4WD Radiator - Is the second radiator always in use?

[89MasterAce]

Hello all,

So I have the second, horizontal radiator below my AC condenser. Is the second radiator always in use once the thermostat is open? Is there any valving or additional thermostat between the second radiator and the main radiator?

[Jean-Claude Van-chan]

As far as I know, that second 'horizontal radiator' is the evaporator for you air-con, not a second motor radiator, and they do not share fluids.

[89MasterAce]

On my van, there is the horizontal AC condenser in the normal place, and directly below it is a second motor radiator. Here is the diagram for the second radiator.

[Jean-Claude Van-chan]

My learning curve just tipped back to vertical

[Andywear]

I drained my whole system from the horizontal one, I feel if there was valving it would not have drained or refilled properly. Make sense?

[Doxy]

Anymore information on this? I seem to have the second radiator as diagramed but am trying to find out if it runs in series with the main radiator or separate

[Headhunter38]

On my van, there is the horizontal AC condenser in the normal place, and directly below it is a second motor radiator. Here is the diagram for the second radiator.

Where did you find this diagram? I dont see it anywhere in my BGB or anywhere on toyotaparts.com. I also have a 4wd and theres no second radiator on mine.