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Old 03-29-2016, 01:06 PM
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Reservoir full - Radiator Empty

Hi all,

So today my jeep started to overheat after a few minutes of driving, steam coming out of the grill/hood. After it cooled , I noticed that the coolant reservoir is full but the radiator is dry. What could be the reason for this ? I filled up the radiator with any coolant I had and so far it runs fine, tough I fear this wont last long.

Thank you

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Old 03-29-2016, 01:33 PM   #2
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Most likely air getting into the system. check your hoses and clamps to ensure they're in good shape, no leaks, and proper tension.

Check your oil for coolant. Hopefully not a head gasket issue.

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Old 03-29-2016, 03:05 PM   #3
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Replace the radiator cap, it's what regulates flow between the radiator and overflow bottle. Then figure out why you were/are losing coolant, unless you happened to have just serviced the cooling system, in which case it was probably just trapped air that couldn't normally escape out the overflow bottle because of the bad cap.
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Old 03-29-2016, 03:10 PM   #4
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The coolant went somewhere, either its leaking, into the engine, or outside of the engine, or boiled off and vacated the cooling system through the cap. With regard to the reservoir did you check to make sure the hose to it is not clogged up?

I'd get a pressure tester wait for the engine to cool off, make sure the coolant level is full and pressure test the system. I'd also check the radiator cap for proper function.
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Old 03-29-2016, 05:50 PM   #5
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Cap until proved otherwise

If cap does not hold system pressure it boils sooner overflow goes to revisor until full then leaks out and down to road

Then as cools instead of pulling back from revisor the leaky cap lets outside air in and system not refilled and overflow stays full
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Old 03-29-2016, 07:20 PM   #6
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One more possible thing is a blown head gasket. I had this happen on another car. It pushes exhaust gases into the cooling system and over pressurized it. It will then push water out of the radiator. But if you filled it and it is fine then I would go with the cap.

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