All Vanagons, diesel or gas, use the same heater core.
But once again, the ’82 hoses are different, as the heater shutoff valve is located under the dash, behind the glove box close to the heater core.
’83 and later Vanagons put the shutoff valve under the floor.
See Part One – Diesel VW Vanagon T3 Coolant Hoses – Engine Compartment – for details on how to read the information below:
(23) Heater Core
* ALL 251-265-303C
(9) Heater Hose (Feed) Front Heater Control Valve to Heater Core
NLA 82CS 251-265-053 (valve under dash)
* 83CS+Later 251-265-053C (valve under floor – could be cut to fit 82CS.)
(10) Heater Hose (Return) Heater Core to Adapter Fitting.
* ALL 251-265-054A (under floor)
Note: my ’82 has both connections under the dash, and used the shorter (NLA) 251-265-053 for both feed and return, as both (9) and (10) are similar at the heater core end.
(11) Heater Hose (Feed) Cylinder Head to Front Heater Control Valve – 3900mm
NLA 82CS 251-265-055B
* 83CS+Later 251-265-055F
82 DIY: The ’82s have 5/8” hose the entire length, except for a 1” connection to the cylinder head. Alan Felder from the Diesel-Vanagon yahoogroup suggests splicing standard 5/8” heater hose to a Gates 19663 hose (NAPA NBH11663) , which has a 1” end and a 5/8” end and is about 43” long. (Gates 18965 – NAPA NBH10965 also has a 1” to 5/8” reduction but is only 35” long). At $215 (list price 02/2010), the stock hose is pretty spendy.
(15) Heater Hose (Return) From Front – 3530mm – Connects to 3-Way Hose (6)
* ALL 251-265-057 (available but discontinued)
82 DIY: if this isn’t just a $225 (list price 02/2010) length of 5/8” hose, I don’t know what is! Most folks recommend about 30 feet of 5/8 hose to replace the stock heater hoses.
Next: Diesel VW Vanagon T3 Coolant Hoses – Part Four - Expansion Tank