RE: [doc] Mode switch

["Richard" <dickyh11@xxxxxxxxxxx>]

The first setting operates a heater valve in the engine bay, which cuts
off the coolant to the heater matrix, to help the A/C cool the cab
faster.

If this valve is broken, or the tube has come off, that will cause the
mode switch to hiss.

The thin black plastic pipe runs from the front (remember 'front' is
closest the rear window) of the left pod in the engine bay past the
dizzy, to a valve just infront of the right hand rocker cover. Check the
pipe fitting hasn't broken off.

If you *carefully* remove the pipe, and block it up. The hiss should
stop, if not, you have a leak elsewhere.

The valve is not essential, the A/C still works just as well.....

Rich H
DOC 365 VIN 1274



> -----Original Message-----
> From: doc-uk@xxxxxxxxxxxxxxx [mailto:doc-uk@xxxxxxxxxxxxxxx] On Behalf
Of
> Chris Hawes
> Sent: 08 August 2005 19:39
> To: doc-uk@xxxxxxxxxxxxxxx; dmcnews@xxxxxxxxxxxxxxx
> Subject: [doc] Mode switch
> 
> I rebuilt the mode switch 6 months ago and have just found that it
will
> constantly hiss at me 'quietly' when turned one turn to the right from
the
> off position.
> 
> I have taken the mode switch apart and the diaphram looks fine and
> lubricated.  The clip has only one prong that holds the coiled spring
in
> place but it worked before.
> 
> If I take the rubber boot off the back you have your continuous air
> running from one of the exit holes which when re-attached behaves as
the
> following:-
> 
> switched off - silence
> any setting - a quick swish sound and then quiet except for the first
turn
> as per above.
> 
> Can anyone suggest anything to what the cause may be?
> 
> Thanks
> 
> Chris H.
> 



            
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