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how you doing ? first you need to go to a automotive store and buy a air vac. you'll have two fittings on the ac system. high and low out put ,the high out put is on the line and the low on the canister. hook up air vac to the canister fitting and hook air hose to the vac and this will drain the ac system

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Q: How do you drain the cooling system in a 91 Pontiac Transport?
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