Is this a TR6 or a 4cyl? 4's have a drain tap on the block that should be
opened too.
If your coolant is brown it's way past due for replacement.
Best way is a back flush as in the clean water moves through in the opposite
direction to normal.
Remove the thermostat and both main rad hoses (top and bottom) Open the
heater valve.
This will allow a gravity drain of the cooling system. Try to collect this
stuff for proper disposal (not down the sewer) unless you really hate your
neighbor's cat, then leave it around in pools so the cat can poison itself.
(just kidding, dispose of properly as this is both attractive and poisonous
to wandering mammals and not good for the earth either)
Using duct tape, stick the hose in the lower rad opening and tape to seal.
Turn on the hose and run until the water coming out the top is clean.
Now move the hose to the top engine hole (thermostat housing) Tape it in,
close the heater valve ( no point in pushing crud into the heater core) and
flush the block.
lastly, pull the heater hoses off the block and reverse flush the heater
core.
Reconnect everything and add straight antifreeze to a volume that represents
at least 10 to 15% stronger than your target concentration. (there is still
water sitting in there) Top up with clean water and run car to operating
temp. Check antifreeze and adjust as necessary. (make stronger if required
but don't bother if it's higher concentration-lower temp- than your target.
If all this is too much trouble, prestone sells a flushing kit that puts a
hose adapting T connector in your heater hose. You hook up the hose, remove
the rad cap and flush away to your heart's content.... after properly
collecting the old coolant!!
Cheers
Don
At latitude 53 where the day's are definitely getting shorter and the leaves
are falling.
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