So I wonder how a shop flushes the system before putting in new coolant.
Do they also reckon that they'll only get half of the old coolant out
and just dump new in atop the old stuff?

The cooling system is a marvel of spaghetti engineering. I'd like to see
a 3D model of the thing. As many times as I've looked at the hoses, I
still don't have a good sense of all the roller-coaster highs and lows
in the thing.

Even with a tee in the heater hose, which has to be the lowest spot in
the system, so much coolant stays behind. It must be pooled in low spots
that have higher entries and exits.

--
Jack "Rocket j Squirrel" Elliott
Bend, Ore.
1984 Westfalia. A poor but proud people.
1971 "Ladybug"-brand utility trailer ca. 1972 from a defunct company in
San Clemente, Calif., now repurposed as The Westrailia.

On 05/10/2012 08:55 PM, Alistair Bell wrote:
> I understand and sympathize. I had difficulty getting it all out, even using a shop vac (with intermediate 20 l bucket). But I do think I got more out with the shop vac than when I did it without.
>
> alistair
>
> On 2012-05-10, at 8:15 PM, Rocket J Squirrel wrote:
>
>>
>> Clearly, I never drained anywhere near most of the old coolant.
>>
>> I am puzzled. Oh -- the heater valve was open.
>