Likely two different issues ... the clutch that allows the compresser to operate is controled by several things
1. if refrigerant (r134a) is low then the clutch will cycle or not come on at all as the pressure in the system drops below a critical value .. in general if this is the case it may work better (for longer) if it is really hot out .. and maybe not at all when its cool
2. the system detects the fact that the front blower is turned on before it will allow the compressor to operate .. could you have damaged the fan speed switch assembly or wire connectors while kicking or changing the resistor ???
3. the switch that detects low refrigerant pressure could be bad and that switch sometimes operates a relay that has a high failure rate in some car makes ..that would be called the compressor clutch relay, AC relay or some such ...the nature of this relay problem is that the clutch turns on and off randomly then eventually doesnt come on at all ..
if there is no damage to the blower switch or wiring then i would check the refrigerant pressure .. in r134 systems slow leaks are often seen that cause the pressure to drop to the point where the system cant make up its mind about running. typically the compressor will run for a few seconds at a time .. a steady but fast cycling (not random) you can get a r134 pressure gage at any auto parts shop but you should know how to use it or find someone that does ..
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