AC Controller Q

[Rex Pedersen]

On my 87 5KsQ, the connector pins became unsoldiered. The circuit board
where pins attach needed to be re-soldiered. (this is where the plug
attaches). Wiggling the plug would make the air come out of center vents for
a while until I discovered the problem. Look closely at where the pins are
on the circuit board for any breaks. I think the plug causes vibration.

Rex Pedersen
Ludington, MI
90 V8q
87 5KSq
86 5KS wagon
http://www.fega.com/rex/rexsaudi.htm




> One of my 5K's is giving me fits in trying to fix the AC Controller (the
> vacuum switch part).  The symptoms are the usual air coming out of the
> defrost vents when it should be at the dash vents.
>
> In the past (with other 5Ks) this has not been that big a deal. Yet
> nothing I try on this car seems to work for long. I have tried a couple
> of controller boxes (both have been checked for hose leaks internally).
> I have checked the lines between the controller and the right vacuum
> actuator and they are good, no leaks and they do pass air.  The vacuum
> actuator does work (will move when vacuum is applied).
>
> When I work on the system I can ususally get things to work before I put
> the under-dash back together, yet a day or two later it is back to not
> working.  The only thing I have not  checked is the actual vacuum level
> at the controller.  Anyone know what vacuum should be on the black
> "input" line at idle???  However since other vacuum actuated things seem
> to move OK (like the air recirculating door) I have been assuming that
> the vacuum level is OK...
>
> Any ideas of where else to look on this one??