M20/B25 Radiator drain, flush, and refill

["K.C. Boyce" <k_boyce@xxxxxxxxx>]

You'll first need to open the cap on the remote reservoir.  Remove the
little blue plastic screw (at least that's what it is on mine) from
the driver's side bottom of the radiator.  Let the coolant spill all
over the place (because there's no way to catch it all!  Actually, try
to catch what you can, and kitty litter the rest -- antifreeze is
poisonous stuff!).

You then need to drain the block.  The drain plug is located
underneath the exhaust manifold near the rear of the passenger side of
the engine.  It's a little easier to catch fluid here, but a pain in
the butt to reach the plug!

Flush...

When you refill, be sure the plugs are back in!  Then loosen the
bleeder screw, located on the top of the thermostat housing.  SLOWLY
fill until coolant begins to spill out of the bleeder screw.  Get the
engine up to operating temp. (and I think it says something about fast
idle, too...) and let coolant spill out of the bleeder screw until it
is free of bubbles.  Tighten that sucker back down, and make sure you
have enough coolant left in the reservoir tank.

Oh yeah, make sure that the heater control is on full heat!

Good luck.

    KC Boyce
    '85 325e
    E30 Eta Page: http://rikki.cc.colorado.edu/~k_boyce/





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