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need help with my installation of air con

I'm in the process of installing air con into my HR, now my question:

I'm using some old used air conditioning hoses for my setup, now a couple of the hoses have a fair bit of muck inside them, it seems like old dried up remnants of the gas. now i'm wondering if its still okay to use them with the muck inside them?

a picture of a bit of the dirt is below (sorry for the poor quality):
http://users.bigpond...

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I'd give it a good clean out, you don't want to take the chance of having anything nasty going into your new air conditioning and shortening it's life.

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How old are the existing aircon hoses?
If the hoses are old enough then they might have been used with R12 refrigerant and oil. If this is the case and you will be filling with R134a instead, then you may be better off with new hose designed for R134a which I suspect runs with higher pressure.
As well, what solvent would you clean the hoses with that might not affect the hose?

Any remaining R12-compatible oil would not be good in a R134a system.

You should be fitting a new receiver/strainer/dryer anyway, might as well go for new hoses.

While I have not priced new aircon hose lately, perhaps some hose specialist business like Pirtek could advise, and you can have a nice custom fit to keep it all neat.

What kind of unit are you fitting inside the car, old-school knee-freezer?

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