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I'm looking at routing of the water hoses to the heater. How was it run originally? Anyone have pictures of how it is supposed to be? Mine have been changed to steel braided. From the intake it goes out to the heater. From the heater it comes back close to the A/C compressor. Then there is a metal pipe going through the compressor bracket. Then a short hose to the water pump return.
On mine the metal bracket is not attached to anything. I'm sure this isn't right. I found that there is a part called an "S" tube. https://www.corvettecentral.com/c3-6...80%26count%3d9
I looked at the diagram for this pipe, but it doesn't show how it connects.
Also at the heater connection I see hoses that have a 90 degree bend. Mine don't and there is a kink in the line. I don't think this is good. If I want to stay with steel hoses, is there a 90 degree fitting that would help this?
Also in mine line from the intake to the heater, there seems to be some kind of shut off valve. I assume this was put on by the original owner, but I'm not sure. Did Chevy put anything like that?
I am planning to pull these hoses out by the weekend.
My s pipe was either not there from beginning or thrown out. Many just buy heater hose and run it all the way..
my suggestion is to buy from one of the vendors they come prebent on ends that go under to heater core and you really dont want to be pulling on them...
you should also have a hor water **** off so heat is stopped going into car..some buy shut off valves..i like the vacuum original...especially if you have ac..
On the Gates hoses, you will trim the length of each hose at heater core. These hoses are made in the USA and tuck up in there very nice once cut to length..
The inline valve is manually shutting off water flow, cant tell what hose they used.
The factory Vacuum operated inline valve was placed in the 5/8" line.
Personally, I would delete the metal "S" pipe and feed the 3/4" hose under the compressor. At least on my 77 between the compressor and bracket there is a flat part of the bracket the hose will fit through.. Less hose clamps and splices.
Last edited by bmotojoe; May 28, 2020 at 08:14 AM.
I didn't realize the heater vacuum shutoff was supposed to be in the engine compartment. There is an issue with something in there, maybe that shutoff, that causes heat to come out the floor vents even if the heat isn't on. Might also be interfering with the A/C as they might be working against each other. That is a problem for when I do the interior work, so it looks like this issue will be shelved until I start working on that. I don't want to start down that rabbit hole just yet. I need to get other stuff worked out now.
FROM WATER PUMP UNDER A/C COMPRESSOR 'S' SHAPED METAL PIPE. PIPE COMES UP BEHIND A/C COMPRESSOR AND HOSE THEN GOES TO HEATER CORE FROM INTAKE MANIFOLD TO HEATER VALVE AND FROM HEATER VALVE TO HEATER CORE. ALSO THERE ARE SPECIALTY MOLDED HEATER HOSES THAT CONNECT TO HEATER CORE
THIS IS FROM A 1981
Heater Pipe Routing Question 1980
