Two Low pressure a/c ports? 1991 LS400
10-25-10, 11:17 AM
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Pit Crew
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Two Low pressure a/c ports? 1991 LS400
Hi,
It seems like my 91 LS400 R-12 has 3 service ports. My A/C is starting to feel warm, so I want to hook up a manifold gauge set to read the pressures. I found the high side port (with black cap) behind the passenger headlight below the air filter. However, there appear to be two low pressure ports, both with black caps, by the passenger side firewall. Anyone know why there are 2, and which one I should use?
It seems like my 91 LS400 R-12 has 3 service ports. My A/C is starting to feel warm, so I want to hook up a manifold gauge set to read the pressures. I found the high side port (with black cap) behind the passenger headlight below the air filter. However, there appear to be two low pressure ports, both with black caps, by the passenger side firewall. Anyone know why there are 2, and which one I should use?
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