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On the 2002 Sienna the low pressure AC Port is on the passenger side just behind the radiator cap and between the radiator cap and the firewall. This position makes it hard to get any of the cans you can buy at an auto parts store to reach the fitting and still be able to view the gage. Most of the auto parts store charging systems have pretty short hoses. I went to Home Depot and bought a piece of high pressure hose, two brass hose couplers and 4 hose clamps. Extended the hose and I was able to read my gage without needing to be a contortionist.
Good Luck,
Quinton
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