scirocco heater controls

[flaatr@yahoo.com (Euroroc II)]

You have two separate problems here... the heat is controlled by a push / 
pull cable that goes from the lower slider to a valve in the engine 
compartment near the firewall and around the brake MC. there is a metal 
clip that keeps the outside part of the cable that hold it in place and the 
wire inside is connected to the control lever and to the valve lever, 
respectively... if the clips are missing then the cable does nothing and 
you are stuck at whatever position you left it at, in your case cold.  Look 
for missing clips on the valve assembly and on the bottom HVAC control.

You can try to move the one on the valve by hand and you should get warm air.

As for where the air comes from this is controlled by a vacuum switch and 
vacuum solenoids... There are two 2 position valves and one 3 position 
valve. If it is stuck in Defog then all the valves are at their default 
position and that means the vacuum selector is not working... There are two 
reasons the selector does not work... one is that it is bad and two is 
there is no vacuum.

Diagnose the problem starting from the source. Look for a T fitting near 
the fire wall on the passenger side with one hose leading to a check valve 
(half blue and half black in line deal)... the other end of the valve 
should go into on of the two spigots that come off the side of the fresh 
air / recirculate flap thingy in the rain try under the rain cover. This 
valve is notorious for plugging up... just remove the valve and reconnect 
the hoses, you may need to temporarily use a longer hose. If everything 
works then replace the valve. this valve just keeps the HVAC system 
isolated from the rest of the engine vacuum so if you shut down the engine 
your flaps stay where they once were... it is safe to drive without it.

If the vacuum check valve is working go to the vacuum switch on the HVAC 
control. Set for fresh air or anything other than defog and start pinching 
off the other hoses till you hear the flaps moving. This should help you 
isolate which solenoid is leaking. The one that controls the fresh air 
vents and defog is a 3 position valve, 2 hoses go too it and is easily 
accessible thru the dash with the instrument cluster removed. there one in 
the  recirculate /  fresh air thing and this is accessible from the rain 
tray and there is a third on the right side of the center console located 
below the 3 position valve.

Good luck

-RGK-

At 09:27 AM 11/24/02 -0700, snowfish wrote:
>HI all,
>
>The heater controls have stopped working in my 87 16v rocco. Both the
>position and temp controls do nothing.
>Can anyone give me a good starting point? The levers slide back and forth
>ok, but nothing happens. Only cool air blows and its stuck in defrost
>position.
>
>TIA,
>
>Ian
>87 16V rocco
>Arvada, CO
>
>
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