[DeTomaso] Heater Hose Connection Question

[Tomas Gunnarsson]

> Tomas
> 
> That is certainly counter-intuitive.  It that the stock methodology or a 
> solution that you determined superior?

> I don't know what was stock. The story is like this. I had thought that it was necessary to install heater shut off valves to get rid of unwanted coolant circulation through the heater core. I removed and completely disassembled the heater valve thinking it needed to be repaired/rebuilt. It became obvious to me that it was self-sealing in one direction and self-opening in the other direction. The design is very much like an intake valve in a cylinder head if you get what I mean. I found that my coolant flow was in the self opening direction and I re-routed it to be self sealing. The result was very good.

> Is there slack in the heater cable that allows the valve to open or would
> we 
> see the lever control move if we paid close enough attention?

> The heater cable mechanism is not precise enough to ensure complete transfer of the lever movement to the valve to ensure complete shut off. That's my conclusion. I mean, just feel what it's like when you move the lever over to the "shut" position. There's no  "click", just a vague "I reached the end of lever travel". When you let go of the lever everything will settle at "almost closed" and then pump pressure will overcome it to some degree.

> I suppose that this also suggests that fluid in the line blocked by the 
> heater valve will act as a solid and not circulate. Heat transfer for the 
> coolant in the engine to the heater core (when the valve is closed) is only
> through convection and not circulation.??

>This is my conclusion too. If you have heater shut off valves there's very little difference between shutting one valve off and shutting both valves off. It's hard to imagine a cylindrical fluid body of say 200 cms of width and 1 cm of diameter to produce a noticeable amount of circulation to transfer much heat. Anyone that has dual heater shut of valves can try this by opening one of the valves and touching the heater hoses underneath the dash after a drive.
 
Tomas

> ----- Original Message ----- 
> From: "Tomas Gunnarsson" <guson at home.se>
> To: "Mike Thomas" <mbefthomas at comcast.net>; <detomaso at realbig.com>; "John 
> Taphorn" <jtaphorn at kingwoodcable.com>
> Sent: Thursday, July 05, 2007 5:50 AM
> Subject: Re: Re: [DeTomaso] Heater Hose Connection Question
> 
> 
> John,
> 
> That is the wrong way to do it. The difference in pressure will then force 
> the heater valve open. The correct direction of flow is from the block,
> into 
> the core, out of the heater valve, to the water pump. This will force the 
> valve shut in the off position. After finding this out and connecting the 
> hoses accordingly I haven't had to use my shut off valves to prevent 
> unwanted heating. I can assure you that with a working heater valve there
> is 
> no noticeable heat transfer along the heater hoses.
> 
> Tomas
> 
> 
> 
> > Från: "John Taphorn" <jtaphorn at kingwoodcable.com>
> > Till: "Mike Thomas" <mbefthomas at comcast.net>, <detomaso at realbig.com>
> > Rubrik: Re: [DeTomaso] Heater Hose Connection Question
> > Datum:  Wed, 4 Jul 2007 22:18:42 -0500
> 
> > Mike
> >
> > I would suggest that the water exiting the block (pressure side) head
> > toward
> > the flow control unit and the line exiting the heater core connect  with
> > the
> > water pump (suction side) . Thus theoretically, the hotter coolant
> exiting
> > the block is stopped prior to entering the heater core and compromising 
> > the
> >
> > AC when you need it.
> >
> > JT
> >
> > ----- Original Message ----- 
> > From: "Mike Thomas" <mbefthomas at comcast.net>
> > To: <detomaso at realbig.com>
> > Sent: Wednesday, July 04, 2007 7:29 PM
> > Subject: [DeTomaso] Heater Hose Connection Question
> >
> >
> > > Does it matter which heater hose gets connected to the block and which 
> > > to
> > > the water pump?
> > > Thanks
> > > Mike Thomas
> > >
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