air con pump/air compressor

i have a lorry air horn in my car with a 75l air tank hooked up for a reservoir. im currently refilling it by pluging into the main air line in the garage or at a service station with the tyre guage. iv looked around for 12v air compressors but cant find any reliable ones. im running the system at 120psi, big enough pressure. i once heard that an air-con pump can pump air. think i saw it on scrapheap challenge!?! is this true that it can pump air because there is one fitted on my car at the minute so all has to be done is some re-piping etc to get me away.

any knowledge on this subject would be greatfully welcomed.
 

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