Re: Draining & bleeding?

[zm@mhcnet.att.com (Zafer Mehmood [209])]

> 
> Since I need to reform the cooling system of my 87 5kcst this week end. I 
> have some quesstion really want to make sure before this project peformed.
> 
> 1) When I drain the cooling system , any hose or any things need to be 
> removed, except the radiator bottom hose? And how to drain out the 
> coolant that stay in the heater system?
> 

In addition to the bottom radiator hose, you need to disconnect the
heater hose that connects to the back of the engine block, right by
the firewall. This will allow the coolant in the engine to drain.

> 2) When filling the coolant, do I have to removed any screw for 
> bleeding the air from the cooling system?
> 
No. The Bentley manual makes no reference to bleeding the air out of
the coolant system. In my experience, this hasn't been necessary.
After you fill the system with coolant/water mixture, let the engine run
until the thermostat opens and the coolant circulates. This will remove
any trapped air. Then add more cooalnt as needed and only then put the
coolant reservoir cap back on.

Couple of suggestions: Use phosphate-free coolant only (Autobahn or Prestone
Long Life, in a silver container). I generally use distilled water instead
of tap water; this eliminates salt deposits in the system due to hard water.

Zafer
'87 5KCSTQ IA Stage II