LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Quick question about a thingy...

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Old Mar 14, 2011 | 06:17 PM
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Default Quick question about a thingy...



I found a broken clip-in electrical connector on my motor today, driver's side of the motor, between the spark plugs, between the #1 and #3 cylinder. Looked through SH box, but couldn't seem to find exactly what it was. I can find and post up a picture if I need to, but I just wanted to know what it is, and how do I go about replacing it?

Thanks.
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Old Mar 14, 2011 | 06:26 PM
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Coolant temp gauge sending unit
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Old Mar 14, 2011 | 06:27 PM
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yep^^^
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Old Mar 14, 2011 | 06:30 PM
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that sounds like the coolant temperature sensor to me

Last edited by jester1614; Mar 14, 2011 at 06:35 PM.
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Old Mar 14, 2011 | 06:56 PM
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Cool, thanks guys. It's plugged right into the cylinder head. I looked at it a little more and it looks like it broke right on the sensor side in the motor (the plastic part) and not on the wire/clip itself. Meaning I'll just have to replace the sensor.

Is that censor just something I can grab at the dealership or will I have to order it online? Is it just threaded in there, or what is the removal procedure? ( sorry it's getting dark in the garage now and my drop like just took a **** )

Thanks for the quick responces.
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Old Mar 14, 2011 | 07:00 PM
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autozone.... $12 i think
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Old Mar 14, 2011 | 07:01 PM
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make sure you get the right one, i took mine in a few weeks ago and asked for the coolant temp sensor...it turned out to be the coolant temp switch, or vice versa i forgot
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Old Mar 14, 2011 | 07:07 PM
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Yeah I'll most likely pull it out and take it with me when I go to get a new one.

I was hoping this would have been the culprit to my car's surge in rpm at idle...not so lucky I geuss
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Old Mar 14, 2011 | 07:39 PM
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Originally Posted by MasterTomos
Yeah I'll most likely pull it out and take it with me when I go to get a new one.

I was hoping this would have been the culprit to my car's surge in rpm at idle...not so lucky I geuss
if i remember correctly all that sensor is for is the gauge, its the one in the water pump that tells the ecu the temp. So i dont think that is your issue
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Old Mar 14, 2011 | 08:09 PM
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Originally Posted by jester1614
if i remember correctly all that sensor is for is the gauge, its the one in the water pump that tells the ecu the temp. So i dont think that is your issue
The one in the WP is for the PCM
http://shbox.com/1/temp_sensor1.jpg

The one in the head is for the gauge
http://shbox.com/1/temp_sensor2.jpg

They're cheap and easy to replace.
Pick one up at the parts store.
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Old Mar 14, 2011 | 10:07 PM
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Cool, thanks guys
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Old Mar 14, 2011 | 10:34 PM
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remember when you take it out coolant will come out. just a fyi
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Old Mar 14, 2011 | 10:47 PM
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^Thanks for the heads up! How much coolant should I expect?
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Old Mar 14, 2011 | 10:56 PM
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i can't remember off hand, I had to change mine though, because i broke it putting in my lts. I just pulled it out quick and got the new one in as fast as i could and i lost a little bit. If your looking to take it out and into the store though maybe you want to drain your coolant.
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Old Mar 15, 2011 | 12:25 AM
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A lot.
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Old Mar 15, 2011 | 12:25 AM
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Originally Posted by jester1614
that sounds like the coolant temperature sensor to me
Nope.
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Old Mar 15, 2011 | 12:58 AM
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Originally Posted by gregrob
Nope.
how is it not a coolant temperature sensor (as it measures coolant temperature), I never posted that it was for the ecu, i even posted in a later post what that one does as opposed to the sensor in the water pump
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