Question about 1994 Honda Civic
You may have a problem with your A/C On/Off switch which is located in the Heater Control Assembly in the dash.
My 1992 Civic had a similar problem that required me to remove the Heater Control Assembly. Next, I had to pull apart the assembly to access the A/C on/off switch. If I remember correctly, there are six solder joints for that switch that connect it to a circuit board. Mine only required resoldering of those six connections and everything works perfectly again. Please note, that my switch appeared to turn on and off with the green indicator changing states when pushed, however, some of the six solder joints were not making a good connection. So, although the light said things were "on" they were not.
Pulling out the Heater Control Assembly is not an easy task, so if you're not particularly handy that way, get yourself some help or instructions on how to do that. Once removed, it's tricky pulling the assembly apart to access those solder joints, but if you're pretty handy and careful, you can do it without damaging anything.
If necessary, you can purchase a new Heater Control Assembly on-line through such places as Majestic Honda for about $240
Just be sure all the easier solutions are checked out before trying this one.
Good luck, Mark
Posted on Jul 28, 2009
I haven't found a really good wiring schematic of the A/C on these cars. But, I can tell you that I had an intermittant problem with my Civic air conditioner that sounds similar to yours.
Mine would work fine in cool and warm weather, but when the outside temperatures got hot, it would quit working. The fan would blow; the system had a good charge on it; and the green A/C indicator light on the A/C on/off switch showed the system as being "on". Despite all the indicators saying the A/C is "on", the compressor clutch wouldn't come on when the weather got hot.
In my case, the reason it stopped working when hot, was due to some poor solder connections at the A/C on/off switch, which is part of the Heater Control Assembly.
I removed my Heater Control Assembly (challenging job), and pulled apart the Heater Control Assembly (more challenging) to access the solder connections for the A/C on/off switch. I resoldered those connections (six solder points) and put everything back together and everything has worked perfectly ever since that time (two years).
I have never seen a wiring schematic that shows this switch with more than three connections, and that is why I haven't posted a schematic for you. If you want the usual schematic(s), you can find one on autozone.com for your Honda.
If you are not comfortable pulling apart the Heater Control Assembly, and soldering those connections, you can install a new assembly which is available on-line. I saw one listed through Majestic Honda for about $240.
I hope this helps.
Good Luck, Mark
Posted on Aug 01, 2009
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Posted on Jan 02, 2017
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