| [GMCnet] Checking my understanding of heater hose routing [message #317627] |
Tue, 16 May 2017 16:35  |
Richard Denney
Messages: 920
Registered: April 2010
Karma:
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Senior Member |
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When installing the new engine, we noticed that the heater hose routing on
my coach was not original, and incorrect. My routing WAS: from rear of
manifold back to the house water heater, then from water heater to
dash-heat heater core (through a vacuum-switched heater control valve),
then from heater core to fitting on top of water pump. With this
arrangement, if the dash heat is turned off and the heater control valve
closed, the house water heater won't heat. That was the symptom: A COLD
shower during the drive down to Georgia. I usually don't depend on the
engine coolant to make hot water, meaning I usually don't take a shower as
soon as I stop driving. I do recall having hot water on one prior
occasion--perhaps I was running the dash heat (that may have been before I
replaced the heater control valve, which has been several years).
I looked at a coach in Bean Station, which was plumbed like this: Back of
manifold to tee, which branched to house water heater and heater core, and
top of water pump to tee, which branched to house water heater and heater
core. That seems correct to me.
I'm doggoned if I can find a heater hose routing diagram in the manual or
parts book.
At what point is the hose supposed to change from 5/8" (which comes from
the back of the manifold) to 3/4"? My guess is at the heater core, but I'm
also assuming that it will be 3/4" on the outflow barb on the house water
heater.
Thus, I'm assuming 5/8" hose from the rear of the manifold to a 5/8" tee,
which splits to feed 5/8" hose to the house water heater, and 5/8" hose to
the heater core, through the heater control valve.
And then 3/4" hose from the water pump to a 3/4" tee, which splits to feed
3/4" hose to the house water heater and 3/4" hose to the heater core.
Do I have that right?
Rick "no more cold showers" Denney
--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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