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Old 06-13-2013, 07:46 PM
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Vortec Heater Routing

I want to connect the heater in my 5.7 chevy

I have the vortec motor, so I assume I need the bypass. The first photo has various connections marked A thru E.

Which is the best way to run the hoses? I need the bypass, does the bypass run enough water to power the heater? I have indicated this way in photo Option A.

B.
Block of the current bypss hose at the manifold. Run the heater hose from the water pump and back to the radiator.

C.

Block off currect bypass hose from Manifold. Instal new bypass as per manifold fitting instructions, by running short hose from C or D in first picture, to the waterpump E. Then run heater from manifold where temp sensor is at the moment, thru heater core, and back to radiator.

D.
Bypass remains, and runs from the side of the manifold to the heater, and then return to the radiator.

Thanks guys really appreciated!

Any suggestions welcome,



http://s23.postimg.org/ayazr231n/option_B.jpg


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Old 06-13-2013, 07:52 PM
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Sorry I don't know how to use the site, but learning after this effort. I typed up all the questions, ened up with 3000 characters, had to drop 2000 words.

I think it is posted now, but anyway, the pleasantries and greeting etc were deleted, so here goes..

Hi everyone, awesome site. Really great to talk to others passionate about older cars!

I am having trying to hook up my heater but wanted some expert opinion. And any replies are very gratefully received!
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Old 06-14-2013, 10:32 AM
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Quote:
Originally Posted by holden350 View Post
I want to connect the heater in my 5.7 chevy

I have the vortec motor, so I assume I need the bypass. The first photo has various connections marked A thru E.

Which is the best way to run the hoses? I need the bypass, does the bypass run enough water to power the heater? I have indicated this way in photo Option A.

B.
Block of the current bypss hose at the manifold. Run the heater hose from the water pump and back to the radiator.

C.

Block off currect bypass hose from Manifold. Instal new bypass as per manifold fitting instructions, by running short hose from C or D in first picture, to the waterpump E. Then run heater from manifold where temp sensor is at the moment, thru heater core, and back to radiator.

D.
Bypass remains, and runs from the side of the manifold to the heater, and then return to the radiator.

Thanks guys really appreciated!

Any suggestions welcome,



http://s23.postimg.org/ayazr231n/option_B.jpg

All that happens if this is a simple heater without air-conditioning is that essentially the heater core is plumbed into the bypass. The hoses of the heater core are usually 5/8ths in and 3/4 return. But this can vary, given you're using the circuit as a bypass with a hose of some size, then both the manifold and pump fittings probably accept the same size hose what ever it is you used. You may have to change one of the fittings to match the hose sizes into and out of the heater core and buy matching hose sizes of sufficient length to rach from the engine connections to/or through the firewall to the heater core.

All that happens is the intake coolant return is the pressure source of coolant, this is always selected becasue the tap is before the thermostat so that coolant will flow through the bypass and heater core even when the
thermostat is closed. The return is to the pump fitting, it connects to a passage internal to the pump that leads back to the intake side of the impeller.

If the car has factory air-conditioning there would be a 3 way valve in the circuit to the heater core that is either vacuum or cable controlled from switches on the dash panel. All this valve does is to provide a shunt that bypasses the heater core returning the coolant to the water pump when the air-conditioning is operating so the system doesn't also have to cool a hot heater core.

Bogie
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Old 06-14-2013, 02:57 PM
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Heater hose reroute improved cooling and thermostat function

If you have the extra water ports on the back of your intake manifold you can try this for a bit better cooling.
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Old 06-14-2013, 04:46 PM
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Heater hose reroute improved cooling and thermostat function

If you have the extra water ports on the back of your intake manifold you can try this for a bit better cooling.
Actually I quite like this, going a bit further with this thought is that bubbles of vapor tend to trap above the rear combustion chamber, a good way to prevent this is to tap off both rear sides of the intake. Run each tap to Tee then route into the heater core. This pretty much scratches Smokey's old itch about bubbles getting trapped in the upper rear part of the heads.

Bogie
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Old 06-16-2013, 06:52 PM
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Hi guys, thanks very much for your responses, I think I have a plan now due to your input but thought I should run it past the experts first!

Fbird (and Bogie) I would like to try to run from rear ports to ensure no hotspots, but I have the Edlebrook 7116 intake manifold

http://www.edelbrock.com/automotive_...7000/71116.pdf

and as far as I can tell there are no rear water passages so that unforetunately wont work for me, but I apprecaite the option.

So I am left with running the bypass thru the heater core, I have no air conditioning, so don't have any valves etc to worry about.

Purely for ascetic reasons, I am wondering if it will work as follows?



In this photo I propose blocking the manifold port 'A'. As per the Edlebrook instructions, I am thinking of running from the Bypass port under the thermostat (I think "C' in my photo).

Then running back from the core to the waterpump.

The heater core hose outlets are both 5/8.

So I think it will work but thought I better check, Just a little concerned because the bypass outlet is 3/8-18 PIPE according to the instructions. Will this be big enough to flow to the heater core? I can use the larger 1/2 in outlets on the intake but this will look rather nastyand droop hose lines all over the top of the motor, if I can use the front bypass it would look alot better.

So recap, can I run from the 3/8 bypass hole on the front of the manifold, thru a 5/8 heater hose into the 5/8 pipe on the heater core, thru the heater core, out of the 5/8 outlet, thru a 5/8 hose, and then into the 3/4 fitting on the water pump without any issues?

Many thanks guys, I needed your initial explainations so I coud work out water direction etc, then armed with the started thinking ascetics, hope thats ok!

Cheers

Rob
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Old 06-17-2013, 12:21 PM
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no after market ac/heat system has bypass built in, vintage air, hot rod air, etc...
heaters were an option back in the day, the factory just installed plugs instead of hose fittings
as for the initial purging of air just turn the heat on for a minute or 2
on most motors the heat out is near the thermostat and the return is on the water pump
once the motor is up to temp and the thermostat is open you have the required bypass
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