Have you checked your system pressure? Are you sure that it is kicking out for high pressure? and not low pressure and just need a bit of charge? If it is kicking out on the high side for a clogged expansion valve you have to remember that an A/C system is a sealed system, if there is debris inside of the system and has clogged the expansion valve that there is only once place for it to come from and I would expect to be changing the compressor soon.
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Have you checked your system pressure? Are you sure that it is kicking out for high pressure? and not low pressure and just need a bit of charge? If it is kicking out on the high side for a clogged expansion valve you have to remember that an A/C system is a sealed system, if there is debris inside of the system and has clogged the expansion valve that there is only once place for it to come from and I would expect to be changing the compressor soon.