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Discussion Starter #1
I have a coolat leak (I thought was a power steering leak). Every morning theres a trail of fluid on the ground. I checked the radiator and its full. The coolant reservoir level was low (empty one day). I added coolant. Anyone know whats going on? Thanks
 

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A very common leak point on commanders is the two t-connections at the firewall on the passenger side where the heater lines pass through to the heater core. The connections get weak and will frequently leak there. I would check there and also the water pump. Sometimes it is difficult to determine the exact leak point as the leaking coolant can migrate all around as it drips. What may look like a leak from a water pump may not always be from the pump shaft or weep hole in the pump.

I replaced my heater hoses with Goodyear replacement hoses with tees swaged in place with metal crimp connections rather than the OEM plastic clamp type that loosen with time. When these connections leak the dripping coolant tends to follow the hoses down and under the vehicle.
 

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Brass, Copper, Bronze and Solder is NOT protected by OAT anti-freeze and will corrode. So if your connector were made from or use those metals it is even more critical you use the Recommended HOAT type anti-freeze. Most of the aftermarket anti-freeze being sold on store shelves, that does NOT identify what type of anti-freeze it is, and even worse implies its some sort of universal anti-freeze, is actually OAT anti-freeze. Zerex G-05 is the aftermarket equivalent of Chrysler's/Ford's/Mercede's HOAT. Its died Ford's Amber, but all three used the exact same anti-freeze when they used HOAT, just died different colors.
 

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The photos do NOT follow the wet areas upwards toward their source.

As the fluid leaks it will drain downward because of gravity and spread out collecting at the lowest points where it will drip off.

So the way to find the source of the leak is to follow the wet area up to the highest point, and that would be the source of the leak.

Or, you can start from the top and work your way down, the highest point you find a wet area beginning is likely the source of the leak.

Photos of the lowest points where the coolant is dripping off are just about worthless.

You don't have enough photos of the upper area where the leaks could be beginning. As well, photos of the Water Heater Core hoses and their "T"'s would be helpful as well.

Only one photo, does seem to show the wet area goes up to the water the pump, but there are NOT enough photos to confirm that. Regardless with that guidance, you should be able to inspect the engine yourself and find the leak as well as any of us doing it with photos.
 

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I had a coolant leak on my Commander once upon a time.....turned out to be nothing more than a bad radiator cap.....sounds simple enough but it was not easy to trace at all - because you don't see it dripping down from the radiator cap because a slow leak/drip rapidly evaporates due to the heat of the radiator. You only see it where it accumulates, at the bottom of the engine and on the ground.

I initially thought the same thing as the original poster....that the small puddles I was finding was power steering fluid (still used to the old green anti-freeze not the new orangey stuff)....but it turned out to be coolant dripping all the way down from the flipping radiator cap. I pulled my hair out with that one for about 3 weeks......
 

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I just had to replace my water pump today. I noticed it dripping on a trail ride over the weekend. Mine was dripping center of the engine on the plastic shield. Once I got it off the weep hole was obviously leaking, but also my thermostat housing was leaking. New water pump, thermostat and seals fixed it. Took about an hour to replace, but took another hour to get the stupid air pocket out of the system.
 

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Discussion Starter #8
ive checked around the radiator cap and heater hoses and cant find a leak anywhere except at the bottom of engine (water pump?).
 

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You may need to put it up on a rack to see clearly and I would do a cooling system pressure test. This can show you where the coolant is leaking from. You can pickup a pretty decent pressure tester at Harbor Freight if you want to do the test yourself. I have one and it works well.

Did you fill the coolant and let it idle until warm and look to see if you can see where it drips? It is interesting that in the photo of the heater hose tee it looks like there is a spray pattern of some kind behind the tee the looks like something was spraying out of the tee connection. Many leaks do not show up until the coolant is warm and the system has pressure in it.
 

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You are probably not going to be able to see it from the top. Get a flashlight and get underneath and look up at where the bottom radiator hose attaches to the waterpump. Once I did that it was pretty obvious that my waterpump was leaking. But you cant tell at all from the top.
 

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Trying to get good photos that we can tell the source of your leak is quickly turning into a waste of time.

In a few photos, I can see the wetness just below the water pump, can't see any higher. It is looking like you water pump is the source of the leak.

BUT, you're going to have to get in there close with bright light and figure it out on your own, look all around that water pump. I know its tough, the pulley wheel obscures just about all of it, that is why the pictures are just about worthless in us helping you.

Again, what I like to do and does help, clean that engine and entire engine compartment thoroughly, let it dry. Then start looking every time you drive for the leak. What you have right now is one big wet mess, and you're trying to figure out where the tiny point in that one big wet mess is the source of the leak. Clean up that one huge wet mess, dry it out, and then watch it closely, it will start to leak again it will start out as one tiny little wet spot, there you have the source of the leak.

Take off the splash shield under the engine, simple green is my favorite degreaser, use a brush for the stubborn or built up crud spots. Clean up the splash shield, you should be ok leaving it off for a few days. Spray down the whole motor with simple green, from above and below (be careful about Simple green in your eyes), scrub where needed. Hose it all out, let it dry.

Then go back and check before after each drive, looking closely for where the leak starts.
 

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The first picture in your second picture post shows your thermostat housing with a drip on it. If it were me I would plan on a new waterpump and thermostat.
Whenever I replace the coolant, I also replace the thermostat and its gasket and the pressure cap.

To replace the thermostat later, will cost more in new anti-freeze than the thermostat itself, a lot more. Especially in the Commander, the 3.7L and 4.7L have the thermostat at the bottom of the cooling system, you'll lose most of the coolant as you take it apart. NOT sure where its located on the Hemi.

Pressure cap can be replaced anytime, easily and NOT loose any coolant in the process. But the pressure cap doesn't last the life of the vehicle, they are only a couple of bucks and so I replace it as a preventative measure every time I replace the coolant.
 

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Discussion Starter #14
ive noticed it only leaks when it sits for long periods of time (overnight). when I driving a lot I check to see if its dripping and so far nothing. ill clean the engine tomorrow and take plate off
 

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Its probably a slow leak, it would have to be if the level of your cooling system is barely going down. With a slow leak, while the engine is hot, it will evaporate the leaking coolant off into the air, after the engine cools it will collect drain down to the lowest point and drip off.

Its rare, but some leaks, the pressure of the hot coolant system would help seal it, but it opens when there is no pressure when the coolant is cooled off and low pressure. The lip seal on the shaft of a water pump is more likely to do that, then say a pin-hole in a hose.

Again, the water pump has a weep hole at its lowest point or the lowest point of the protrusion that houses the shaft. If you can see that weep hole looking around the pulley wheel mounted in front of it, and that weep hole is dripping coolant, your water pump is leaking and needs to be replaced.
 

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Have them do the thermostat and thermostat housing seal while they're at it. I replaced my fan clutch and water pump last year, now I have a small leak at the thermostat housing. It's just a PITA to drain the coolant again just for that!
 

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I had the same thing! It drove me crazy! It ended up being the thermostat! The thermostat has a rubber gasket that is attached to it and it dried up and developed a cracked just enough to leak where I couldn't really see it.
 

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Bumping an old post because its' relevant to the information I'm trying to find.

Vehicle History

2006 Jeep Commander 5.7 Hemi Limited 4X4 with Front & Rear heating zones. 300,000 KMs...
Head gaskets were replaced 80,000KM ago ( 1.5 years). Typical blown head gaskets to to the passage ports corroded through. Had a slow coolant leak ever since.... was minor and never bothered to fix it since I could ad fluid once monthly to fix. Oil looks good -- no coolant in the Oil.

I'm having some major cooling system issues as of late. I believe it is 2-part.

1) Cooling system

2) the power steering / hydro static cooling fan system (Probably a random coincidence and I believe that both are failing at the same time). I dealt with the hydro static / Power steering / Cooling fan issue one on my Jeep Grand Cherokee once -- huge PITA.


I'm currently having a coolant leak issue. Showing signs of a leak at the heater core hose "T" next to the firewall. But also have coolant on the passenger floorboard at random -- this does not happen every time I park the vehicle. Only a couple times a month. But it is coolant and not rain water from the sunroof drain (another issue I've already corrected). Also, the heater core "gurgling sounds" during cold start-up. This alone tells me that air is getting into the system somewhere. Hoping It's not the actual heater core (What a royal PITA that would be to repair).

I quickly checked the Radiator cap -- it's also toast. The deal is almost completely disintegrated.

Anyways, I'm posting here because I source the "Goodyear heater core hoses" mentioned n a previous post

A very common leak point on commanders is the two t-connections at the firewall on the passenger side where the heater lines pass through to the heater core. The connections get weak and will frequently leak there....

I replaced my heater hoses with Goodyear replacement hoses with tees swaged in place with metal crimp connections rather than the OEM plastic clamp type that loosen with time. When these connections leak the dripping coolant tends to follow the hoses down and under the vehicle.
Anyone know of a source I can purchase these online or eBay? I'm located in Canada and would like to find a way to mail-order these replacements in.
 
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