tranbert

hi.
im trying to flush the coolant in my '91 100
but there doesnt seem to be a drain plug. i consulted a repair manual for the 5000 and it said i was to remove the hoses and drain from there. any advice?

SteveAngry

simple and easy to do...

To drain...

set climate control heater setting to HI...

open reservior cap...

disconnet the heater return hose near the engine block(small 3-4 inch hose near the thermostat housing)

remove thermostat housing side of lower radiator hose only...

let coolant drain down the oil pan side ito a strategicly placed pan...

Then flush system by adding some lukewarm distilled water in the coolant reservoir to "flush" out the last of the old coolant. This is what I did. I choose not to use any over the counter radiator flush additive as I did not want to dislodge anything that would plug up my 14 year old radiator. If you want to use a coolant flush additive then follow the directions on the package...

to refill coolant:

Tighten both hoses securely with new clamps.

Climate control set to Hi again...

fill reservior with coolant until it is full...

with cap off reservior, start engine and watch reservior tank's fluid level. Add fluid if necessary...

when level remains constant, close tank with cap...

let engine continue to run until radiator fan operates...

check coolant level again and top up if necessary...

Done. Make sure you use a good coolant...

Steve
Michigan