2006 chevy implala dashboard reading engine hot ac off. Already replace sensor

Engine coolant temperature sensor may be bad .

Chevy Impala 2006 2011 Factory Service Workshop repair manual

for the easy solution download the pdf file

The coolant sensor temperature is usually found just beneath the cylinder head, on the engine block.

You just disconnect the 1-2 wires and then undo it with a wrench.
The sensor will look like one of these:
1999 Chevy Lumina ltz 3 8 v6 coolant temperature sensor Google Search

Just be aware .. you may have TWO such sensors on your vehicle.

One sensor (usually with 3-4 electrical pins) is near the thermostat and works in conjunction with other sensors to regulate fuel/air according to engine temperature.

The other type of sensor is in the block near the cylinder head. It sends a signal to the temperature gauge on your dashboard ONLY. If your temp gauge constantly reads too hot or too cold .. this one is the culprit.
If it's a running fault .. speed .. rough running .. fuel. It may look like this:

Search Results

Engine Hot A/C Turned Off Silverado - YouTube

? 8:48
www.youtube.com/watch?v=w5vbWYbcecg
May 11, 2013 - Uploaded by aeroaggie This applies to 2008 Chevrolet Silverado 4.3L V6 WT models. ...the dash reading "engine hot, AC off"..on a 2007 Chevy Silverado4.8L. ... I have an 09 Silverado and the dealer changed thethermostat under warranty in 2013.

This sounds like a bad coolant temp sensor that give computer false reading, check the coolant temp sensor connector and if it is good with no bad wires to connector then replace coolant temp sensor , when the computer gets a signal from temp sensor that engine is hot it turns fans on high speed to cool radiator and displays a/c turned off , if this truck does not have electric cooling fans then they wont run just explaining what happens depending on engine and cooling set up. replace coolant temp sensor and check connector.

If you replaced the right sensor, there must be a problem in the wiring to the computer.
You did reset the computer - hit ac and recirculate buttons at the same time ??

http://hubpages.com/hub/Serpentine-belt-routing-diagram-2006-Chevrolet-Impala-LTZ-39 that should be the one

My truck is doing the same thing, also the gas gage is no longer correct, it was all due to a wiring harness i believe, covered by warrenty

YOUR ACTION IS REQUIRED:
If the engine is not really overheating and not low of coolant.
IF IT IS DO NOT CONTINUE TO RUN THIS VEHICLE.

RECOMENDATIONS: Sight unseen.

Replace the temperature sensor.

The Failed temperature sensor has a zero reading for the Control board, without this reading the car starts running in limp home mode or Default and assumes the engine is running hot, first thing to go is your comfort... The AC.
In addition starts the engine cooling fan to running full time.

Hope this tip helps.

r/
David

The temperature gauge is actually a needle that read a range of Hot/Cold on the dash instrument cluster. If you are referring to the coolant temperature sensor, the location depends on the engine size. Post the engine size and we'll answer it better.