Darrell Boehler wrote:

> Hi Scott,
>     You can replace the stock T with a 5/8 on all 3 points and then run a
> 5/8 heater hose to your rear heater. The present rear heater hose is 1/2 on
> the T end and 5/8 at the heater core end. There are usually good reasons why
> engineers design things as they do but the rear heater Ts are beyond my
> reasoning ability.

Darrell, I suspect that reasoning behind the 1/2 rear heater line was to balance
the coolant flow between the front and rear heater circuits. The front circuit
is much longer than the rear and would restrict flow more. By choosing a 1/2
line for the rear T'd from a 5/8 feed to the front, the flow rate would be more
equal (hopefully).

Larry Johnson