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Old 06-24-2008, 01:07 PM   #1
3500srw
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Default Coolant temp sensor?

Expanded from the previous post titled "P0304 has me confused?"

I unplugged my ECTS connector to check for a resin tip and the tip of the sensor is a greenish/brown color. I thought mine was all brass, it is not. The replacements I found have plastic tips (electrical end) the rest is brass. Are these the correct replacements? I was told all brass on this forum, these are not.

http://www.partsamerica.com/ProductD...pe=290&PTSet=A

http://www.autozone.com/R,APP222411/...ductDetail.htm

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Last edited by 3500srw; 06-24-2008 at 01:14 PM..

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Old 06-24-2008, 01:21 PM   #2
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Default Re: Coolant temp sensor?

Yes, the part that gets wet must be all brass. The connector end is plastic. Also, before going nuts when it does not work look at the connector. It should NOT be green or gooey, if it is you have to replace it also. A junk yard connector off of the IAT sensor in the air box will fit and will be clean.

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Old 06-24-2008, 01:25 PM   #3
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Default Re: Coolant temp sensor?

wait P0304 is a cyl 4 misfire…. Ya you should replace to sensor but id check the plugs and wires too

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Old 06-24-2008, 01:46 PM   #4
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Default Re: Coolant temp sensor?

If you look at the photo with the 3 sensors, (http://www.saturnfans.com/forums/showthread.php?t=37884 ) the part that goes in the engine should be brass. The other end that receives the wire connector may not be brass. That's OK.

If you look carefully at the photo for a while, you will notice the difference btw the resin/brass tip unit. Jut below the hex they are different shape, and that way you can look at what's on your car without taking the ECTS out. Of course, if your wire connector is corroded...



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Old 06-24-2008, 01:47 PM   #5
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Default Re: Coolant temp sensor?

The TIP (the part that senses) must be brass. The connector end is still plastic. You can't see the tip from outside; it's busy inside, sensing the temperature. But there is an external "hint". Look at BarnOwl's photo of the two sensors: http://www.saturnfans.com/photos/sho...46177/size/big . Just to the left of the hex head, you'll see the brass-tipped sensor has a rounded "shoulder", and the plastic-tipped sensor doesn't. That part of the sensor is visible from outside. If you can peer down there, or use an inspection mirror, you can tell from that little section which kind of sensor is in place.

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Old 06-24-2008, 01:48 PM   #6
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Default Re: Coolant temp sensor?

I was looking at the pics in the how to library. Both links I posted are the correct brass tipped ECTS. There doesn't seem to be a way to know if it has the resin tip unless you actually remove it from the engine. At less than $10, I will be replacing mine.

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Old 06-24-2008, 01:49 PM   #7
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Default Re: Coolant temp sensor?

I need to type faster

Thanks for pointing out the difference in the shoulder of the sensors. I had to look again. I have the old resin tip style. I will be getting a new sensor.

Thanks to all

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Last edited by 3500srw; 06-24-2008 at 01:56 PM..

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Old 06-26-2008, 12:48 PM   #8
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Default Re: Coolant temp sensor?

I got my new "copper" tip ECTS installed. The old one has 2 slight cracks on the resin tip and just started to weep into the electrical portion. I caught it just in time, thanks to everyone here. I used some electrical contact cleaner to clean the connector plug really well. I put a small dab of anti-corrosion electrical grease on the plug for good measure!

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Old 06-26-2008, 11:45 PM   #9
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Default Re: Coolant temp sensor?

did it solve the problem?

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