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2005 Honda Civic LX , pressures

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Sep 12, 2017, 7:32 PM

Post #1 of 3 (657 views)
2005 Honda Civic LX , pressures Sign In

2005 Honda Civic LX, automatic, 4 cyl, 4 door. Vacuumed system and added 18oz of 134a. Ambient temp 90 degrees, high side 200, low side slowly moving back and forth from 38 to 41. Center vent temp, 60 degrees at idle with windows down. Drove on the freeway, center vent temp 49.6 at 70 to 75 mph. After getting off the freeway and back on surface streets the center vent temps were low to mid 50's.

Shouldn't the vent temps be lower or am I expecting too much?

Thanks again.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 12, 2017, 8:19 PM

Post #2 of 3 (648 views)
Re: 2005 Honda Civic LX , pressures Sign In

Everything matters to get it just right. Perfectly held vacuum, accurate readings for temps and pressures no air or other contamination. Pressures don't reflect it's charged properly by are in line with performance you see.

You can't allow air in even from hoses of gauges. No junk from the canned Death Kits with gauge that are rarely accurate and sold everywhere. This and others are a very low capacity system so a few % off on anything throws it off that much and performance is much too weak IMO if your readings are correct.

When all is know working properly this is a basic guide to charging a system from full and well held vacuum worth the read,

May have to redo it or be looking for any reason air flow thru grille isn't effective enough,


Hammer Time
Ultimate Carjunky / Moderator
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Sep 12, 2017, 8:26 PM

Post #3 of 3 (644 views)
Re: 2005 Honda Civic LX , pressures Sign In

I don't see any problem at all with those pressures or temperatures. You were reading the temp with the windows down on a 90 degree day.

The thermostat will prevent the temps from going any lower.


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