[T3] Heater hose
Brion Sabbatino
brionsab at msn.com
Wed Nov 21 11:58:48 PST 2012
I just need to clarify what the small tubes do. As I understand it they constantly supply cooler pre-warmed air to the Thermostatically controlled mixing valve. I only say that because it seems the air first flows through the small upper heat exchanger on a stock system. Then it continues to the warm air mixing valve on the body.If this is correct I will get to work on a solution.
BrionS.
S. Utah
> From: Bobsnotch at aol.com
> > Yes, the reason is length. On the 64 and very early 65's, the heater
> valve
> > was located on the body, while after Oct 64 (65 MY), the valve was built
> > into the heat exchanger. Prior to Nov 63, the earlier tubing was 55 mm.
> I
> No, it's a very early versus late thing. The early 1500 cars had their
> heater control valves attached to the body (regardless of body style, which was
> Square, Notch, and T-34 at the time), and used heat exchangers without the
> control valve. The size of the tubing (ID) was 55 mm (part number 311 255
> 355B (LH), and 356B (RH). Since the control valves were bolt on, and new
> heat exchangers were available, VW superceded them with the new parts,
> dropping the old ones, since you could still use the newer parts.
>
> Then VW upped the size of the tubing, heater control valves, and heat
> exchangers in Nov 63 for increased heat (311 255 357D, and 358E). The later left
> hose (from Oct 64) 311 255 357E then became available (these part numbers
> came out of the parts book). I think it's slightly shorter than the
> previous hose, but I'd have to measure it to know for sure.
>
> Then in Oct 64, they moved the heater control valves to the heat
> exchangers (making them part of it). This change stayed until T-3 production ended.
> It was probably more of a case of VW working out the bugs of the system,
> and trying to find a way of saving money in the long run. These early cars
> (up to Oct 64) didn't get the extra tube for cooling air to the body. But the
> reason the right tube length didn't change, is that the 1-2 side of the
> engine is further forward of the 3-4 side, so VW had some room to play with,
> and was able to keep that length the same. Think about it for a couple of
> minutes, and it'll make sense. ;-)
>
> Bob 65 Notch S with sunroof and IRS (Krusty)
> 64 T-34 Ghia (Wolfie)
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