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heater box hose

Started by _uglybob_ , Nov 09 2006 08:44 PM

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20 replies to this topic

#1 _uglybob_

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Posted 09 November 2006 - 08:44 PM

hey guys where about exactly do the two hoses for the heater core run?? do they both go to the thermostat housing or does one go to the water pump if so does the other one go to the top or bottom of the thermostat housing??
cheers guys
ben

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#2 _CHOPPER_

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Posted 09 November 2006 - 08:53 PM

I personally would run one from the thermostat housing to the top of the heater core and the other one to the water pump. There really is no right or wrong way, as long as you get coolant flowing across the heater core it will work.

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#3 _uglybob_

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Posted 09 November 2006 - 09:40 PM

thanks again chop. will it still work well enough to just run both to the thermostat housing??

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#4 _evilsim_

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Posted 09 November 2006 - 09:55 PM

This probably wont help unless you have a 308.

Posted Image

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#5 _CHOPPER_

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Posted 10 November 2006 - 04:30 PM

thanks again chop. will it still work well enough to just run both to the thermostat housing??

That's how my HJ was originally plumbed. It worked fine that way, I just thought I would get a better coolant flow hooking it up the way I described.

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#6 _uglybob_

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Posted 11 November 2006 - 12:25 PM

yeh that would make sense. looks much tidier though if both go to the thermostat.
cheers chop
cheers for the pic evilsim would mind mine looking like that..

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#7 _73LJWhiteSL_

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Posted 11 November 2006 - 08:40 PM

From what i have seen:

LCs come out from the thermostate and waterpump on the drivers side and cross over the top of the rocker cover.

LJs come out of the passenger side of the theremostate.

Steve

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#8 ls2lxhatch

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Posted 11 November 2006 - 09:09 PM

I can not see how it would work if both hoses are connected to the thermostat housing. Water needs to be pumped through the heater core. It makes more sense for one hose to connect to the water pump and one hose to the thermostat as in the picture above.

Edited by AndyCullen, 11 November 2006 - 09:11 PM.

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#9 _devilsadvocate_

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Posted 11 November 2006 - 09:42 PM

AFAIK, the holden red six fairly early on has outlets/inlets for two sets of heater hoses......heater and manifold, which Im not sure about which model got these 1st. Later models that didnt get the heated manifolds just got bypass hoses here.
The thermostat housing has two outlets one inlet(apart from the radiator hose) Two +ve outlets horizontally opposed at the top and a return/inlet at the bottom. The other inlet of course is at the water pump. Either set can be used.
In answer to the question, which hose to connect?, either way around will work, but for what its worth(youd need very cold air and an incredible blower to cause restriction of flow due to convection), work with gravity not against it and connect the outlet house of the motor to the higher connection on the heater

Edited by devilsadvocate, 11 November 2006 - 09:44 PM.

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#10 TerrA LX

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Posted 11 November 2006 - 09:50 PM

yeah one to the pump and one to the thermostate.
dont forget as pictured above the thermostate bypass.

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#11 _CHOPPER_

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Posted 11 November 2006 - 10:56 PM

I can not see how it would work if both hoses are connected to the thermostat housing.

The laws of physics dictate that it will work. And as I previously posted it worked in my HJ, so I can state it works in practice as well as theory. If you want a scientific explanation, I can provide it. Without doubt, devils could as well.

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#12 ls2lxhatch

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Posted 11 November 2006 - 11:55 PM

I can not see how it would work if both hoses are connected to the thermostat housing.
The laws of physics dictate that it will work. And as I previously posted it worked in my HJ, so I can state it works in practice as well as theory. If you want a scientific explanation, I can provide it. Without doubt, devils could as well.

I would be happy for someone to explain to me how water will flow through the heater core when both hoses are connected to the thermostat housing.

Just to make sure that we are all talking about the same thing lets take the photo above and assume that we block to two pipes on the water pump and connect the heater hoses to the two pipes on the thermostat housing.

The first problem I see with this is that you have now blocked the thermostat bypass circuit which is not a good idea as it is important to keep water circulating even before the engine has reached operating temperature to avoid uneven heating of the engine. The second problem is that both hoses share the same hole so the pressure would be the same and there is no reason for the water to go though the heater core.

I can see that the water will eventually get heated by heat transfer but I can not see why it would flow or that the heater would work effectively.

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#13 _devilsadvocate_

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Posted 12 November 2006 - 12:07 AM

Andy, I see the prob, you are looking at the thermostat cover of the V8, where there are 2 +ve outlets and the two -ve inlets are on the water pump. Yes, there is no way that connecting the two top hoses of the thermostat housing to the heater will do any good.
The red six, as I thought perhaps we were talking about in the TA-LJ sections, is not the same:

The thermostat housing has two outlets one inlet(apart from the radiator hose) Two +ve outlets horizontally opposed at the top and a return/inlet at the bottom. The other inlet of course is at the water pump.

Perhaps that isnt clear, there are three connections to the thermostat housing, 2 +ve, one -ve(this is separate to the +ve ones and returns the flow to near the water pump.
Does that clear it up?

Edited by devilsadvocate, 12 November 2006 - 12:08 AM.

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#14 rodomo

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Posted 12 November 2006 - 12:30 AM

Easy answer:
Hot source from thermostat outlet,
Through heater core,
Return to waterpump inlet side.

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#15 _devilsadvocate_

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Posted 12 November 2006 - 12:51 AM

Just to avoid any confusion, one can see the outlets on the 6cyl thermostat housing, the two +ve ones(one going right the other left).....the bottom one(-ve) return is obscured by the alternator bracket in the pic.
Posted Image

Edited by devilsadvocate, 12 November 2006 - 12:57 AM.

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#16 ls2lxhatch

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Posted 12 November 2006 - 01:47 AM

devilsadvocate you are correct. It is clear now that the problem is that I was refering to the V8 picture, Chopper was talking about a six cylinder HJ and I thought Chopper was talking about a V8 HJ.

I did not see your post @ 9:42 which clearly stated you were talking about six cylinder upper and lower thermostat housings.

I should have known that we were talking about a 6 cylinder as the first post asked about the top and bottom thermostat housing connections.

Edited by AndyCullen, 12 November 2006 - 01:52 AM.

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#17 _CHOPPER_

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Posted 12 November 2006 - 03:32 AM

The original post to me sounded like the question was about a Holden 6, so I stated my experience. All of my answers were relating to Holden 6 cyl motors.

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#18 TerrA LX

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Posted 12 November 2006 - 12:07 PM

i was refering to holden V8.

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#19 Pop's-SS

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Posted 12 November 2006 - 10:21 PM

Hope this helps.

This is a photo out of one of my 70s magazines

Posted Image

Be extremely careful when taking off or putting on of the hoses of the heater core.

If putting on make sure you support the pipe coming out of the heater core.

When taking off MAKE sure you undo the clamp fully then slit the hose that is covering the heater pipe with a sharp knife .

If you fail to do any of these then you WILL run the risk of breaking the pipe away from the heater core as that is a very weak point.

Unfortunately with the LJ I had, I had "been there, done that"

Regards .................. Barry