Question about 2003 Cadillac CTS

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2003 cadillac cts coolant temperature sensor

Need to find location of sensor and how to replace it

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  • Anonymous Jan 14, 2009

    need picture of where temperature sensor is located

  • Anonymous Jan 19, 2009

    its throwing p0138 error code

  • Anonymous Mar 18, 2014

    how to replace wheel bearing on cadillac cts 2003

  • Anonymous Mar 18, 2014

    replace temp sensor

  • Anonymous Mar 23, 2014

    i want to know what tools u needed for a cat converter replacement on my 2005 cts



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I cant find a pic of the loctation.

It is under the intake in the back in the coolant bridge it is not bad to change if you are not affaid to take the intakes off but to get to it you have to take the intake off

Posted on Jan 19, 2009

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Increased temperature of the car Cadillac 2003 and the computer asked me to turn off the car and when I opened the radiator cap means and grandmother with a mixture of oil out of the coolant tank in the form of foam for the light beige color

Posted on Nov 04, 2010

  • modesto perez Apr 29, 2012

    your oil cooler is leaking

  • modesto perez Apr 29, 2012

    that means there is oil in their....maybe your oil cooler is leaking



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Posted on Jan 02, 2017

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SOURCE: Location of coolant temperature sensor

Maybe this will help . although this is from a 1997 Caddy.

Cadillac DeVille Engine Coolant Temperature (ECT) Sensor Location62451583.gif

Posted on Nov 24, 2008

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Related Questions:

1 Answer

Where can I find the temperature coolant sensor on a 2007 Cadillac CTS

Why ? Temp gauge not working , cooling fans not working ? Is the check engine light lit an you have a coolant temp. sensor code ? The coolant temp. sensor is a input to the PCM/ECM - engine computer . If bad would turn on the check engine light. Trying to save you money an time replacing a sensor that may not need replacing .

Jul 04, 2018 | Cadillac Cars & Trucks

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Temp gauge not working 2004 cadillac cts

It would have to be on a scanner to see if the PCM is sending a signal(most likely is, other gauges working). Instrument panel gauges do go bad. And they can be replaced.

Feb 19, 2015 | 2004 Cadillac CTS

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Where is the intake air temperature sensor located on a 2003 cadillac cts?

this sensor is located on the breather line entering into your throttle body , as it measures the temperature intering the throttle body and manfold so that your computer can adjust for proper fuel efficiency and operation ,,,,,good luck !!

Aug 21, 2012 | Cars & Trucks

1 Answer

2003 Cadillac CTS at 225,000 miles Code P0128 comes up periodically. Any solution other than a thermostat change at $400 plus?

First off who ever said $400 to change a thermostat is trying to rip you off. The actual part is like $20 bucks max and its so easy to change. I can guide you through it if you would like.

The P0128 code is Coolant Thermostat Malfunction.

These are the possible causes for this code:
- Insufficient warm up time.
- Low engine coolant level.
- Leaking or stuck open thermostat.
- Malfunctioning engine coolant temperature sensor.

These are the possible quick fixes:
- Top OFF Engine Coolant
- Replaced Thermostat

Jan 15, 2011 | 2003 Cadillac CTS

1 Answer

Hi I own a 2003 Cadillac CTS I am getting a check engine light error light with code P0128 and my heat is fluxuating up and down I have already installed a themostat. What are my options

A code P0128 may mean that one or more of the following has happened:

1-Low engine coolant level
2-Leaking or stuck open thermostat
3-Faulty cooling fan (running too much)
4-Faulty coolant temperature (ECT) sensor
5-Faulty intake air temperature (IAT) sensor

Check coolant level
Check to make sure thermostat is functioning properly Check the Cooling fan Check the ECT sensor Check the IAT sensor If all else fails replace the thermostat

Jan 05, 2011 | 2003 Cadillac CTS

1 Answer

Engine coolant temperature sensor

it is on the left side cylinder head...about mid way...between number 2 and number 4 Ignition coils...but lower...below but not under valve cover.

Jul 10, 2010 | 2006 Cadillac CTS

1 Answer

Message P1028 Heat Sensor or Thermostat problem,I was told by Dealer Cost to repair $1400.00 estimate only.We have conrolled heat in car re:temperature and same for Air Conditoning.Anti freeze OK. What are...

P0128 is the DTC for "coolant temperature too low for closed loop".
The computer knows what the Coolant temp should be and if it stays below regulated temperature for too long the code will set. This occurs more frequently in the winter when temperatures plummet.

The quickest and most reasonable solution would be to replace the engine thermostat, reset the DTC code and try again.
The biggest drawback for driving under this condition will be fewer miles per gallon as the engine needs higher temperatures for efficient combustion.

I also wouldn’t take it to the Cadillac dealer… in my humble opinion, they are trying to fleece you.

Feb 04, 2010 | 2003 Cadillac CTS

1 Answer

2003 cadillac cts will not blow hot air, but my air condition blow cold air

Is the engine temperature at the proper point?
Since the AC works, I assume the fan is blowing. This means I would look at the temperature sensors and control unit next. Try varying the temperature setting way up to see if there is a point where it starts working.

Oct 18, 2009 | 2003 Cadillac CTS

1 Answer

Trying to locate the CTS sensor on 1999 eldorado

its next to the thermostat housing on the front of the intake manafold

Mar 16, 2009 | 1999 Cadillac Eldorado

1 Answer

Location of coolant temperature sensor

Maybe this will help . although this is from a 1997 Caddy.

Cadillac DeVille Engine Coolant Temperature (ECT) Sensor Location62451583.gif

Nov 20, 2008 | 2004 Cadillac CTS

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