Does water evaporate out a little on a non pressurized radiator that sits out in the hot son all the time or can loose some to evaporation when the tractor is hot from use for some time? My Farmall A is down a bit of fluid and I don't find it anywhere like on the ground or in the oil. More curious than concerned.
- Thread starter Charlie M
- Start date
Richard G.
Well-known Member
I would think it would evaporate some just like any liquid would in a container that is not sealed up.
Janicholson
Well-known Member
Yes it can loose a bit from evaporation. The radiator should only be about an inch above the core tubes when cold. if near full, it will push some out. don't over fill it. Jim
Dieseltech
Well-known Member
- Location
- Akron, Indiana
The 50/50 antifreeze mix will evaporate too, but slower than just plain water does in a non pressure system.
Fritz Maurer
Well-known Member
Not knowing what you mean by low, i would fill it all the way up, if your A has no water pump, and let it push out the excess when it gets hot. Thermo-siphon will not function correctly if there is an air gap at the top of the system.....the engine will have to boil the water to get it into the radiator. With a solid column of water, the coolant can circulate any time there is a temperature difference between the block and the radiator.
Janicholson
Well-known Member
With no flame intended, the manual indicates as I said. the thermosiphon depends on heavy cooler water, and lighter hot water. it does not need to be full to operate. I know the coolant will expand about a pint and a half. Plenty enough to operate. Jim
redforlife
Well-known Member
It can, but a more likely scenario is, the excess was pushed out when the tractor reached operating temperature. When cooled down, it would be low of the amount it pushed out. This would include all thermosiphon systems, along with the pressurized systems that had no overflow reservoir (just an overflow tube that would drain it out on the ground).
That was the purpose of the overflow reservoir, whenever they started doing that. It would capture the excess overflow, and the system would suck it back in upon cool down. The system would remain full at all times (if working correctly).
On thermosiphon systems, it's important that it doesn't get any lower than the top of the radiator core (the tubes). System requires fluid to be above those to work. Not quite as critical on a system that has a water pump to pump it over the hill so to speak (if it's really that low), and still somewhat function, but you really don't want to be that low on those systems either, even if you have that little bit more leeway of being low.
A radiator as full as possible, equals happy camper.
That was the purpose of the overflow reservoir, whenever they started doing that. It would capture the excess overflow, and the system would suck it back in upon cool down. The system would remain full at all times (if working correctly).
On thermosiphon systems, it's important that it doesn't get any lower than the top of the radiator core (the tubes). System requires fluid to be above those to work. Not quite as critical on a system that has a water pump to pump it over the hill so to speak (if it's really that low), and still somewhat function, but you really don't want to be that low on those systems either, even if you have that little bit more leeway of being low.
A radiator as full as possible, equals happy camper.
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