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A/C programmer fix
A few people contacted me to ask how I fixed my programmer. I am
embarrased to relate this low-tech story.
Tried the solder/parallel wire fix posted earlier with no results;
still had air coming out the defrost vents. So, took out programmer
once again. Took my batt charger, and applied power to the solenoids
directly. Pos pin on left (looking at component side of board) and neg
on right. Momentary contact, heard solenoid click, another as it
released. Problem was, only 2 of the 4 solenoids on the board were
clicking. In row of 3, center click was anemic and right side unit
didn't click at all. Couple dozen tries later, both were clicking
well. Before I put unit back in, manually moved the flaps/levers on
the vacuum servo used to move defrost/dash vent flap. It didn't appear
to be stuck. BTW, vacuum solenoids would only work in an upright
position. No clicks when lying down, as on a bench. :)
So, possible stuck or sticking solenoids? No oil in hoses...I pulled
them all to check. Lower voltage from A/C head not sufficient to
overcome reluctant solenoid? It was late and I didn't check. Car had
sat unused for over a year...
I'm reluctant to say for sure if the system is cured; I only tried it
for a short time in my garage, and will be taking the car out for a
longer drive this weekend.
One other note...
I shook the board (gently) before I re-installed it, and could hear
the solenoid's inner parts sliding up and down inside the housings.
Nothing blew up, so I guess I got off lucky...
'87 5K CST, now cool enough to ride in back...