Losing heat

Michael Owner/Technician Pennsylvania Posted   Latest  
Discussion
Driveability
2006 Chrysler 300 C 5.7L (H) 5-spd (NAG1)

We have an ongoing issue with this '06 300 that seems to loose about a half gallon of antifreeze periodically. Previously this got a new radiator (cracked) and a thermostat in January, 2019. Came back with the concern of the temp gauge fluctuating in late August which we added about a half gallon and re-bled. Now back today with the same issue but also no heat. Another half gallon low. When the radiator and thermostat were replaced, the visit in August and today we used that bleed screw near the thermostat housing to bleed the air. In January we vacuum filled it but just added it the last 2 times with the spill free funnel and bled it at that allen screw. Has anyone encountered this before on these Hemi's?

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George Owner/Technician
Alaska
George Default
 

I have a lot of fleet vehicles that I work on. Anti freeze usage gets ridiculous sometimes. The most overlooked part of the cooling system is the pressure cap. If it won't hold proper pressure the antifreeze will get pushed out. I know it sounds to simple or the cap was replaced with the radiator. Quality control.......... If you have checked for the usual leaks and found no evidence of anti…

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Nelson Manager
California
Nelson Default
 

Anytime the customer says that the temperature gauge fluctuates tells me that the engine might of overheated in the past. Have you done a block check yet? I would do one with the engine cold and hot.

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Tim Mechanic
Arkansas
Tim Default
 

Would you use a chemical checker, or is there a better way?

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Justin Technician
California
Justin Default
 

If you have a gas analyzer check for hydrocarbons in cooling system if present suspect damage to the block, cylinder head, and cylinder head gasket . The “air in system could be exhaust gases”

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Michael Owner/Technician
Pennsylvania
Michael Default
 

My landlord still has a functioning dyno so I'll be asking to use the 5 gas analyzer tomorrow.

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Tim Mechanic
Arkansas
Tim Default
 

I wish I had a gas analyzer, but my state doesn't have an emissions program yet and I haven't been able to justify one. Thank you for the suggestion, though. I might have to squeeze one out of the budget soon!

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Randy Diagnostician
California
Randy Default
 

Hook a cooling system pressure up and see if pressure gos up rapidly while running . Works every time

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Michael Owner/Technician
Pennsylvania
Michael Default
 

That is a fantastic idea, Randy.

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Michael Owner/Technician
Pennsylvania
Michael Default
 

How fast would it rise if there were an issue?

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Randy Diagnostician
California
Randy Default
 

You would see a rise pretty quick not a lot butt I have seen as little as 7psi in a very short time . Just my testing

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Jonathan Educator
California
Jonathan Default
 

Michael; Good evening Sir I hope this message finds you doing well. If you have an inspection camera you can remove the spark plugs and look for the "Clean Cylinder". Usually with an engine that has a slow leak one or more cylinders will have clean piston tops and/or clean cylinder domes. Sometimes with a pressure tester attached to the radiator you can even see antifreeze running down the…

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Benjamin Diagnostician
Tennessee
Benjamin Default
 

Do you have a scope and a pulse sensor?

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Michael Owner/Technician
Pennsylvania
Michael Default
 

4425 and a WPS500 👍

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Randy Diagnostician
California
Randy Default
 

Yes you can use a scope butt quicker my way . If you want to use scope check out super mario on y tube he did this a few months ago

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Michael Owner/Technician
Pennsylvania
Michael Default
 

Literally watching right now

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Randy Diagnostician
California
Randy Default
 

Do you subscribe to him ?? If not do he is pretty damn good

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Michael Owner/Technician
Pennsylvania
Michael Default
 

Yep, I do

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Geoff Diagnostician
Hawaii
Geoff Default
 

I forgot about that video, thank you for mentioning it.

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Benjamin Diagnostician
Tennessee
Benjamin Default
 

The WPS500 is a pressure transducer but not a pulse sensor. A pulse sensor is much more sensitive than a pressure transducer. It doesn’t measure pressure or vacuum directly, but measures a change in state. It is extremely sensitive. It is similar to a knock sensor. If you attach a pulse sensor to the cooling system it should be obvious if you are getting compression spikes in the cooling system.

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Justin Mobile Technician
Utah
Justin Default
 

You can make the WPS act just like a pulse sensor.

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Scott Technician
Wisconsin
Scott Default
 

If you can't find an external coolant leak with pressure and suspect a H/G just warm it up at the end of the day. Let sit and cool and with first start in the morning if it has a misfire that goes away in a minute or two you may have confirmed a head gasket. Check misfire code and pull that plug to see washed cylinder. HTH

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Tim Mechanic
Arkansas
Tim Default
 

All great ideas, guys. Thank you!

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Lew Owner/Technician
New Jersey
Lew Default
 

Along with all that has been suggested, our new go to tool for head gasket leaks is the ATS Bullseye tester

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Gary Owner/Technician
Michigan
Gary Default
 

Already mentioned but if no visible leaks, chemical checker, look into cylinders for a clean piston top. I've also had good luck using a gas analyzer to sniff the coolant. It will pick up the HCs. One of the reasons I never parted with my old Allen big box analyzer w/ 2-gas. Just don't let the analyzer suck in any coolant.

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Kevin Owner/Technician
Georgia
Kevin Default
 

I have had success by bringing each cylinder up on TDC and pressurizing the cylinder with the radiator cap or degas bottle cap off and watching for bubbles. I know this is time consuming and next to impossible with some engines but if you have a suspected cylinder that is de-carboned or cleaner than the others by viewing with an inspection camera it may be worth the verification.

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Bradley Educator
Ohio
Bradley Default
 

That's my go to. Never lies.

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Nelson Manager
California
Nelson Default
 

Hey Mike, Have an update on this one for us?

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Michael Owner/Technician
Pennsylvania
Michael Default
 

Nelson, since then the customer has parted ways with this vehicle.

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