Diesel VW Vanagon T3 Coolant Hoses – Part Three – Heater Hoses

March 9, 2010
Click to Enlarge

Click to Enlarge.

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)
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.

Previous: Diesel VW Vanagon T3 Coolant Hoses – Part Two – Radiator Hoses

Next: Diesel VW Vanagon T3 Coolant Hoses – Part Four –  Expansion Tank

Not surprisingly, the 1982 Diesel Vanagons have a unique radiator, as gas Vanagons were still aircooled.  The next year, everyone go the same radiator, gas or diesel.  '82s also have a metal additonal metal feed pipe leading to the top of the radiator from the long underbody coolant pipes.  '83s also share the smaller (1.25”) diameter metal coolant pipes, while later gas Vanagons moved to larger (1.5”) diameter plastic coolant pipes.

NLA 82 CS 068-121-253A  (CS >>24-C-175 000)
* 83CS+Later 068-121-253E (CS 24-D-000 001>>)

(8a) Radiator Feed Hose from Pipe. (not 82)
* 83CS+84?? 251-121-083G from small diameter (metal 1.25”) pipe.
* late CS 251-121-083H from large diameter (plastic 1.5”) pipe.

(9) Radiator (Feed) from Front Pipe & to Front Pipe from Rear (small diameter metal 1.25”) Feed Pipe. (82 only)
* 82 N900785.02  32x4x70mm (2.75" – need two - 82s have an additional front metal pipe for the radiator feed)
DIY: 1.25” heater hose.

(10-10a) Radiator Hose (Return)
* 82CS+83CS+84?? N901666.01 32x4x650mm (25.5”) to small diameter (metal 1.25”) pipe.
* late CS+KY+JX 251-121-082 to large diameter (plastic 1.5”) pipe.
DIY: 1.25” heater hose.

4 Responses to “Diesel VW Vanagon T3 Coolant Hoses – Part Three – Heater Hoses”

  1. rob ryan Says:

    Good work u doing documenting all this info. In UK, my VW 1985 T3 1.6D engine to cabin heater hoses need replacing. VW stopped selling ’em in 2003. Do I a) use similar diameter standard rubber coolant hose from a roll cut to length, b) use domestic copper plumbing tube, c) use plumber’s modern plastic domestic hot water pipe? Thoughts?

  2. dave Says:

    thanks for all of this, I am doing them all now on my 85 with the engine rebuild out of the way, agree we need to support the good suppliers left!

  3. Will Taygan Says:

    I got a good price by buying a full 50 foot roll of 5/8″ heater hose, and ended up using over 40 feet of it for the heater hoses. This may be because the heater valve connection in the ’82 is under the dash, so I needed an extra length to thread it up there.

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