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Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: SNK-EYZ] #2853545
11/30/20 07:30 PM
11/30/20 07:30 PM
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It doesnt seem like a thermostat or a leak. Pressure is fine. It's under full pressure.
Fluid doesnt go anywhere except through the engine when heated up. The thermostat opens and the fluid drops.
It seems like l must have air trapped and it is taking many times to bleed it all out possibly. ? I am hopeful this is all that is happening. But lm unsure yet.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: BB14404SPD] #2853550
11/30/20 07:35 PM
11/30/20 07:35 PM
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Yes. This is what lm doing. On the 3rd time now

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: stumpy] #2853557
11/30/20 07:42 PM
11/30/20 07:42 PM
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Initially, I overheated and had NO TEMP on the gauge dash at all. Total thermostat failure. Changed it and had no problem for 4 weeks. Then acted like l had air trapped. My cousin purged the air out the hose housing until it was almost fixed but not 100%. I then changed thermostat again in case l had a bad one... and everything seemed resolved for 3 weeks until a sudden over heat... so l went back to trying to purge and could get the Allen bolt to turn at first so l opened the thermostat up and filled it till it poured from there and it resolved again... then suddenly several days ago it overheated again. I finally got better leverage on the allwn bolt to purge air and am on my 3rd time purging air from there. It does have air when l open it, so ... l continue to purge it

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853561
11/30/20 08:10 PM
11/30/20 08:10 PM
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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 08:14 PM.
Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853574
11/30/20 08:49 PM
11/30/20 08:49 PM
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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

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: NITROUSN] #2853598
11/30/20 09:40 PM
11/30/20 09:40 PM
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Originally Posted by NITROUSN
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


iagree

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
Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: NITROUSN] #2853614
11/30/20 10:20 PM
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Originally Posted by NITROUSN
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.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: moparjim79] #2853624
11/30/20 10:47 PM
11/30/20 10:47 PM
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Oh no worries at all . I'm not offended. I work on my own car only up to what lm able to diagnose and comprehend a s learn to do. After that l seek professionals. This SEEMED like a resolvable issue initially. But as l go, l am wondering what's really going on here.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: SNK-EYZ] #2853625
11/30/20 10:53 PM
11/30/20 10:53 PM
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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 10:56 PM.
Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: moparjim79] #2853629
11/30/20 11:02 PM
11/30/20 11:02 PM
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Not sure why l sound upset. I'm not at all. I'm totally good. I appreciate everyone input. That's why l came here. I am no mechanic and appreciate all the information. I guess sometimes typing reads different than how the person actually feels in their mind? Lol.. regardless. Dont worry about me. I am good. Keep sharing experience and info and l will keep trying ideas and trouble shooting with more information. Thanks.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: moparjim79] #2853630
11/30/20 11:05 PM
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Ok. Tomorrow a pressure tester. Sounds good. Will do. PARTS STORE maybe loan with deposit. Sounds good. That will answer that question. Makes sense

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853663
12/01/20 06:39 AM
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if it pressure tests good try jacking up the front of the car and do your bleeds again

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853698
12/01/20 08:30 AM
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Originally Posted by KcCrown
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.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: Sniper] #2853800
12/01/20 01:27 PM
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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 !
beer

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853809
12/01/20 01:46 PM
12/01/20 01:46 PM
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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.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: Sniper] #2853885
12/01/20 04:09 PM
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That doesnt help what so ever.

The answer is ... all that work cost 2grand and they will gladly charge me 130 an hour again. I needed to Try to resolve small issues on my own and fix small problems without purging cash out my ass. THATS WHY .
now that we are past that. Back to what's letting air in.
I have also read today that air can seep in around the Thermostat gasket area.. putting the thermostat in without and Gasket or goop in the seal can leak? Air can draw in there.
It does seem to pull air from somewhere without it being a big draw. Something small is allowing small amount of air into the system.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: NITROUSN] #2853890
12/01/20 04:16 PM
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I think it's funny you are irritated. If you are cool assisting with information Thanks. If l am too stupid for you, Go away. Simple. Dont bother yourself. Lol. Crack me the hell up. I am A perfectly smart guy who has trouble shot this pretty easy. I grasp what everyone has said and lm working through the input one thing at a time and giving the car a chance to show me what is really happening, assuming nothing. I Am grabbing a pressure tester today. You say it should need to be bled very much yet people who also appear to have experience have shared that it can take all afternoon and several times bleeding and warming and bleeding which is time consuming. Requiring patience on my part while l look here for more information.
Based on what's happening with the car, l am more and more leaning towards a small leak right around the thermostat port. Where the pipe seals up behind the thermostat, could need a little gasket glue and not using anything right there might be allowing a tiny leak . It could potentially be that simple. There are several possibilities. And lm patiently working through each thing one at a time

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: moparx] #2853892
12/01/20 04:18 PM
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I agree. It might be pulling air in a very simple place like this. I am working down a short list of these ideas. I appreciate everyones help.

Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853929
12/01/20 05:20 PM
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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 05:25 PM.
Re: Hemi 5.7 overheating after new thermostat and air purge. [Re: KcCrown] #2853944
12/01/20 05:48 PM
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If it were me I would use a mopar t stat.

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