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Overflow Reservoir Question


 
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swataz
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Joined: 22 Jan 2008

PostPosted: Sun Jan 27, 2008 3:36 pm    Post subject: Overflow Reservoir Question Reply with quote

I own a 1999 Grand Cherokee and am having some heat issues.

The question I have right now is about the coolant overflow reservoir. When the car is cold, should it be below FULL and should it rise as the car's temp increases to running temperature?

Currently, mine stays at the same FULL level at all time, neither dipping or rising. Is this abnormal?

Thoughts anyone? Thanks.
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Orangeamc13
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Joined: 20 Feb 2006
Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Sun Jan 27, 2008 7:56 pm    Post subject: Reply with quote

It's ok!
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swataz
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Joined: 22 Jan 2008

PostPosted: Mon Jan 28, 2008 11:07 am    Post subject: Reply with quote

Thanks!
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georgeda
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Joined: 02 Oct 2007

PostPosted: Mon Jan 28, 2008 11:21 am    Post subject: Reply with quote

When absolutely cold and on level ground it should be exactly at the full line. After a good run and temperature where it normally runs it should be slightly above the full line. As the engine cools down the level should go back to the full line.
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swataz
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Joined: 22 Jan 2008

PostPosted: Mon Jan 28, 2008 1:21 pm    Post subject: Reply with quote

georgeda wrote:
When absolutely cold and on level ground it should be exactly at the full line. After a good run and temperature where it normally runs it should be slightly above the full line. As the engine cools down the level should go back to the full line.


Well let me give some backstory here - the water pump, thermostat, lines etc, were all replaced on this thing last fall.

Whoever did the job left the level in the overflow at slightly above FULL.

This level, even after getting up to running temp does not move one iota.
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RussellRowell
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Joined: 09 Feb 2006
Location: Jacksonville Florida

PostPosted: Mon Jan 28, 2008 5:02 pm    Post subject: Reply with quote

Have you replaced the radiator cap? Maybe the cap is the wrong one or the seal is bad. White deposits around the radiator filler neck means leaking cap. The only way your resevoir level would rise when hot is by the radiator cap spring giving way to allow high pressure from heat expansion to push coolant to the resevoir to make it rise. You might want to replace it just to see if it's the problem considering it's inexpensive. This simple device can make a huge difference in your cooling system. GL
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Orangeamc13
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PostPosted: Mon Jan 28, 2008 11:09 pm    Post subject: Reply with quote

If the radiator cap is removed and the coolant is at the top of the neck (full), then there is no need to worry at all. If the coolant level in the radiator is down then there may be an issue.
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swataz
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Joined: 22 Jan 2008

PostPosted: Thu Jan 31, 2008 8:08 pm    Post subject: Reply with quote

The coolant level is not at the tippy top, it is visible though when I remove the cap.
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georgeda
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Joined: 02 Oct 2007

PostPosted: Fri Feb 01, 2008 4:10 am    Post subject: Reply with quote

swataz wrote:
The coolant level is not at the tippy top, it is visible though when I remove the cap.

You either still have air in the system or you have a leak and are losing coolant. With a full - all the way to the very top of the filler neck - radiator the coolant will expand when it reaches normal operating temperature. If a good and correct cap is being used the pressure will push the spring seal of the cap off its seal and let the expanding coolant flow into the overflow bottle, thus raising the level in the bottle.
One exception would be that your enging is not reaching the normal operating temperature, which might mean your cooling system - radiator - is way oversized or the thermostat does not regulate the coolant temperature so it will reach the correct temperature.
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Orangeamc13
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Location: East Springfield, Massachusetts - U.S.A.

PostPosted: Fri Feb 01, 2008 9:33 am    Post subject: Reply with quote

Top off the radiator and run the Jeep, then you'll be able to tell if the overflow level is changing. Topping off the radiator should send some coolant to the overflow and the level should go up. Or you could suck some coolant out of the radiator with a turkey baster or whatever you like. Then the level in the bottle should drop to accomodate the loss in the radiator. If neither of these work , then you probably do need a new rad cap.
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