Air conditioning recharge

SPEED2000

MEMBER
9 POSTS
1988 HONDA CIVIC
4 CYL
FWD
MANUAL
240,000 MILES

I'm trying to figure out the location and which of the 2 valves is used to recharge the system on a 88 civic.
I know the vlaves on the civic are the old styles and they need to be fitted with the new adapter which is compliant to the new freon that is used.
And the caps are color coded, I beleive black, and green.

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Tuesday, July 7th, 2020 AT 1:17 PM (Merged)

KHLOW2008

MECHANIC
41,814 POSTS

Hi speed2000,

The valve on the pipe connected directly to the condenser is the high pressure.

Use the other one for recharging.

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Tuesday, July 7th, 2020 AT 1:17 PM (Merged)

STEVE W.

MECHANIC
13,443 POSTS

Okay, no vacuum will cause an issue as the air and moisture in the system will compress differently and the moisture can also create a higher pressure as it goes through the compressor. I would pull a good vacuum and let it run a while to get as much of the moisture and air out. Then see if it will hold a vacuum. Now charge it and see what you get for pressures.

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Tuesday, July 7th, 2020 AT 1:17 PM (Merged)

SPEED2000

MEMBER
9 POSTS

Still didnt find it, do the caps have a certain color. Where is it exactly?
How much do you fill.

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Tuesday, July 7th, 2020 AT 1:17 PM (Merged)

KHLOW2008

MECHANIC
41,814 POSTS

Hi speed2000,

Sorry, I am used to RHD and is not sure about LHD. RHD is found near left side strut on wheelhouse.

Check the pipe coming out of the evaporator, the low pressure valve should be found on it. It is slightly bigger than the high pressure valve which should be located near the condenser.