Question about 1986 Isuzu Trooper

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Finding the drain for the radiator - 1986 Isuzu Trooper

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The drain on my 1986 is at the rear of the radiator at the very bottom on the passenger side. It is a plastic threaded plug about 1/2 inch in diameter. You can open it with a pair of pliers. It will be difficult to see with the fan shroud in place. The fastest way to drain the radiator is to disconnect the lower radiator hose. Do this when the engine has cooled completely or you risk a serious burn.

Posted on Mar 03, 2009

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I've a 1986 Trooper and the radiator drain has yet to be found.

With the engine cold drain the water via the lower hose. Reconnect the hose then add water run the engine until warm to hot, opening the thermostat. Turn engine off and pull the hose again to drain the water again it should still be dirty as in rust. you may have to repeat a few times, when the water drains clear then put antifreeze and top off with water. Be sure the hose is clamped tight and no leaks.

John

Posted on Jul 30, 2008

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