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Picture showing Low-Side Service Port on a 2004 Toyota Land Cruiser.

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All service work should be performed from the low-side service port. The high side service port is used for pressure testing only. NEVER charge refrigerant into the high-pressure side, as the pressure could cause the refrigerant can to burst resulting in serious injury.

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Picture showing the Low-Side Service Port on a 1999 Mercury Sable.

Picture showing Low-Side Service Port of 1999 Honda CRV.