A/C off due to high engine temperature

BRADLEY.STRUB

MEMBER
2013 CHEVROLET MALIBU
2.5L
4 CYL
85,000 MILES

I changed the sensor on the radiator, I put a new thermostat unit on it which had new sensor in it, that seemed to be where every thing pointed me. But it still wont work, and same message. My d=fan starts running the moment I turn car on, and it stays running even if I drive for 2 minutes, after I turn car off. What other sensors could it be? I got a readout and it states that engine coolant temperature circuit intermittent/erratic. What needs to be replaced to fix that issue? I believe that is what is stopping air from working.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,779 POSTS

Welcome to 2CarPros.

Could you provide the trouble code that you retrieved? That way I can see specifically what it involves and find the correct diagnostics.

There are two different temperature sensors on this vehicle. Picture 2 below shows the one on the radiator, which I believe is the one you replaced. Picture 1 shows the one on the thermostat housing. That is why I need to know the code you got.

Here are a couple links you may find helpful:

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Let me know.

Joe

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Tuesday, August 20th, 2019 AT 6:29 PM

BRADLEY.STRUB

MEMBER
2 POSTS

Yes I will I also changed the thermostat housing unti too, so both those sensors are new but my fan still runs right away when I start it and it stays running after I turn it off even if I drive for 2 minutes I got a bunch of them but any to do with coolant were
P00B7 engine coolant flow low/performance
i had 3 that said that all p00b7

then there was a P0119 engine coolant temp curcuit intermittent/erratic

all other things were to do with 02 sensor I figured it was the one that was erratic

ty brad

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Tuesday, August 20th, 2019 AT 7:44 PM

JACOBANDNICKOLAS

MECHANIC
109,779 POSTS

Welcome back:

That code (P00B7) is related to the thermostat itself. The thermostat has a build-in heating resistor. When the resistor heats up, the thermostat opens more, resulting in a lower engine operating temperature. That could be causing the fan to run all the time. However, there are mechanical things to check also.

Take a look at the picture I attached. It lists what to check with this code.

Let me know if this helps.

Joe

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