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Old 11-11-2008, 01:48 PM   #1
funk53daba
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Default coolant sensor vs. coolant sender

All right, so what I've gathered is my 95 SC2 has two parts that look practically identical...one is the coolant temperature sender, the other is the coolant temperature sensor. One of them affects my gauge reading in my dash. The sensor has two wires going to it, it's the one closest to the ground, and it's the one people refer to as the ECTS. All that correct?

...
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Old 11-11-2008, 01:57 PM   #2
Low Saturn
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2000 SC2
Default Re: coolant sensor vs. coolant sender

The two wire sensor is what sends temperature information the PCM and controls how the engine functions. Its the one closer to the bottom of the head.

The one wire sensor sends temperature information to the gauge on the cluster.

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Old 11-11-2008, 05:59 PM   #3
aa4lr
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1999 SL2
Question Re: coolant sensor vs. coolant sender

Quote:
Originally Posted by Low Saturn View Post
The two wire sensor is what sends temperature information the PCM and controls how the engine functions. Its the one closer to the bottom of the head.

The one wire sensor sends temperature information to the gauge on the cluster.
Here's a stupid question -- why is it that the ECTS fails so catastrophically in older Saturns, but the very similar single-wire sender does not? Aren't they essentially the same technology sitting in a nearly identical environment?

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Old 11-11-2008, 06:02 PM   #4
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2000 SC2
Default Re: coolant sensor vs. coolant sender

They fail because of the design of the tip. Older one had a plastic tip while newer ones have a metal tip.

The other one probably fails just as much, it just doesnt cause drivability problems.

I guess you could always experiment and switch the two.

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