fwiw,
I just looked at some heater hose connections for Jeff today - specifically
the T's for the rear heater.
Yes, it's 5/8ths going to the T, and leaving the T going forward.

but, coming off the T going to the rear heater ...
it's slightly less than 1/2 inch ID ...like 12mm.

and...of course......thank you VW for making hoses differenst sizes on each
end ...
where it gets to the rear heater core - it is 5/8 there again.
I suspect they wanted a restrictor affect slightly for the rear heater, so
the rear one wouldn't take too much flow away from the front heater core.
Scott
www.turbovans.com

----- Original Message -----
From: "Gerald Masar" <azsun99@EARTHLINK.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, March 09, 2010 4:57 PM
Subject: Re: Heater hoses '85 Vanagon

> The author of this chart says 5/8" for all heater hoses:
>    http://www.loam.org/vw/Vanagon/VWtoNapaHoses/
> The chart is for '86 - '91, but should be similar to '85.
> Jerry
>
> ----- Original Message -----
> From: "Jeff Lincoln" <magikvw@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Tuesday, March 09, 2010 10:07 AM
> Subject: Heater hoses '85 Vanagon
>
>
>> Hello -
>>
>> Can anyone tell me if the heater hose (that runs from the front heater
>> core
>> to the T fittings in the rear is 1/2in hose or 5/8in? I'm sure it's
>> actually
>> a metric measurement but the local FLAPS never seem to understand metric
>> :)
>>
>> --
>> Thanks,
>>
>> Jeff
>> '85 GL (Gertie)
>> '90 Carat (Grover - the noble parts donor)
>> '86 (We call this one Scrap)
>> '78 Bus (Melissa) Patty's Bus