| [GMCnet] '78 heater line connections [message #303018] |
Sun, 03 July 2016 20:23  |
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mark grady
Messages: 70
Registered: November 2015
Location: northern Indiana
Karma:
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I'm working on final fitting this week of the interior. PO had added front
and rear extra heater cores, one under the passenger side bunk bed and one
tee'd off the water heater loop under the rear bed. Both were leaking. Both
are now removed until the next phase of the project.
I don't think the heater lines connecting the engine and the dash heater
core are correct.
The front heater core uses a 5/8 supply hose, and a 3/4" return. I don't
know if this is correct, but the heater core connectors are two different
sizes.
Here is my assumption. When correct - the heater supply line is from the
passenger rear intake manifold threaded fitting, which on many Olds engines
had a vacuum operated heater control valve. The GMC does not.
The return line is connected to the fitting on the water pump that faces
the AC compressor on the passenger side of the engine.
My question: Is the rear water heater pre-heat tee'd into both the heater
core lines, or is it in series with the return side of the heater core?
An answer or a reference to the page in one of the manuals is appreciated.
Mark Grady
'78 Kingsley
N.IN
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