[DML] Air Conditioner vacuum controls, tech help please.

["Joe OBrien" <joeyoseppijoe@xxxxxxxxx>]

Well,

I've been working on the AC system on 16851 for a few weeks now to 
get it ready for summer. Most everything seemed ok on the car, but 
there was always one kinda weird scenario in the controls via the 
mode switch.

First off, I alone with some talented help, vacummed down the AC 
system for an hour and it sucessfully held a vacuum in the garage 
for over 24hrs. We then proceeded to go ahead and charge the system 
with R-12. Everything went fine in charging it, the compressor & the 
fans cycled normally once there was once again pressure in the 
system.

The weird part of this scenario is that the air conditioning is 
working beautifully, nice & cold, but I cannot get ANY air to blow 
from any of my vents anymore. During the winter I only had access to 
the heater settings & defrost. I never got a response from the mode 
switch when on any of the AC settings.

I also need to rebuild/repair the mechanism that controls the center 
vent to open when vent is selected, just the door vents blow air. 
Mainly I only got a response from the fan motor when I had the mode 
switch on heater, defrost, or vent, and in vent, just the door vents 
worked, center vent was still messed up.

Now as luck figures, the day I charged up the AC system I lost my 
fan settings in all positions. I have the new circuit breakers and 
all new fuses, all the contacts have been cleaned. I know the 
resistor that usually takes out the fan speeds usually only takes 
out 2 of the speeds, but this time all 4 speeds are out.

I know the AC is working because if I select the AC and while 
driving it will slowly trickle out nice and cold, but with no force 
from the fan to actually cool the interior suffeciently.

I'm guessing the problem must be somewhere in the vacuum lines which 
control the vents from the mode switch? There is no hissing to 
indicate any leaks in any settings on the mode switch.

ANy ideas if this sounds like an electrical issue, or an issue with 
the vacuum system that operates the vent controls?

Any help or advice is apreciated.

Thanks,

Joe O'Brien

2524,
16634,
16851












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