1978vett

I am wanting to bypass the heater core in my 78. would it be ok to connect the 2 hoses that go to the water shut off valve ? and what size connector would I need ?? Thanks for your help..

Dodosmike

IMO if you connect them hot water will still circulate through the core.

Put a brass or stainless steel 1/4 turn ball valve inline.

Your hoses may have been changed at some point. Mine is 5/8"id if i recall.

If its an A/C car, for some reason I think the hoses are different sizes. Somebody with vastly more knowledge will chime in I'm sure.

Serach "heater shut off" here. LOTS of threads already.


dodosmike

1978vett

Thanks for the reply.. I might be looking at it wrong,, but I was thinking if I connected the 2 hoses that run to the shut off valve from the radiator side it would bypass the heater core..

Camivette

I pulled them and plugged them at the intake. 2 different sizes 5/8 and 3/4 if I remember correctly. I believe a shut off valve in each line is best

MalibuVLX

While I was breaking in my engine and doing general mach up, I just ran a loop from the water pump to the intake. The two inlets are different sizes, but I had zero leaks just using regular hose clamps on the smaller port.

5/8 and 3/4 is correct. Just bought new ones last week.

jr73

Plug the 2 holes in the motor and take the heater hoses right off. Stick them in a box somewhere in case you want to hook them back up. It will look cleaner.

oldschoolvette

that works

or loop from pump to intake

or just pipe plug pump and intake

any of these work

AdamMeh

Here is a shot that shows the "loop" idea, which is how we got the car and after when I plugged them - cleaner looking with no hose IMO.



Adam

tektrans

Wow all you did was plug them and look how "clean" everything got.


Nice engine bay!

AdamMeh

I sure wish it would have been that easy! And thanks for the compliment.

Adam

donyue

My heater core was leaking so I disconnected the hoses from the engine and core and put plugs in the intake and water pump.

It looks much better and don't have the extra hoses in the engine compartment that are not doing anything.

Plus it ensures there is no unwanted heat coming in from the heater core

BKbroiler

Like others have said, use plugs at the intake and water pump. Eliminate the hoses completely and certainly don't add a goofy looking bypass hose.

pnewt

I see how the bypass works on your later C3's. Where do you find the plugs for the intake and water pump and in my 68,there is a small tank on the fender where hoses go. The tank hoses have been 'looped' as the hoses are off the heater core ends. Little help Please Thanks

Snoopysvet

Mine are capped as well, is there any downside to this, circulation issues?

AdamMeh

The fittings in the water water pump and intake are standard pipe thread. Depending on what type of plug you want, you can pick them up at a hardware store, or if you want something nicer, try a local parts place or Summit.

In my aluminum intake, I used the brass version. The plugs in the water pump are steel. All of them came from a local hardware store. You can see most of them in this photo...



Adam

pnewt

5/8 and 3/4??

imariver

If you run a loop like that, your going to be pumping hot water right back into the engine, without it going through the raditor.
Might work ok if you live in Alaska, but otherwise............Don't do it.

AdamMeh

Not sure of the sizes at this point - if you have a stock intake it might be different as well. Sorry - not much help on that.

BKbroiler

There is no downside. I've had this setup for years with no problems.

I'm pretty sure those are the pipe plug sizes I used.

Torqued Off

Aahhhh...sorry, that is not correct. The heater core is not a radiator.