The ac trips very frequentely - 1995 Honda Civic

What type of heater exactly ?

check for faulty thermostat

dont worry just try to wash the engine radiator and the ac radiator fins with high pressure water. probably insects got stuck in the holes reducing air flow thus heating the car and tripping the air conditioner.
if air mixes with gas the the ac will not work more than few minutes as the moisture trapped inside will block the capillary tube. no way

there is an AC clutch relay located in the under hood fuse box. This part seems to go bad frequently. $11 at rockauto.com. The relay is marked MG/CLT. This controls the clutch that activates the compressor

Our local Police are targetting Volvo drivers for just owning one!

This is the start of many problems - trade it now.

From Steve - Western Australia

could be a dirty fuel filter

replace radiator

over heating of the condenser(fans not working) or a blockage in the system maybe expansion valve

did you add freon to your system if so how much try letting some out.

a/c control head starting to mess up internally