My 93 Aerostar air conditioner is cooling but not as good as it used
to. Hopefully, I've just lost a little freon over the years and the
165,000 miles. I have a couple of small cans of R-12, along with a
simple (no gauges) charging kit but I just wanted to make sure which
valve to hook the charging hose up to.
I know from charging the system on other vehicles that you add the
freon to the suction or low pressure line (the one that's COLD). My
Aerostar has a cold line running into, or maybe out of, the
Accumulator beside the heater-A/C blower unit, and there's a valve in
that line about 6 inches before the accumulator. Really convenient to
get to. But there's another valve on the accumulator itself, with
nothing hooked up to it. My guess is that the valve on the cold line
going to the accumulator is where I should hook the hose to charge the
freon, but I'm hoping someone can verify this for me.