So I have 1995 4Runner with a 3VZE engine. I just recently had the motor installed, it is a used motor with 80,000 miles . Ever since the install the radiator seem to lose all fluid out of radiator. It does not seem to be a head gasket leak. Hose were replaced when engine was installed , also water pump ,timing belt and valve covers replaced before install. All belts replaced also. Radiator was flushed several times to get out anything stuck in radiator. Need advice on where water might be leaking. Can't find location. Going to replace radiator cap also, but does not leak from that area.

 

You should be able to see it somewhere if its leaking out.

 

Get the test kit. Pressurize the system and wait. If the pressure drops it went somewhere, if there isn't a puddle it is still in the engine.

 

^^^^ what he said, get a pressure tester if you're losing pressure keep pumping it back up. if you don't see coolant on the ground or the passenger floorboard (heater core) then pull the spark plugs and look for coolant coming out when you turn the engine over by hand (head gasket or cracked head) if you don't find any there pull your oil pan drain plug and see if coolant comes out before you get oil (oil floats) this would indicate a cracked block. the only other place to look is inside the intake which could indicate bad gaskets or cracks or mixed up hoses.

 

Well, a crack in the right place in the head can leak directly to the exhaust as well. If your exhaust system is in good shape (no leaks) it can hold a fair amount of coolant. You will see it, though, as soon as you start. A big white cloud!