closed loop system
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Postmaster
Joined: Jan 2010
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From: Elk City, OK
closed loop system
anyone think about running a closed loop cooling system in their truck? i hate my dads cause i cant get directly into the radiator, but i love it cause i know its always full just by looking at the tank, and its a million times safer to remove the cap under heat and pressure.
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Postmaster
Joined: Jan 2010
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From: Elk City, OK
your radiator doesn't have a cap. There's a hose that runs to a tank, basically a overflow tank, but the pressure is stored there. You full your radiator through it. They run them on 99+ diesels. Not sure what else, I know older vw's ran them too. So you never have to wnder about your coolant level, if the tank is full then your radiator is too.
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
your radiator doesn't have a cap. There's a hose that runs to a tank, basically a overflow tank, but the pressure is stored there. You full your radiator through it. They run them on 99+ diesels. Not sure what else, I know older vw's ran them too. So you never have to wnder about your coolant level, if the tank is full then your radiator is too.
Any real advantage to the system? I guess its less prone to sucking air in at the rad cap. Had a problem like that once on another vehicle and for a while I suspected a head gasket.
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Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
Closed systems are done to give the ability to relocate the highest point in the cooling system.
Many of todays vehicles the top of the radiator is lower than other parts of the cooling system, this causes vapor locking in those high points.
-Enjoy
fh : )_~
Many of todays vehicles the top of the radiator is lower than other parts of the cooling system, this causes vapor locking in those high points.
-Enjoy
fh : )_~
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Joined: Jul 2009
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From: Hartland CT
i know my 1987 jeep cherokee has the closed loop system and i think its just a big pain in the rear end, you have to "burp" the system anytime you change a hose or thermostat or an air bubble gets caught in the thermostat so it wont open and it overheats like crazy....not fun
Lead Driver
Joined: Dec 2006
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From: So. Jersey
i know my 1987 jeep cherokee has the closed loop system and i think its just a big pain in the rear end, you have to "burp" the system anytime you change a hose or thermostat or an air bubble gets caught in the thermostat so it wont open and it overheats like crazy....not fun
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Postmaster
Joined: Jan 2010
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From: Elk City, OK
a lot of thermostats have them anymore. even the one for my camaro has one. still looking for the parts. guy in town has everything minus the fan i want. if i buy it, id install a set of dual electric fans for it.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
One thing that is bad about a closed system.
If your head gaskets start leaking compression into the cooling system, the radiator can be very low on coolant and the tank full.
So you think the radiator is full, when it really is not.
Just sent through that with a mini excavator last fall.
Had to take several body panels off to get to the radiator to remove the cap to see an empty radiator.
No wonder the engine temp was always so high.
If your head gaskets start leaking compression into the cooling system, the radiator can be very low on coolant and the tank full.
So you think the radiator is full, when it really is not.
Just sent through that with a mini excavator last fall.
Had to take several body panels off to get to the radiator to remove the cap to see an empty radiator.
No wonder the engine temp was always so high.
Posting Guru
Joined: Aug 2006
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From: Perry Georgia
My 1985 VW Diesel Jetta has one of the closed loop systems. Works for me. I haven't had any problem burping the system, in fact when I replaced the radiator I just filled the overflo tank till it was to the full mark and started it up. I had to add some coolant after the first run but haven't had to add any since. With the overflo tank being above everything I can tell if the coolant is going down when I stop.