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Cooling tempreture sensor

My code on my 2002 blazer indicates a cooling temp sensor bad. Can you tell me where it is, and or replacement procedures.

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1999 chevy blazer 4wd 6 cyc 4dr code P0420 Catalyst System effecency below threshold Bank 1 confirmed


There is a chance that your temp sensor is the culprit on both codes. The temperature sensor is what tells the ECU how hot or cool the engine is and weather or not to keep the engine in phase lock loop, or choke, mode. If the engine stays in phase lock it will run too rich and the O2 sensor will not be able to compensate.

Aug 04, 2014 | 1999 Chevrolet Blazer

1 Answer

Primary cooling fan only comes on when i turn ac on


You would need a scanner and an inferred temp sensor to troubleshoot the system.
You need to know what the actual engine temp is, and what the temp sensor is telling the computer.
If and when the engine reaches 220 degrees, the engine temp sensor should be sending that data to the computer and it should ground the fan relay to activate it.
Unplugging the sensor and having the fan run tells you the sensor is connected, and there should have been a trouble code set at that time.
It is possible the coolant level is low, or something else preventing the temp sensor sending the correct data.

Apr 16, 2013 | 2002 Chevrolet Malibu

2 Answers

98 blazer 4.3 engine won't start code p0336, already replaced crank sensor


which crank sensor do you replaced ? the P0336 means P0336 Crankshaft Position Sensor A Circuit Range/Performance.

________________
autel maxidas 708

Feb 25, 2013 | 1998 Chevrolet Blazer

1 Answer

1993 S-10 Blazer runs great then dies at temp


If you have Code 15, you need a volt meter or you will run into a wall. You measure the coolant resistor ohms when its cold then measure it when the engine is warm.You also have to measure one side for a 5 volt reference.Or better yet when the vehicle reaches operating temperature and begins to stall take the leads of the coolant temperature and jump it together.This tell the ECM your temperature is 266F. If its stays running and doest stall replace temp sensor

Mar 10, 2012 | 1993 Chevrolet S-10 Blazer

2 Answers

The check engine light will not go off and I have had emission problems before and tried to have it fixed. It may or may not have been fixed properly. Is it common in 2002 Chevy Blazers to have emission...


What you have is a bad sensor or possibly the EGR valve . At this point what you should do is take the vehicle to an auto parts store if you don't have a code reader . They will read the code for free for you and that will tell you witch sensor or emissions related part is giveing you the problem.Most sensors are vary easly replaced some you don't need tools but tend to be somewhat expensive so you don't want to blindly start replaceing sensors The OBD 11 system you have in your vehicle is vary good with reading codes and idenifying the correct sensor the problem is one sensor affects another sometimes so you may have to go back twice if the light comes back on depending on what is wrong . Sensors range 30 dollars to about 200 but most you could replace your self and save the shop bill Good luck with it its probabaly nothing realy bad and will run a lot better when you find the cause and replace it

Mar 05, 2011 | 2002 Chevrolet Blazer

1 Answer

Engine light on code p1296 was found the car is a 2001 jetta 80000 miles runs good all censor replace in the last five months it warms up fast idle good. pass smog. what can the problem be. thank you...


VW DTC 17704 (P1296) - Cooling system malfunction.

Coolant Temperature Sensor (CTS) is faulty and reading an incorrect temp'.

Replace with the new version of the sensor, clear the code.

If indicated coolant temp' is too low the thermostat is sticking open.

Jan 15, 2011 | 2002 Volkswagen Jetta TDI

2 Answers

Heater fan blows out cool air then car over heats then blows hot and cools the car back off. It does this over and over. Changed thermastat and waterpump already.


is your vehicle automat climate control ?
suspect the tempreture sensor in the vehicle is defective and is not giving a true reading of the relationship between the set tempreture and the true air tempreture.

Nov 13, 2009 | 2002 Pontiac Grand Am

2 Answers

Climate control air conditioner stops working due to incorrect ambient air temperature


Same car, same problem. Press MODE, FRONT and REAR buttons together to reset tempreture. You probably need to replace the sensor GM part number 15047946 it is in the front grill email me for a picture. chris.abbott@gmx.com

May 21, 2009 | 2002 GMC Envoy

2 Answers

Code PO118 chevy blazer 2002,after intake gasket replacement


hi john , sure sounds like you may have unplugged the coolant temp sensor or didn't get a good connection at the sensor , location , in between two exhaust ports on the side of the engine that has the oil fill and pcv .

J5

Jan 27, 2009 | 2002 Chevrolet Blazer

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