This is one of those debates like towing with/without the driveshaft
removed, LMA vs silicone brake fluid, and cats. What was the dispute about
cats?
But anyway... water is polar and likes to have ions in it so distilled
water, which is pure, polarized water, tends to leech minerals out of
whatever it touches including the iron in your engine block. So yes, tap
water has lots of junk in it, but it won't dissolve your engine. My Toyota
Tercel, which has an aluminum head, requires de-ionized water and the only
source I could find for this is pre-mixed coolant. Whatever was in the car
when I got it did dissolve the head almost through to the combustion
chamber. I've always used tap water and coolant in my B and never had a
clogging or dissolving problem. And I flush the cooling system and the
brake system whenever I remember which is about once every ten years.
While I'm on the subject, it's possible to flush the cooling system with the
cheap Prestone adapter without removing the thermostat. You hook up the
garden hose and set it to trickle and then run the engine to operating temp.
You'll know when the thermostat opens because the flow suddenly gets bigger
and dirtier.
Denise Thorpe
Danny V. said:
After flushing, ALWAYS use distilled water with or without antifreeze.
Mineral deposits are usually caused by the use of tap water in cooling
systems.
Danny V.
'58 MGA
'79 MGB V-6
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