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What is the sensor on the side of the block between the number one and number three plugs?

Tiny
CARLOS ORTEGA
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 255,000 MILES
I would like to know what the sensor on the side of the block between the #1 and #3 spark plugs is called. I thought it was the temperature sensor and then I watched a video and they called it the "coolant temperature sending unit" which makes no sense if the temperature sensor unit is on top of the block in front of the thermostat which I replaced. My temperature gauge only goes up to about 150 or 160 which can't be right is why I am wondering about this. I will do more research but any help would be appreciated. Thanks.
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Monday, January 4th, 2021 AT 4:58 PM

4 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again, Danny here.

That auxiliary cooling fan temperature sensor located in the cylinder head is used in conjunction with the coolant temperature sensor located next to the thermostat. The auxiliary temperature sensor is used to control an auxiliary electric fan if equipped. I've attached pictures below showing its location and description. Hope this helps and thanks again for using 2CarPros.
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Monday, January 4th, 2021 AT 10:01 PM
Tiny
CARLOS ORTEGA
  • MEMBER
  • 8 POSTS
Okay! Got it it. I found the answer here, disregard my last message.
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Tuesday, January 5th, 2021 AT 7:53 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
You're welcome!
Thanks again for using 2CarPros and we hope you will use our site again in the future.

Danny-
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Wednesday, January 6th, 2021 AT 4:11 PM
Tiny
JESSEWA
  • MEMBER
  • 1 POST
Location shown is on passenger side of 7.4l, not a 5.7l between the #1 and #3 plug on driver's side.
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Friday, September 16th, 2022 AT 5:26 PM

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