Date: Mon, 24 Aug 2009 23:12:08 -0400
Reply-To: mcneely4@COX.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dave Mcneely <mcneely4@COX.NET>
Subject: Re: R rear heater blowout - stranded
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=no
So, some say joining the hoses prevents the engine from warming up
adequately. Others say joining the hoses prevents the engine from
cooling adequately. The lack of agreement seems to indicate that
someone doesn't know what is happening. But, fact is, with the rear
heater off, there is no effect of the heater on cooling. the VW
engineers expected this to happen. With the rear heater on, there is
some effect on cooling. The VW engineers expected this to happen.
Joining the hoses is an in between situation -- there is circulation,
like with the heater on (some cooling), but there is no radiator (less
cooling than with the heater on, but more than with it off (perhaps). I
can't see that it makes a hill o'beans whether one plugs or joins the
hoses. joining is less prone to failure, though, as it does not cause
pressure to build up.
Until I can find some actual cause and effect phenomenon regarding
joining the hoses, I'll leave them that way. Now, Scott's idea that
going to the root of the hoses, and blocking the flow there does sound
reasonable, but more trouble. But it seems that the heater is just a
loop on the flow to the radiator. I can't see how, as some have
suggested, thta joining the hoses keeps coolant from going to the
radiator.
Dave Mc
On Mon, Aug 24, 2009 at 9:45 PM , Don wrote:
> By joining them you create a shorter return route for the hot coolant
> that does not include the radiator (where the liquid is "cooled"). By
> blocking the two hoses all coolant now goes to the radiator before
> returning to the engine. With the heater core in the circuit it acts
> as a mini radiator removing heat from the coolant (and blowing it into
> the cabin) before it returns to the engine.
>
> For the most effective cooling of the "coolant" it needs to run
> through the radiator or an intact heater core with the fan on.
> Cheers
> Don
>
>
> On 24-Aug-09, at 6:35 PM, miguel pacheco wrote:
>
>> Correct me if I'm wrong, but what you describe as a 'short circuit'
>> pretty much simulates coolant flowing through the heater core.
>> I have read here, on this forum, that, once the core is removed, the
>> in and out hoses can either be blocked off, or joined.
>> Miguel
>>
>> On Mon, Aug 24, 2009 at 3:47 PM, Don Spence wrote:
>>> Not a great idea as this just creates a "short circuit" for the hot
>>> coolant to bypass the trip up to the radiator and allows HOT coolant
>>> to return to the engine. Better to plug or clamp off both heater
>>> hoses thus sending all the hot coolant to the radiator. (Thanks to
>>> Dennis for pointing this out to me a couple of years ago.)
>>>
>>> On 24-Aug-09, at 3:22 PM, Automatic digest processor wrote:
>>>
>>>> Date: Mon, 24 Aug 2009 16:47:01 -0400
>>>> From: Jeff Lincoln Subject: Re: rear heater blowout - stranded
>>>>
>>>> Matt,
>>>>
>>>> I'm not saying your blocking the hoses will hurt anything - because
>>>> I really
>>>> don't know - it might.
>>>>
>>>> What I did when this happened on an '85 I used to own was to get a
>>>> length of
>>>> high temp hose and fasten it between the send and return hoses you
>>>> speak of.
>>>> Creating a loop so the coolant could still flow. That "repair" is
>>>> still in
>>>> place because a friend of mine now owns that van.
>>>>
>>>> At least that way you could keep traveling with no worries and get
>>>> a new
>>>> heater core at your convenience.
>>>>
>>>> Good Luck.
>>>
>>
>>
>>
>> --
>> Miguel
|