difference. The needle in the dash is not precise.
How could they know the real temp? Infrared temperature gun, resistance of sensor vs resistance chart, scanner reading vs needle?

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Old 10-04-2019, 10:35 AM   #3 (permalink)
mfoster442
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Thanks heymccall. I thought it probably wouldn't affect it, but i'm just not taking any chances I don't have to.

with the new sensor installed, the radiator flush and degreaser run though it, drained and now with water it's reading on the low side...but the engine also feels cooler than I used to also.

Today i'll finish flushing the radiator and install the new thermostat and should be good to go.

Thanks again!
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Old 10-04-2019, 10:44 AM   #4 (permalink)
JMJNet
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Those are pipe thread (NPT), it cannot go deeper than that.
Well, it probably will go deeper but you are running the chance of cracking the hole.

At least with some of the NPT parts I have dealts with.
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Old 10-04-2019, 11:22 AM   #5 (permalink)
mfoster442
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Thanks JMJNet. Just seems like it wasn't in as deep as the other, and didn't want to have it incorrectly installed and/or not read correctly.

I'll probably never know if the other was getting inaccurate or not...I was thinking after 25 years it couldn't hurt to put a new one in, they're inexpensive.

I may not have a cooling issue at all. I'll get it up to temp once I have coolant in it and check with a thermometer gun.
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Old 10-04-2019, 12:16 PM   #6 (permalink)
Ron Nielson
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In your picture, it looks like the green wire going to the connector looks like it might be frayed. Is that possible? A little hard to see in the picture for sure.
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Old 10-04-2019, 12:49 PM   #7 (permalink)
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Quote:
Originally Posted by mfoster442 View Post
Thanks JMJNet. Just seems like it wasn't in as deep as the other, and didn't want to have it incorrectly installed and/or not read correctly.

I'll probably never know if the other was getting inaccurate or not...I was thinking after 25 years it couldn't hurt to put a new one in, they're inexpensive.

I may not have a cooling issue at all. I'll get it up to temp once I have coolant in it and check with a thermometer gun.
When you just flushed the coolant, you may want to drive it around until all the air is purged.
Then wait till morning and see if you need to add coolant.

At that point, temperature is important but it will be unstable till everything equalized.
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Last edited by JMJNet; 10-04-2019 at 12:50 PM.
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Old 10-04-2019, 02:15 PM   #8 (permalink)
mfoster442
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Thanks JMJNet,

Just ran it again to circulate the water. Cracked the bleeder valve after it was up to temp (as judged by IR gun...not the gauge) and just a bubble of air came out. Draining now. At this point the temp gauge seems to be reading low compared to my IR gun at the thermostat housing...I wish it was accurate. Hopefully it will settle out after I change the T stat, add coolant and bleed the system of air.
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Old 10-04-2019, 02:26 PM   #9 (permalink)
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Quote:
Originally Posted by mfoster442 View Post
Thanks JMJNet,

Just ran it again to circulate the water. Cracked the bleeder valve after it was up to temp (as judged by IR gun...not the gauge) and just a bubble of air came out. Draining now. At this point the temp gauge seems to be reading low compared to my IR gun at the thermostat housing...I wish it was accurate. Hopefully it will settle out after I change the T stat, add coolant and bleed the system of air.
Keep in mind that you will be burping air out of the system quite a bit..
It may take a day or more to get it fully purged
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Old 10-04-2019, 08:34 PM   #10 (permalink)
mfoster442
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Sensor and new T-Stat are in and everything is buttoned up with no apparent leaks.

Coolant temp sensor/temp gauge reading about 18 degrees cooler than reality which I don't like. Wish it was more sensitive and accurate, but it will have to do for now. I'll just note that two marks down from 210 is the danger zone.

Temp stayed very consistent on a test drive though. Just fluctuated between 170 and 180 on the gauge...

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