83QV cabin air system dead

1. Does the cabin blower work at full speed, but not at any lower speed?

or

2. No cabin blower at any speed?

 

Yes not a bad idea to check. It many times only works at full fan speed on my '85 QV Cab. It is correctly charged with R12 and blows very cold. Sometimes the lower far speeds on the dial work. Doesn't bother me enough to look into it further. I chalk it up to "Italian charm".

 

Probably, either you have no +12V power to run the AC system, or the Pushbutton/ECU requesting the HVAC system to turn "on" has failed in some way. To functionally confirm that there is +12V power available to run the AC system, first unplug the w connector to see if the terminal with the two brown wires is horribly burned up. If it seems OK, plug it back in, and measure the voltage between the brown wires in the w connector and ground for the two conditions described in this jpeg (this pic is actually of a Swiss Mondial 3.2 fuse-relay panel so the wiring is different, but the general connector locations are the same):

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Please advise your results for Test 1 and Test 2 (if you pass both = bad sign for the Pushbutton/ECU itself, but still can be a bad connection somewhere).

 

Power supply is fuse number 18 from lh side (20A). and the relay is middle row, 2nd in from rh side ( bosch 0332014113). Same as relay for low beams so you can swap to prove it is working. Relay for low beams is middle row and 4 in from rh side

 

Well, having your w connector being cut to pieces is maybe a subtle clue that there's been trouble at those brown wires before . Having the female spade-style terminals used instead of the 2-prong female terminals is a good step up terminal-wise for connection reliability, but it still requires the wires be properly swagged to the terminal (those don't look too good IMO).

The green wires don't have anything to do with the HVAC system, but they do supply all the power from the key controlled services relay to run the key controlled items (windows, etc.).

But glad you've got it working!

 

And you were concerned you might not have something to do over the weekend