Ac Charge Ports

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Kftca
Posts: 15
Joined: Tue Nov 01, 2022 4:10 pm
Location: NS

Ac Charge Ports

Post by Kftca »

Good day all:
I have a 1988 635CSI that is mostly all original including the AC system. The original system was R12 and I intend to check/recharge it this spring . My question: the LP charge port is clearly visible, but I cannot find a HP service port. I noticed an extra hex cap on the drier today while I was working on the car. Is there a HP port under this cap which I can connect my HP gauge to? Pictures attached.

Thanks very much in advance!
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Karl
plip1953
Posts: 406
Joined: Mon Aug 13, 2018 4:15 pm
Location: Leeds

Re: Ac Charge Ports

Post by plip1953 »

What do you plan to recharge the system with? My understanding is that R12 hasn't been available (legally) for many years, but that you can't simply use R134A instead because the the system will get completely clogged up due to a mismatch between oil types each uses.
Phil
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1988 Highline 635 CSi
Kftca
Posts: 15
Joined: Tue Nov 01, 2022 4:10 pm
Location: NS

Re: Ac Charge Ports

Post by Kftca »

Hi Phil: I charged the system using R12a refrigerant. I realize this is quite a controversial subject to use this, but here in Canada it is legal and readily available. As the AC system system looked in good shape and I had just gotten the car I decided to go the first summer on R12a and see how it went. The Ac worked not too bad… 50 deg F vent temps. I want to see if I can fine tune the charge volume this summer as performance is quite sensitive to charge weight I think. Hence my reason that I want to connect my HP gauge to the system.
I am thinking there is a Schraeder valve under that cap on the dryer…. Does anyone know for sure?
Thanks Karl
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