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Old 04-20-2017, 10:54 PM
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Question Need Help with possible Aux Coolant bottle

Hello,

I have a 2012 Jeep Grand Cherokee. Recently I noticed an increase in engine temp from the winter. I also noticed the aux coolant bottle has increased to almost full. The engine temp also goes up quicker from start. The radiator is not full like it used to be. Every other morning I check it and its about an inch from being full. Is this the sign of a bad thermostat? There are no leaks I can detect under the truck.

Any help is greatly appreciated!!!


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Old 04-21-2017, 07:56 AM
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Re: Need Help with possible Aux Coolant bottle

You might want to have the water pump checked in addition to what you describe...
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Old 04-24-2017, 05:37 AM
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Re: Need Help with possible Aux Coolant bottle

Assuming it hasn't been done already, at 5 years you should be flushing and replacing your coolant anyway. Start with a flush and replace the stat while your there.
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Old 04-24-2017, 08:05 AM
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Re: Need Help with possible Aux Coolant bottle

Thank you! I took it to Firestone this weekend and they say there is nothing wrong based on their test. It passed all temp test. I will get it to the dealer this week to make sure. I think you are right.

Thanks
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Old 04-24-2017, 12:17 PM
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Re: Need Help with possible Aux Coolant bottle

bottle filling up and radiator not full usually means there is an air leak somewhere (not enough vacuum to suck the coolant back in)
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Old 04-24-2017, 01:27 PM
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Re: Need Help with possible Aux Coolant bottle

Is that common with Jeeps? Could that be the cap on the aux bottle?
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Old 04-24-2017, 01:32 PM
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Re: Need Help with possible Aux Coolant bottle

Quote:
Originally Posted by tomk View Post
bottle filling up and radiator not full usually means there is an air leak somewhere (not enough vacuum to suck the coolant back in)
And that leak could be a hairline crack in the overflow bottle [typically where you can't see it], the vent hole is plugged, or the small hose that goes to it has a crack... or the more expensive stuff, your radiator itself.

If you have a local radiator shop, explain what you are seeing to them... they tend to have more neurons than a tire dealer/general repair place.

Is your engine actually overheating?
Notable coolant flow to the bottle is unusual
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Old 04-24-2017, 01:50 PM
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Re: Need Help with possible Aux Coolant bottle

No the engine is not overheating. Just the aux bottle now stays almost full and the coolant in the radiator doesn't stay topped off.
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Old 04-24-2017, 04:28 PM
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Re: Need Help with possible Aux Coolant bottle

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Originally Posted by rburns515 View Post
No the engine is not overheating. Just the aux bottle now stays almost full and the coolant in the radiator doesn't stay topped off.
If you just leave the aux bottle full, and add coolant, does the bottle overflow?
Trying to figure out if you have a leak in the cooling system [those plastic radiators suck] or it is just moving coolant to the bottle, but can't generate enough vacuum to pull it back. All of that is controlled by the radiator, unless there is a small hole in the bottle or hose that leaks vacuum.

The cap on the bottle should have a small vent in it... can't see how it could get messed up, but worth checking.

You might be able to unhook the overflow hose from the radiator and use a long garden hose or similar to dump water into it and see if you spot any leaks along that hose. If it is limp at all replace it--may be collapsing.

See if you can find a radiator specialty shop instead of a general repair shop...

Will assume that the prior shop both pressure tested it and dye checked it under pressure. If not==incompetent.
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Old 04-24-2017, 08:05 PM
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Re: Need Help with possible Aux Coolant bottle

Your cooling system is a closed system and a cooling system pressure tester can be installed in place of the radiator cap to check for leaks. Pump the system up to the rated pressure on your radiator cap (18psi on 5.7L) and it should hold pressure.

When you start your Jeep and let it run, everything will heat up and the coolant expansion will create pressure, when it cools down, the pressure will go down. The radiator cap allows it to maintain a certain amount of pressure, before it goes into your overflow. When it cools down, it contracts and will pull the coolant in from the overflow. If this isn't happening, have your radiator cap checked or simply replace it.

I hope this helps
Michael Plummer
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Old 04-25-2017, 10:30 AM
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Re: Need Help with possible Aux Coolant bottle

Thanks all! I will replace the cap today and see what happens.
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Old 04-25-2017, 03:43 PM
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Re: Need Help with possible Aux Coolant bottle

Another thing to note, your cooling system needs to be air tight or it won'twork properly. Again, as engine warms the radiator cap lifts and sends heated-expanded excess water to recovery tank via hose from cap neck to recovery tank.When your engine cools and tank pressure decreases, excess water from hot rad captured in recovery will be sucked back into radiator via same cap thru and hose on cap neck.

So when operated and maintained properly, the radiator will always be totally full and level in tank will never be dry when cold, nor above full mark when hot. Thats why recovery tank is vented whereas radiator is not. The level in recovery tank is expected to change and should as engine water temp changes which is very important.

I hope this helps
Michael Plummer
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