Air getting into cooling system

Tiny
CAMC61
  • MEMBER
  • 2007 CHRYSLER 300
  • 2.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
Changed my thermostat after flushing system. After put back together I bled system through bleed valve until solid fluid. After I topped off system I drive car and coolant comes out under cap on overfill. Car gets hot after 10 miles.
I pull over shut off car and open bleed valve and lots of air comes out until finally fluid. I have done this 7 times and still coolant rises in overflow.
Please help. Thanks
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Thursday, July 16th, 2020 AT 3:00 PM

18 Replies

Tiny
KASEKENNY1
  • EXPERT
This is normally caused by a restriction somewhere in the system. If it wasn't doing this before you replaced the thermostat, just make sure you installed it correctly. I can't remember but I am pretty sure this only goes in one way to prevent you from putting it in upside down.

Then we need to use a laser temp gauge to check around the engine and cooling system to see if we have any hot spots as that would be a restriction. Check the radiator as well. Clearly you should have a decrease in temp but it should be gradual as you go down the radiator.

I just had a newer Jeep that was doing the same thing as this and we found the small return line to the overflow tank was restricted and it caused the tank to overflow and just a constant stream or air to come out of the bleed valve by the radiator.

Let us know what you find and we can go from there but I am pretty confident you have a restriction, we just have to find it.
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Thursday, July 16th, 2020 AT 3:49 PM
Tiny
CJ MEDEVAC
  • EXPERT
It sounds like you bled the system as it was possibly needed and maybe beyond.

Sometimes oil getting into coolant or coolant getting into the oil is a usually a sure sign that a head gasket failure may be the problem.

Sometimes overlooked is a head gasket failure in which combustion gasses (air/fuel and, or exhaust) pushes through the damaged gasket into the "compartment" shared by that portion of the head gasket. That might be oil or coolant, sometimes it spits out of the exterior of the engine into open air.

Here's a 2CarPros YouTube guide on how you can test for head gasket problems:

https://www.youtube.com/watch?v=5zpNjYmmiYY

Let us know what your findings are.

The Medic

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Thursday, July 16th, 2020 AT 4:04 PM
Tiny
CAMC61
  • MEMBER
There is no water in oil on the inside of filler cap and no water coming out tail pipe and engine run idles smooth.
It defies all logic. The block combustible check came up good no gasses in coolant.
This is throwing me for a loop.
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Thursday, July 16th, 2020 AT 4:45 PM
Tiny
KASEKENNY1
  • EXPERT
Let's check for a restriction in the system by checking the temperature around the engine and cooling system to see if there is a hot spot.
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Thursday, July 16th, 2020 AT 5:55 PM
Tiny
CAMC61
  • MEMBER
Okay, what do I need to do that I'll buy it?
I do know bottom hose on radiator is cool enough I can keep my hand on it It is pretty warm but top hose I can only touch it for a few seconds! I appreciate your help very much.
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Thursday, July 16th, 2020 AT 7:03 PM
Tiny
CAMC61
  • MEMBER
Oh and I just drove it 4 miles and when I came home I shut engine off and opened bleed valve and a lot of air came out for approximately 7 seconds the fluid! I did notice a little water came out of overflow tube on tank from cap I disconnected it from overflow and it did get water on air housing.
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Thursday, July 16th, 2020 AT 7:07 PM
Tiny
CAMC61
  • MEMBER
Okay, if your still there? I bought infrared thermometer, I took temperature after car warmed up: top hose 160 bottom 145 over fill tank 130 radiator bottom is 110 top is 128 side 120 other side 135.
In engine top of valve covers 140 132 exhaust 170 heater hose going in 135 coming out 90 heater is in off position
If I rev car to 2000 rpm's for 5 minutes a couple drips come out at recovery. Nothing like before. Maybe I'm getting air bubble out or radiator is little plugged! I'll check heater hoses when heater is on and post that.
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Friday, July 17th, 2020 AT 4:44 PM
Tiny
KASEKENNY1
  • EXPERT
Okay. Sorry for the delay. Those do not seem to be too bad so I would not think you have a blockage. However, I just thought that because this is a 2.7L it does have a bit of an odd process. I attached what needs to happen to ensure you don't have air pockets. Take a look at this and let me know what you find.
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Friday, July 17th, 2020 AT 6:05 PM
Tiny
CAMC61
  • MEMBER
Okay, I will try that procedure. After I checked temperatures I turned car off and opened bleed valve. There was little air that bled off I tightened bled valve and took car for little drive about 4 miles after return to home I shut off car and opened bleed valve it blew air out for 60 seconds. I had to open cap on overflow for fluid to be drained back into system! Then a good stream of fluid came out! And overflow was low! While driving I did get coolant out of overflow hose from cap.I just don't get it but I'll try this procedure tomorrow.
One question, if there is a very small leak at heater tube going into thermostat housing due to worn o-ring could that be culprit?
I did notice a very slight drip at anoit one drip per minute.
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Friday, July 17th, 2020 AT 7:58 PM
Tiny
CAMC61
  • MEMBER
Does it matter which one of the bleeder screws I bleed system? There is two
one in front on housing and one just behind it. I've been bleeding through the back one.
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Saturday, July 18th, 2020 AT 12:04 PM
Tiny
KASEKENNY1
  • EXPERT
The behind the housing would be correct. As for the leak, I doubt that will cause it but it clearly should be corrected.
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Saturday, July 18th, 2020 AT 7:27 PM
Tiny
CAMC61
  • MEMBER
Understand and I replaced the o-ring on the heater pipe and will now bleed system per the procedure you sent.I will let you know what happens.
Thanks
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Sunday, July 19th, 2020 AT 11:26 AM
Tiny
CAMC61
  • MEMBER
Okay, did just like you said in the procedure and still same. I'm puzzled, I put new cap on small tank and still it building little more pressure than the 18 lb cap and coming out the overflow hose while driving! Just a little.
I can buy a new radiator I guess and see what that does. For now I'm going to put thermostat back in and fill it and bleed it and go from there. Not sure what else to do at this point.
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Sunday, July 19th, 2020 AT 1:39 PM
Tiny
CJ MEDEVAC
  • EXPERT
If you have filled it to the top,

When it heats up, you (and all of us) will experience "Thermal Expansion".

In simple terms, your 2 gallons of water has turned into 2-1/8 (or so) gallons of water.

2-1/8 gallons will not fit into the 2 gallon space.

It will push out all that will not fit (down to the 2 gallons of hot expanded water that will fit)

You get home and go to sleep.

The water cools, in the morning you snatch off the cap, you are an inch or so low. Wild guess, you now have 1-7/8 gallons in there.

Take it down the road, the water is hot (and expanded). The "inch low" is now to the top, the water has expanded back to 2 gallons, the radiator is full.

As long as everything remains great and fine the water will not push out anymore unless you add some. Or you have some overheating.

Moral of the story, a little low is normal (you will learn as time goes on, looking into a cool radiator).

You still must "maintain" that level (cold)

I have made Popsicle sticks/ similar device with a mark on it to verify what my "normal" cold level should be, I would store them in a crevice in the hood's underside.

As with the oil, your owners manual says to check it "weekly". Performing all of your Jeeps scheduled maintenance will make him last forever!

You can mix your coolant 50/ 50 to 70/ 30

I always do 70/30 so that if I'm forced to add plain water in later, I'll still be with the tolerance!

Always mix the coolant correctly in vessels prior to pouring it in your Jeep. There is no "wrong" guessing doing it that way. No matter if you need 1 gallon or 10 gallons, now or later, the mix will always be right even with some still in the system.

The Medic
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Sunday, July 19th, 2020 AT 2:52 PM
Tiny
CAMC61
  • MEMBER
Thanks for the reply. I replaced radiator and problem solved! It was partially plugged.
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Monday, July 20th, 2020 AT 10:17 PM
Tiny
CJ MEDEVAC
  • EXPERT
That's some good news!

We appreciate you taking the time to give the thread some closure, other folks may benefit when they read your thread.

Be sure to come back!

The Medic
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Tuesday, July 21st, 2020 AT 12:39 PM
Tiny
CAMC61
  • MEMBER
Absolutely and thank you.
This is a great thread!
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Tuesday, July 21st, 2020 AT 5:01 PM
Tiny
KASEKENNY1
  • EXPERT
Just catching up on this one. Glad you found it. Restrictions in these systems cause all sorts of odd issues. As was mentioned, thanks for updating us. That info will surely help others. Talk to you next time. Thanks
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Tuesday, July 21st, 2020 AT 6:31 PM

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