I know it's that sensor that is causing my temp gauge to go up and down and sometimes cold causing fan to almost continuously blow. Pending codes P00B7 and P0119
For all kind of repair manuals. I used to visit here.
https://big-manuals.com/products/chevrolet-chevy-malibu-complete-workshop-service-repair-manual-2011-2012-2013-2014-2015-2016
Testimonial: "Thanks for reply, but I found it. It's located a top the water intake valve on driver's side of engine just to the side of the fourth cylinder. I released the pressure in the coolant reservoir then twisted it slightly to the right to expose the pin enough to wedge it out. Then removed the temp sensor and replaced it. Car is back to normal, no codes. OBD2 scanner is showing a maintained ECT temp at 217 after fully warmed up engine. I knew it was the sensor just didn't know where it was located. I found out where it was when I looked at the item discription page at Autozone where I bought the replacement sensor. I'm still going to buy a manual, considering my next DIY project is replacing bushings in my front suspension. I also found this website https://www.repairmanuals.co along with big-manuals.com, (thanks,Marcus for info) They had my model chevy's manual which is accessible online for 29 bucks. Other than that it's a hefty $295."
The coolant temperature sensor on that car is actually on the side of the radiator. It sounds like you may have a loose wire somewhere between there and the ecm (computer) check wiring thoroughly. Best to use an ohmmeter and wiggle the wires as you do it. It has an intermittent signal is basically what those codes are saying.
I am glad your current issue is resolved and wish you the best results on your next ambitious Malibu repair. I am adding a couple of images fyi. I did automatically assume it was this one that had you puzzled because it is in an unusual position. So if it does give you trouble in the future, at least you will find it.
Testimonial: "Thanks, for response, I thought about that, but concluded that it was the sensor itself after replacing the thermostat housing next to the water pump and inspecting the harness. Those codes cleared and returned when the gauge started going up and down and the scanner was reading ECT temps well above 240 and then dropping to 208 in two seconds, anyway all is well now. No more codes pending or stored."
SOURCE: 2001 malibu-heater is blowing cold air
sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!
SOURCE: location of the coolant temperature sensor
You will find this sensor where the fat hos comes from the radiator and conects to the engine block. It would be on the housing where the thermostat is located. If it is not there you should look for a sensor that has a wire connected to it anywhere on the engine block where a water inlet is located. I hope this helps. Don't forget to rate my answer, thanks.
SOURCE: location coolant temperature sensor 4.2 liter envoy ?
COOLANT TEMP SENSOR IS MOST LIKELY BAD. NEED TO CONNECT TO THE OBD CONNECTOR WITH A COMPUTER AND SEE WHAT TEMP THE COMPUTER IS SEEING.
SOURCE: Where is the coolant temperature sensor located on 2000 Altima?
THE SENSOR FOR THE GAUGE IS ON THE HOUSING THE UPPER RADIATOR HOSE ATTACHES TO.
SOURCE: 2002 malibu runs hot.
Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE
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The IPC detects a loss of serial data communications with the ECM.
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The BCM detects a loss of class 2 communications with the PCM.
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The IPC detects a loss of SPI communications with the BCM.
Your gauge is more suspect then the sensor . gm had a problem with stepper motors that control the pointer for the gauge !
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