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Post by Penguin45 on Sept 14, 2013 16:23:44 GMT
The overflow tank is an essential part of the cooling system. It maintains the pressure although you may be able to transfer the pressure cap to the radiator instead, but as the engine warms up it pushes the water into the overflow tank and draws it back as it cools. It would work without it but I would do all you can to retain it. David I've never quite got the logic of this. Blank cap on radiator, overflow feed to pressure bottle makes sense. The pressure bottle on my car (and others I've looked at) have the inlet spout ¾ of the way up the side and the actual overflow in the neck. If water gets into the bottle, how can it get sucked back again when everything cools down? Chris. |
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Post by indianajones on Sept 15, 2013 2:16:13 GMT
I'm going to assume it's caused by pressure difference, how exactly I'm not quite sure!
Isn't the overflow tank on the ADO16 below the radiator?
-Andrew
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Post by dave1800 on Sept 15, 2013 2:24:24 GMT
The old Toyota Hilux circa 1995 here has the pressure cap on the radiator and feeds a header tank via a narrow rubber tube. The header tank is below the top of the radiator and its cap is a simple just about airtight plastic bung. It works keeping the radiator full, hot and cold - there is little discernible pressure in the header tank. The Landcrab reverses the cap arrangements but I see your point, it can only suck back again if the header inlet pipe is below the water level. It would seem to make more sense for this pipe to be towards the bottom. As it actually works, I can only assume there is either a feed pipe inside the header - I've never looked (unlikely complication?) or that it fills up quickly as the engine warms up. With this arrangement it is important that the rubber inlet feed pipe and connections are maintained in perfect condition or there will be loss of pressure and possible engine overheating. Also important to keep the header water level correct. The Toyota system seem better and more logical. The overflow tank is an essential part of the cooling system. It maintains the pressure although you may be able to transfer the pressure cap to the radiator instead, but as the engine warms up it pushes the water into the overflow tank and draws it back as it cools. It would work without it but I would do all you can to retain it. David I've never quite got the logic of this. Blank cap on radiator, overflow feed to pressure bottle makes sense. The pressure bottle on my car (and others I've looked at) have the inlet spout ¾ of the way up the side and the actual overflow in the neck. If water gets into the bottle, how can it get sucked back again when everything cools down? Chris. |
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Post by foglaursen on Sept 15, 2013 8:27:26 GMT
Yes, the is a pipe going to the bottom of the expansion tank. Cheers Peter  |
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Post by Penguin45 on Sept 15, 2013 15:12:59 GMT
Quite right, Peter. Now that I've gone and looked, the tube runs right down to the bottom. Should have done that in the first place......  Chris. |
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