I would likw to add, if did get to the PCM and burnish the connections, the issues takes longer than before to crop up.

 

Before trying, may i ask, is it actually a 2014 Impala 3600? (3.6) or some other?

 

You've seemingly already seen these:

...

 

Meanwhile:

What part# thermostat did you install.

Did you buy full-strength dexcool coolant or 50/50 mix? If full strength did you dilute it with distilled water before adding into system?

Can't go any further yet.

Respectfully it would help if we knew the general time lines between steps ref your original post. Knowing about how much time between and the chronological order can help shape the suggestions from afar.

..

It helps to know that code numbers are not for just a specific part or sensor. The code alerts to broken wiring and plugs. Other things on the circuit. The sensor AND the device(s) the sensor is protecting.

Did you visually or electrically check the wires and plugs?

...

Thanks.

.

 

Right, I've ready done the Google search on the fault code. The thermostat I bought was a Gates 34163, the time loke was across a few weeks, after the actual overheating, but I'm afraid I can't narrow that down.

Before I burnished the connectors on the PCM, it would only "work" for about a day. Afterwards it would go a few days before popping back up. Unfortunately this all i can really provide.

And yeah, sorry, its a 3600. 3.6 v6

 

Yeah, checked wires and plugs visually, dont have a means of checking them otherwise.

 

Is it actually overheating? Or is it a false indicator issue? Just for kicks after driving it, let it sit long enough to completely cool down and MAKE SURE it is full of coolant. Low on coolant will definitely cause this. I just replaced water pump on my Jeep and was sure it was full. Took it for drive and after a few miles gauge was pegged. It had air pocket and was low on coolant. Let it sit overnight re-checked it and it was a quite low.

 

It isn't. I've checked. The coolant level is at and has remained at the level line when cool, I've checked first thing in the morning and before leaving work in the afternoon.

Its a false reading on the dash, shows no temperature when this happens, but the real time data from the Bluetooth device shows normal tempatures around 195-200° when warm.

 

The plastic recovery tank level line does not always reflect the level inside. The water pump must always be under water so to speak. It sux IMHO that there is not a traditional radiator cap on the 3.6.

The code you have is for coolant not getting hot enough. If the coolant doesn't move but just sits in the radiator then it stays cold. But coolant in the motor gets hot. I don't recall where the 3.6 temperature sensor is for the OBDII Code but it must be in or at or after the radiator.

You didn't answer my valid question about 50/50 coolant mix. If it's stronger % abd most common error is undiluted 100% coolant, then you get this error. The conditions fool sensors and lots of phantom stuff gets adjusted by modules. But the give-away is the Code.

 

Sorry, personally mixed concentrate. The mix could if fact be off.

The sensor is on the motor on mine, right in front, super easy to get to.

 

Okay.

This is a good conversation for air in 3.6

https://www.impalaforums.com/threads/burp-coolant-system.1890856/#post-3733637

It's not like prior V6 Impala motors.

I'm aware. But trying to take things off the list.

Milk those hoses.

 

Roger, roger. I'll give burping the hoses another go this evening. Hopefully that'll fix the issue.

 

Take your hand and feel the upper & lower radiator hoses- that should tell you if the new thermostat is a dud or not.

 

Make sure that the battery is charged to 13.5 volts. Make sure that the battery connection s are clean and tight. Same with the ground connections beside the battery and the braided ground strap on the back of the engine to the fire wall area.