Coolant recovery system
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Joined: Feb 2004
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From: Orange County California
Coolant recovery system
Problems with the coolant recovery system. The coolant does leave the cooling system and goes into the coolant recovery tank. But, it does not completely return to the cooling system as the engine cools down. There is always just a little more coolant needed to top off the "radiator".
I have discovered that if, when the engine has cooled down,I slowly twist the radiator cap toward the off position coolant slowly returns to the radiator from the coolant recovery tankand it does top off the cooling system. But, if I twist the cap off fast, no coolant returns to the radiator and it is not topped off.
I have replaced the radiator cap twice and this did not fix the "problem" (if it is a problem). I don't like the fact that there is air remaining in the cooling system after the engine cools down.
The recovery system used to work perfectly until I took the car to the dealer to have a freeze plug replaced, then another freeze plug replacedand then the rear heater core replaced. Since then the coolant recovery system is not working properly. They did flush the system and put on a new radiator cap (I wish I had requested the old parts then I would have the original radiator cap). The radiator was just replaced. (Luckily under the after market warranty.) It seems that this vehicle has a cooling systemcorrosion problem. I am expecting a cylinderhead corrosion problem next. They are aluminum aren't they?
This raises another question. The dealer says the pressure rating of the radiator cap should be 21 psi. The Haynes manual says 18 psi. The local parts store (Kragan) says it should be 20 psi. I can't locate the pressure rating in the FSM. What is the correct pressure rating for the cap? Does anyone know? It's a 2001 Dorango V8 4.7 Liter engine.
I have discovered that if, when the engine has cooled down,I slowly twist the radiator cap toward the off position coolant slowly returns to the radiator from the coolant recovery tankand it does top off the cooling system. But, if I twist the cap off fast, no coolant returns to the radiator and it is not topped off.
I have replaced the radiator cap twice and this did not fix the "problem" (if it is a problem). I don't like the fact that there is air remaining in the cooling system after the engine cools down.
The recovery system used to work perfectly until I took the car to the dealer to have a freeze plug replaced, then another freeze plug replacedand then the rear heater core replaced. Since then the coolant recovery system is not working properly. They did flush the system and put on a new radiator cap (I wish I had requested the old parts then I would have the original radiator cap). The radiator was just replaced. (Luckily under the after market warranty.) It seems that this vehicle has a cooling systemcorrosion problem. I am expecting a cylinderhead corrosion problem next. They are aluminum aren't they?
This raises another question. The dealer says the pressure rating of the radiator cap should be 21 psi. The Haynes manual says 18 psi. The local parts store (Kragan) says it should be 20 psi. I can't locate the pressure rating in the FSM. What is the correct pressure rating for the cap? Does anyone know? It's a 2001 Dorango V8 4.7 Liter engine.