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Username Post: 2013 Malibu LTZ P0597        (Topic#364340)
Hombremosca 
Contributor
Posts: 200
Hombremosca
Age: 35
Loc: Salt Lake City, UT
Reg: 12-21-08
02-14-21 07:57 PM - Post#2814275    

Hey guys. It's been a bit. I'm having issues with my wife's car. Wonder if you guys can point me in the right direction.

My wife's 2013 Malibu LTZ had a cooling system leak that it went into the shop for. I had a good trusted mechanic friend handle the job as I just didn't have the time to tackle the job myself. He replaced the water pump, thermostat, belt and flushed the cooling system and refilled with Dexcool. I trust his work, and I looked at everything when I picked up the car.

A few minutes after leaving the shop, a single DTC popped up P0597. I didn't have time to really look at it, but the car drove fine. I brought it back the next day and we came to the conclusion that it was probably a bad part from the parts house that was causing the issue as all the plugs were in good shape. The thermostat was replaced again.

A day later, I picked up the car, and same code popped up. This time, I have time to tackle the problem myself. The issue is, that I've looked at all the possible problems, and am left scratching my head.

I cannot believe that I would have received 2 problematic thermostats in a row from the parts store. I checked fuse 47 under the hood, and it's still ok. It's not blown.

There isn't a problem with power or acceleration, and the temp gauge is working (although only sits around 1/4. Did this before this problem happened) I'm at a loss as to what is causing the issue.

Any chance someone has seen this happen? What am I missing? Should I just pull the thermostat AGAIN and get an AC Delco unit instead of an aftermarket one?

thanks for your help!

1971 Bel-Air - Deceased
1964 C-10


 




rockfangd 
"8th Year" Gold Supporting Member
Posts: 3087
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
02-15-21 11:18 AM - Post#2814289    
    In response to Hombremosca

Few things here.
Can you verify the coolant temp is accurate? MAybe the CTS is bad and throwing false readings.
Also I assume it was purged completely of air?
What was replaced is what I pictured correct?
Oem or aftermarket part?

Attachment: stat.jpg (19.24 KB) 2 View(s)




Old School GM fan FOREVER


Edited by rockfangd on 02-15-21 11:25 AM. Reason for edit: No reason given.

 
Hombremosca 
Contributor
Posts: 200
Hombremosca
Age: 35
Loc: Salt Lake City, UT
Reg: 12-21-08
02-15-21 01:01 PM - Post#2814297    
    In response to rockfangd

Hey rockfang. I guess i should have mentioned it is a 2.5L.

I did replace the whole assembly and yes it was purged.

The thermostat was an aftermarket one from Oreillys. It looks like this.

1971 Bel-Air - Deceased
1964 C-10


 
rockfangd 
"8th Year" Gold Supporting Member
Posts: 3087
rockfangd
Age: 34
Loc: Utica ny
Reg: 04-13-10
02-15-21 06:05 PM - Post#2814335    
    In response to Hombremosca

Ok. I figured that was the engine.
Weird there is 2 listed for that one.
The one I pictured and the 1 you pictured.
The one I pictured is genuine GM but seems to have more fittings on it
Can you verify coolant temp via scantool? I would monitor it from cold start through warmup, from open loop into closed loop.
Verify temp reading is close with IR gun close to the CTS.
Inspect the plug to the CTS, Look for corrosion, chaffed wiring, rodent..., etc...

Old School GM fan FOREVER


 
Hombremosca 
Contributor
Posts: 200
Hombremosca
Age: 35
Loc: Salt Lake City, UT
Reg: 12-21-08
02-15-21 06:17 PM - Post#2814337    
    In response to rockfangd

Ok, I will check it out wednesday as i'm out on the road now.

I'll verify temp with my scantool and an IR thermometer I have. Hopefully it coincides with what the sensor is displaying.

Although, come to think of it, if the scantool does not register a temperature, does that mean the temp sensor is in fact bad?

I find it really hard to believe that I would have two bad thermostats in a row...

1971 Bel-Air - Deceased
1964 C-10


 
Shepherd 
Frequent Contributor
Posts: 2227

Loc: Lake George, NY
Reg: 11-11-15
02-18-21 01:11 PM - Post#2814543    
    In response to Hombremosca

Are you sure the system was properly bled and is not somewhat air bound.



 




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