Radiator Problems
Radiator Problems
Senior User
Joined: Nov 2009
Posts: 301
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Sounds normal as long as at isn't over heating. My truck does not have an over flow tank, and it automatically lowers the level to about a quart and a half low.
A bad radiator cap will cause a vehicle to over heat.
A bad radiator cap will cause a vehicle to over heat.
Senior User
Joined: Nov 2009
Posts: 301
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What do you mean by that? Is it just puking all the coolant out? If so will it do that on a cold engine? Is it over heating? Does it have to get hot before it overflows?
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
As suggested first check or replace the cap. Sounds like you may have some other issues if the cap doesn't fix it.
The fins on the pump could be rotted off, the complete system could need flushing professionally.
Do the cap thing and post back.
John
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Junior User
Joined: Aug 2010
Posts: 68
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From: South Dakota
I just had it flushed in August. And it does it before the temp gauge even gets to warm. I'll get myself a new cap from lmc and let ya'll know.
Jon
Jon
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Junior User
Joined: Aug 2010
Posts: 68
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From: South Dakota
Ok New symptom. I put the new cap on and it still started filling. But this time I stayed in the truck and watched the jug filling from inside and also monitored the temp gauge. Well as the jug filled the temp went up, but all of the sudden the gauge dropped back to a normal level and like almost instantly it drank all the antifreeze back up. 
Logistics Pro
Joined: Jun 2003
Posts: 3,919
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Ok New symptom. I put the new cap on and it still started filling. But this time I stayed in the truck and watched the jug filling from inside and also monitored the temp gauge. Well as the jug filled the temp went up, but all of the sudden the gauge dropped back to a normal level and like almost instantly it drank all the antifreeze back up.
Logistics Pro
Joined: Jun 2003
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It's normal for the radiator cap to allow coolant out the overflow when the coolant thermally expands. If you didn't have the overflow container the radiator would only puke out so much and then your coolant level inside the radiator would remain an inch or two below the radiator opening when cold but since you have the overflow container the radiator will expel the expanded liquid and draw it back in as the engine cools.
Logistics Pro
Joined: Jun 2003
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If you have a temp probe or gauge you can put it into the radiator opening and see at what temp the thermostat opens (just make sure you drain some coolant out of the radiator first to allow for expansion with the cap off). Or you can remove the thermostat, put it in a pan of water on the stove and boil it and measure at what temp the t-stat opens.
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