TonyK wrote:

Just after any thoughts on this one.

I have an aging "box" type 2hp air conditioner that I'm planning to
replace
in a few months with a split system. It's about 20 years old so it's
seen
it's day.
If powered up cold it cools ok but when the thermostat cuts the
compressor
it fails to restart it several minutes later. You can hear a brief hum
accompanied by the fan slowing a little at it tries to start the
compressor.
It gives up and tries again at intervals without success. Might get
lucky
half an hour later though.
Reading here and there, the general concensus may be an AC capacitor
for
the compressor may be failing or even the compressor itself but bear in
mind
it runs fine from a cold start and continues to run just fine until
that
first thermostat cycle.

I had a thought of cutting off the temperature sensor sitting in front
of
the evaporator and measuring it's "hot day" resistance ( yes it's an
electronic temperature control) then selecting and replacing it with a
suitable fixed resistor. This theroretically will make the compressor
run
continuously but at least give us some cool time when we need it and
keep it
usable until we throw it out.

Any thoughts on my logic here ?

Regards,
Tony

Hi,
Starting cap or centrifugal contacts inside motor?