Water Leak upper or lower hose
Water Pump Failure
Thermostat Stuck in Closed Position
Blown Head Gasket
Fit new radiator cap
failed Heater core
Bad radiator fluid.
you have to put the radiator fluid in the overflow. This is the only way.
Coolant is added to the overflow bottle instead of the radiator. The overflow bottle will allow fluid to fill over into the radiator.
In a radiator, the fluids get really hot, when things get hot they expand and then they have to go somewhere, the fluid goes into an overflow.
dexron 3
bad radiator cap
40wt transmission fluid 40wt transmission fluid
To flush the radiator on a 1991 Subaru Legacy, first ensure the engine is cool and remove the radiator cap. Place a drain pan under the radiator and open the drain valve to let the old coolant flow out. After draining, close the valve and fill the radiator with a flushing solution or water, then run the engine for about 10-15 minutes with the heater on to circulate the fluid. Finally, drain the flushing solution, refill with fresh coolant, and check for leaks.
Unfortunately, you need to pour the transmission fluid into the dipstick hole. Found in Subaru owners manual
The recommended automatic transmission fluid for a 2000 Subaru Outback Legacy is Subaru ATF HP. This is a proprietary fluid which is sold by local dealerships.
There is just an overflow container, no radiator cap. Remember, pink or blue fluid only.