Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: KcCrown]
#2853561
11/30/20 09:10 PM
11/30/20 09:10 PM
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Joined: Sep 2014
Posts: 1,408 Central Pa
moparjim79
pro stock
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pro stock
Joined: Sep 2014
Posts: 1,408
Central Pa
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I do t want to discourage you to much, but its becoming apparent you shouldn't be working on cars. Don't get upset, do exactly what we told you. If it seems like too much is there for you to deal with/ too involved, have a garage work it and save yourself the agony. Even the best shade tree wrenches get beat sometimes and need a pros help .
You didn't get any CELs did you? Like a temp sensor or the like, right?
Last edited by moparjim79; 11/30/20 09:14 PM.
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: NITROUSN]
#2853598
11/30/20 10:40 PM
11/30/20 10:40 PM
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Joined: Jan 2007
Posts: 10,146 A Red State
SNK-EYZ
I Live Here
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I Live Here
Joined: Jan 2007
Posts: 10,146
A Red State
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Read back to what I told you. My bets are combustion is getting into the system causing the air. You can get a simple test kit to see if it is combustion gas. Test kit I agree, you may possibly have a head gasket issue. A compression test and a block leak test would help identify if that's the problem. Any idea if the water pump has ever been replaced? Make sure that the weep hole on the bottom of the water pump isn't seeping coolant. You said that steam was coming from below the engine. The wife's Charger was using some coolant slowly and it was the water pump weeping coolant very slowly.
Kayse can't keep up at all now. lol
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: NITROUSN]
#2853614
11/30/20 11:20 PM
11/30/20 11:20 PM
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Joined: Sep 2014
Posts: 1,408 Central Pa
moparjim79
pro stock
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pro stock
Joined: Sep 2014
Posts: 1,408
Central Pa
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Read back to what I told you. My bets are combustion is getting into the system causing the air. You can get a simple test kit to see if it is combustion gas. Test kit Thought I was going crazy, but im not. People are not reading responses posted. I shouldn't be surprised.
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: SNK-EYZ]
#2853625
11/30/20 11:53 PM
11/30/20 11:53 PM
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Joined: Nov 2020
Posts: 30 VISALIA
KcCrown
OP
member
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OP
member
Joined: Nov 2020
Posts: 30
VISALIA
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My shop put in 3 new heads and sealed it all up brand new 3 months ago. New water pump. New head. New gaskets all around. New new new. Everything ran beautifully for 5 weeks. Then the first over heat but bad thermostat. I replaced the thermostat and all was resolved,,, for 4 weeks when it over heated but the thermostat worked and showed what was happening. This is when l found out about air getting trapped and purging. So now lve been trying to resolve it through purging air, I agree that some of the behavior made me wonder about head gasket but.. it has full power, full pressure, no water oil mixing nothing else behaves head gasket leaking except the over heating itself. Yes when l idle , it gets hot down under the engine. It stems from down below the engine and then the reservoir gets too hot and boils and steams pretty quickly. Even before the thermostat says so. The thermostat almost seems delayed.
It also seems like when l open the thermostat port it resolves it briefly. Not permanently. This is why l kept thinking it was air.
So. Can l have a tiny head gasket leak that hides. ? That doesnt draw power. Doesnt mix water and oil and takes a few days to draw air into the system before there is an issue?
Last edited by KcCrown; 11/30/20 11:56 PM.
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: KcCrown]
#2853698
12/01/20 09:30 AM
12/01/20 09:30 AM
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Joined: May 2019
Posts: 6,291 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,291
nowhere
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My shop put in 3 new heads and sealed it all up brand new 3 months ago. New water pump. New head. New gaskets all around. New new new. Why are you even messing with it? Take it back to the shop and have them fix it.
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: Sniper]
#2853800
12/01/20 02:27 PM
12/01/20 02:27 PM
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Joined: Sep 2003
Posts: 19,534 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,534
north of coder
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has the radiator cap been replaced, or is it the factory original ? i have seen several caps that the seals were bad, allowing transfer of coolant into and out of the overflow, but also sucking air at the same time. look closely at the radiator sealing surfaces as well, making sure they are ok and not nicked up. lots of things to check, but you can do it !
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: KcCrown]
#2853809
12/01/20 02:46 PM
12/01/20 02:46 PM
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Joined: Jan 2003
Posts: 18,426 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,426
UPPER MICHIGAN, MARQUETTE COUN...
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So. Can l have a tiny head gasket leak that hides. ? Yes and for the last time you need to have a test for combustion gasses in the cooling system. A pressure test will show nothing until the leak gets real bad. Simple logic here so read and listen. Cooling system pressure is minimal. Compression pressure could be 10 to 20 times greater. So what will leak first? Coolant in the cylinder or gasses in the cooling system. Your problem is not rocket science. You most likely have never had a bad thermostat. The thermostat needs to be immersed in coolant to operate correctly. Air that traps on the spring side will not allow the thermostat to open as scheduled. Instead it allows the engine to get to warm and possibly overfill the recovery tank and blow out before it opens. Continual bleeding of the air is just a temporary fix until more air gets in the system. You should never need to bleed after initial bleeding after repairs. Get the test done.
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Re: Hemi 5.7 overheating after new thermostat and air purge.
[Re: KcCrown]
#2853929
12/01/20 06:20 PM
12/01/20 06:20 PM
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Joined: Nov 2020
Posts: 30 VISALIA
KcCrown
OP
member
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OP
member
Joined: Nov 2020
Posts: 30
VISALIA
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Ok. MAYBE found it.
I pulled the second thermostat in 8 weeks.... To test it on the stove. . I didnt believe it was that, because , seriously, 2 bad brand new thermostats in a row?? The more expensive one? Junk from the git go? But. It went up to temp, opened up and Stuck open. Froze in the open position. Removing it from the hot water, it refused to close back down. I had to force it to close l0ng after it cooled. So. I gotta assume a problem with the thermostat. This time I will but the gasket for it. In case there is any kind of air leak around the housing. And seal it up better on install.
Does everyone agree .. this could be what's wrong.? .
Bonefishmastr. When lm done putting in the new thermostat and using a gasket.. l am going to jack up the front to bleed it out. Maybe if l do all this stuff 100% on point . I can come away running like a champ.
Is there anything that can destroy thermostats? Just curious.
Last edited by KcCrown; 12/01/20 06:25 PM.
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