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Air conditioning re-gas with three ports


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The LS600hL has the usual set of High and Low ports with a sight glass at the top of the engine, but it also has a second High port and sight glass behind the radiator grille. Does anyone know what the procedure would be?

I know for a fact that the local garage didn't find the port near the grille, because they lost the port caps from the other two. 😞 If they did the usual evac-wait-fill job on those two ports, is my system full now?

It's going to the dealer for a full service next week and I'm tempted to ask them to re-gas it again but on the other hand that's wasted money if it's already done. I got charged £106 from the local garage and that included 900g of gas

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I seem to remember the LS has a rear AC unit for both the rear passengers and active cooling of the hybrid traction Battery. I think there is only one compressor and condenser but two evaporators and I imagine the extra high port is on the pipework that goes to the rear unit?

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