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2003 GMC Yukon coolant temperature sensor location

Tiny
TIMMBUKK
  • MEMBER
  • 2003 GMC YUKON
Engine Performance problem
2003 GMC Yukon All Wheel Drive Automatic

I cannot find the location of my coolant temperature sensor to replace it. Any help is greatly appreciated!
Tuesday, December 15th, 2009 AT 2:56 PM

9 Replies

Tiny
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See below


https://www.2carpros.com/forum/automotive_pictures/12900_ect_10.jpg



https://www.2carpros.com/forum/automotive_pictures/12900_ect1_3.jpg

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Tuesday, December 15th, 2009 AT 3:51 PM
Tiny
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I hope this even what is wrong with my truck. It only started happening since it has been colder. I will start the truck, it will shake as if were going to stall for 0-90 seconds and then will be fine after it warms up? Does anyone know if that sounds like it needs a coolant temperature sensor?
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Tuesday, December 15th, 2009 AT 6:04 PM
Tiny
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Clean and test the idle air control valve and see what happens-disregard the CTS for the time being.
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Tuesday, December 15th, 2009 AT 7:39 PM
Tiny
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Can you please tell me where to find the idle air control valve? Thank you so much for your help.
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Tuesday, December 15th, 2009 AT 7:47 PM
Tiny
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IACV is within the throttle body-you gonna end up needing a repair manual for other tests
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Tuesday, December 15th, 2009 AT 7:50 PM
Tiny
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Thanks again for all of your help. Check engine light comes on now. I had it hooked up to the scanner at autozone and it read "lean bank 1 and 2, and random multiple cylinder misfire"? Please help. I had a recent tuneup and changed the coolant temp sensor. I thought it was the coolant temp senor but obviously not. Still shakes violently when cold until it warms up and RPMs are jumpy after it warms up.
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Wednesday, January 20th, 2010 AT 9:39 AM
Tiny
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Lean A/F mix:

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Wednesday, January 20th, 2010 AT 11:27 AM
Tiny
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Does anyone have a diagram on where the throttle body is located? Thanks in advance!
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Wednesday, January 20th, 2010 AT 6:41 PM
Tiny
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This is your throttle body assy


https://www.2carpros.com/forum/automotive_pictures/12900_throttle_body_1.jpg

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Wednesday, January 20th, 2010 AT 7:02 PM

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