Date:         Thu, 29 Jul 2010 22:07:38 -0600
Reply-To:     Don <dkspence@TELUS.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Don <dkspence@TELUS.NET>
Subject:      Re: Turning off rear heater
In-Reply-To:  <19740413173432.84A4A3E374DA7957@edtnaa21.telus.net>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

On 29-Jul-10, at 6:40 PM, Automatic digest processor wrote:

>  Go to the hardware and get a double-ended hose barb...I used a
> regular
> metal one from Home Depot...A couple of hose clamps, too.  Make a
> loop and
> take the heat radiator and fan motor right out.


Don

>> 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.)
>
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