Originally Posted by johnbell47
Can the teacher and the engineer tell the rest of us how to go about a coolant change out in our F-53's??? That is what started the thread and we need to know how to do it right. From an old mechanic.
Depending on the year, and the visual condition of the degas bottle , here is the best way to do a coolant exchange ( without flush)
1. Best to be done at room temperature
2. You will need some sort of catch pan IF you have to remove the lower radiator hose.
3 plastic drain valve on the lower radiator tank can be opened by hand or with a pair if pliers ( rightey tightly leftey loosey)
4 open drain valve, once coolant starts to slow down, now open the degas bottle cap.
5 If degas bottle has any kind of buildup inside, this indicates the coolant has exceeded its lifespan and you will need to flush the cooling system.
6. ONLY USE MOTORCRAFT VC-1 coolant flush, follow the directions on the bottle.
7 once drained ( and flushed if needed) just close up the drain valve or reattach the lower radiator hose.
8. Refill with correct coolant based on your application. Just fill the degas bottle 1/2 way
9 leave the cap off the degas bottle.
10 run engine at idle, keeping an eye on the degas bottle, keep it at least 1/4 full.
11. Once the upper radiator hose is hot ( not warm) check degas bottle, should be between cold and hot.
12.replace degas cap
13. Let engine idle for 10 min
14. **** off engine, check degas bottle for correct level.
15. Check degas bottle again after engine cools down ( about 6 hours).
I may have missed some steps, just trying to make it easy to understand.
One thing I did miss is that if your rv has a heater control valve ( most class A's do) make sure heater control is set to floor and max temp ( no blower needed) , note ford class C's do not have a heater control valve they have a "blend door" no action needed.