Gas and Oil Home Heating Furnaces - A/C recenlty came to a halt

I'm a rookie at this stuff, so forgive me...
After the heat wave in August, my A/C just decided not to work. My fan works, however the A/C does nothing. Being that the A/C does not even hum, I assumed that it is either the breaker switch or the thermostat (the thermostat is fairly old). I haven't put forth any effort on the A/C yet. I would greatly appreciate any advice or blind diagnosis of what the problem might be and what I can do before dipping into my wallet for a pro.

Thanks

Hi,

Is this a split-system,(Inside Furnace/Blower Unit and Outside Condensing Unit)? When you state "the fan works",is this the inside or outside fan if this is a split system?

One thing you can do to check the t-stat,is to turn off power to the Outside Condensing Unit and the Inside Furnace/Blower unit (This will turn off power to t-stat),then remove cover(s) to t-stat to get to sub-base and the t-stat wires. Disconnect the Red,Yellow and Green wires,tie them together and wrap ends with electrical tape.Turn ALL the power back on and if everything comes on and works ok,replace the t-stat. Do you have an Electrical Multi-Meter to check for Voltages and Continuity?

Write back with these answers and results from t-stat by-pass check and we'll go from there. Take Care and Best Wishes.

CoolBreeze

Yes, I do have a split split system; The fan is inside and the condensing unit is outside. It is the inside fan that is working.

As a matter of fact, I can set the t-stat to "auto" and "cool" and adjust the temperature that determines when the outside unit should automatically turn on, and only the inside fan turns on. Does this mean that the t-stat works?

I haven't tried your method of connecting wires yet, but I will as soon as I get home. And no, I don't have an Electrical Multi-Meter. All I have is one of those things with two wires and a light to check wall outlets.

I'll let you know what happens with the by-pass check as soon as I find out.

Thanks CoolBreeze