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HELP Me please! Abt coolant temp sensor

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Old Mar 1, 2012 | 10:09 PM
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Default HELP Me please! Abt coolant temp sensor

Okay, allow me to explain why and what I need a help with this coolant temp sensor or whatever is it on passenger side's block or head that have some kind of sensor screwed in between last two sparkplug holes. I was putting engine on the stand and its fell on the floor as its smashed that part and I did not remember what is it looked like so I need someone to tell me what is it and where can I buy the right one for it. As for me being rookie, what connector that connect that sensor as well. Its 1985 TPI and thank you very much.
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Old Mar 1, 2012 | 10:19 PM
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The CTS is up front on the intake
The sensor you broke is for the temp gauge it has a fitting like a knock sensor
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Old Mar 1, 2012 | 10:32 PM
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Temp gauge? Oh okay, I was told that its was CTS but thanks! DO you know where I could buy it from?
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Old Mar 1, 2012 | 10:44 PM
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Originally Posted by THE 383 admiral
The sensor you broke is for the temp gauge it has a fitting like a knock sensor
85 has gauge sender in drv side

Originally Posted by VetteFan85
I did not remember what is it looked like so I need someone to tell me what is it.
Check drv side head between first 2 cylinders ,see if there is a sensor there
and whether it looks like this one

http://www.ecklerscorvette.com/corve...1981-1991.html

or this
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F

Last edited by vetteoz; Mar 1, 2012 at 10:52 PM.
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Old Mar 1, 2012 | 10:54 PM
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Yes, on the driver side have that kind sensor, I already pulled that one out and its still connected to the wire. I am trying to find the passenger side one and seem that I have no luck, would be greatly appericate it if someone could send me a link that I can buy that. I am in progress of transferring all parts from old motor into crate motor but I am very new to corvette so I hope that you guys will help me out till the end
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Old Mar 2, 2012 | 12:32 AM
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Originally Posted by VetteFan85
Yes, on the driver side have that kind sensor,

I listed 2 ; which one do you have?

Originally Posted by VetteFan85
I am trying to find the passenger side one and seem that I have no luck,
The one in drivers side should be same as 1st link ;the temp gauge sender
Which would make the one in the pass side a fan switch; looks like the one in 2nd link

Last edited by vetteoz; Mar 2, 2012 at 01:14 AM.
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Old Mar 2, 2012 | 12:53 AM
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Just a guess on my 84 it was the engine cooling fan switch/sensor it turned on the main fan. The 85 may have used this same switch/sensor for the auxiliary fan switch maybe just a guess..Does it look like this..I found this on zips website, just put in the year and coolant switch and it will bring them up...one is a low temp coolant switch, the one pictured is the coolant temp sensor, hope this helps.


Last edited by DA1984VETTE; Mar 2, 2012 at 12:58 AM.
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Old Mar 2, 2012 | 02:11 AM
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Originally Posted by DA1984VETTE
Just a guess on my 84 it was the engine cooling fan switch/sensor it turned on the main fan.
In 85 the computer controlled the fan with the switch being a over ride
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Old Mar 2, 2012 | 05:43 AM
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http://www.summitracing.com/parts/JET-60600/
this is the one i used on my 85 when it broke, and yes its the fan switch.
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Old Mar 2, 2012 | 06:31 AM
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Originally Posted by vetteoz
85 has gauge sender in drv side


Check drv side head between first 2 cylinders ,see if there is a sensor there
and whether it looks like this one

http://www.ecklerscorvette.com/corve...1981-1991.html

or this
http://www.parts123.com/parts123/yb....Z5Z5Z50000050F
Okay The one from eckler is the one that show on driver side
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Old Mar 2, 2012 | 06:33 AM
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Originally Posted by blackozvet
http://www.summitracing.com/parts/JET-60600/
this is the one i used on my 85 when it broke, and yes its the fan switch.
But it's different from original right? If it is then that mean I have to cut the connection wire and connect the wire into new one as its goes with that sensor. Correct me if I am wrong but it's should be what you are saying since you have same year as I do.
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Old Mar 2, 2012 | 07:23 AM
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Originally Posted by VetteFan85
Okay The one from eckler is the one that show on driver side
Originally Posted by VetteFan85
it's should be what you are saying since you have same year as I do.
So like I originally said above your broken one is the fan switch

Does your wire on the harness at that position have a plastic connector like this ?



If so go to your parts shop and get a ACDelco # D1852B or get them to cross reference to same style unit.
A common fan switch used in 80's Camaros /Firebirds /Vettes and other GM cars

Or you can buy same style aftermarket switch that will turn your fan on at a lower engine temp

Originally Posted by VetteFan85
But it's different from original right?
If it is then that mean I have to cut the connection wire and connect the wire into new one
If you don't have that stock connector then you can use any temp switch you like
as you will need a new plug anyway

Last edited by vetteoz; Mar 2, 2012 at 07:46 AM.
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Old Mar 2, 2012 | 07:43 AM
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Originally Posted by vetteoz
So like I originally said above your broken one is the fan switch

Does your wire on the harness at that position have a plastic connector like this ?



If so go to your parts shop and get a ACDelco # D1852B or get them to cross reference to same style unit.
A common fan switch used in 80's Camaros /Firebirds /Vettes and other GM cars

if you don't have that stock connector then you can use any temp switch you like
as you will need a new plug anyway
It's the similar mine looked older and have some kind of metal needle instead of that. I would post a pic but I am new to this so I don't know how to post it sadly
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Old Mar 2, 2012 | 07:56 AM
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Yours may have aged a bit, but likely is the same connector. Here is a pic of my spare, you can see the pin.

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Old Mar 2, 2012 | 08:19 AM
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Originally Posted by VetteFan85
But it's different from original right? If it is then that mean I have to cut the connection wire and connect the wire into new one as its goes with that sensor. Correct me if I am wrong but it's should be what you are saying since you have same year as I do.
yes, you get the switch and the connector, you just cut the old connector off (its prob stuffed by now after 25 years of heat)
the new connector has a crimp fitting built into it, its easy to do and sets of the primary fan at 195 degrees.
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Old Mar 2, 2012 | 09:08 AM
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Yeah it's look like that without the plastic tube wrapping around the metal tip. So which temp sensor should I be getting? And thanks
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Old Mar 2, 2012 | 11:01 AM
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Are these arranged differently every year?

On my 87,
the passenger side (between 6 & 8) is the temp gauge display sender unit. does nothing else. Blade type plug. (the broken sensor in question?)

driver side (between 1&3) is aux cooling fan temp switch..not even an issue if there is no pusher fan. Pin type plug on switch.

Coolant temp sensor for ECM is front of intake manifold. 2 pin plug. Next to cold start switch also 2 pin plug.
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To HELP Me please! Abt coolant temp sensor

Old Mar 2, 2012 | 03:03 PM
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Originally Posted by blackozvet
yes, you get the switch and the connector, you just cut the old connector off (its prob stuffed by now after 25 years of heat)
the new connector has a crimp fitting built into it, its easy to do and sets of the primary fan at 195 degrees.
Alright but can you tell me what site or which store that I can purchase it? Thanks and I appreciate your help
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Old Mar 2, 2012 | 07:41 PM
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Originally Posted by VetteFan85
Alright but can you tell me what site or which store that I can purchase it?
Go to any auto parts shop ;AZ , Napa , whatever
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Old Mar 3, 2012 | 05:51 AM
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Originally Posted by VetteFan85
Alright but can you tell me what site or which store that I can purchase it? Thanks and I appreciate your help
The link i posted to summit has the part you need,
on the 85 the left side (drivers side) is the auxillary fan,
on the right side is the primary fan,
I know this 195 f switch works, when we had the snapon reader hooked up to the ecm doing the timing the primary fan came on as soon as the temp hit 195
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