When you turn on the A/C, does the radiator fan and the condenser fan
turn on? Do you have fuel injection or a carburetor? When you turn on
the A/C with the engine at idle, does the idle speed increase a bit? Is
this a California car, a 49 state car or is it in an entirely different
part of the world?
The connector to the compressor clutch is in the area where you work
when replacing the timing belt, as is the refrigerant pressure switch.
It is also possible that you have a leak in the A/C system, particularly
if the mechanic had to move the compressor out of the way to get access
(not sure if this is required on your car). If the refrigerant level is
low, the A/C will not turn on.
A very modest collection of Honda tech info can be found at:
Check the bi-pressure switch first. It sits right above the high
pressure port, driver's side of the car close to the condenser. It is in
the pipe going from the receiver dryer, over to the passenger side and
back into the cabin. The pressure switch has two wires going to it, one
BLU/BLK, the other BLU/YEL. Disconnect the wires to the switch and
measure for continuity between the two terminals on the switch. There
should be continuity (with an ohmmeter you should see several ohms at
most). If you do not have contiguity, you either have a broken pressure
switch or you are low on Freon.
With the pressure switch disconnected, turn on the A/C switch and turn
the ventilation fan to any speed except off. Ignition should be off.
Then measure for continuity between the BLU/YEL wire and body ground.
There should be continuity (again, no more than several ohms on the
ohmmeter). If no continuity, it could be a bad ventilation fan switch, a
bad A/C switch, a bad A/C thermostat or a broken wire.
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