"brassplyer" wrote in message
...
Have a Trane central system installed in 88. Model T V030 A140A0

When I last ran the A/C a few months ago it seemed to be working fine.
Usually when it fires up, you can hear a shursssshhhhh-shurrssssh
which I gather is freon starting to move within the system and you can
feel the bubbles in a tube at the front of the air handler housing.

Now when I fire it up I get no freon sound and no cool air. The air
handler is funning and the fan on the compressor unit outside is
running. I depressed the Hi Press fitting a really quick hit just to
verify there's pressure and there is.

It actually exhibited this behavior years ago when it was newer - a
few restarts seemed to get it kicked into gear, but so far no luck.

I'm not versed in A/C but am otherwise mechanically inclined, no
problem whatsoever digging into things with proper direction. Any
primary suspects I should look at before calling someone in?

Thanks for all input.


If there is any Freon (refregerant gas) in the system, it will have
pressure. YOu need to verify the compressor in outside unit is running.
There is probably a relay that will pull in to power the motor when it
starts up. A clamp on amp meter would tell if the compressor motor is
drawing current.

In simple terms the compressor is going to compress the gas, it goes to the
outside coils and is condensed into a liquid as it gives up the heat to the
outside air. It then goes inside and absorbs heat from the inside coils,
boils in doing so and back to the compressor.