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1994 civic,air conditioning problem, when the day is warm, the AC is working fine, when the day is hot, there is no cold air coming out.

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I had the same problem with my 1992 Civic.
After an exhaustive search on the internet, I found that a few others had been battling this problem also. Mine went on for a couple of summers before I finally got serious enough to find it.
You will want to try all the usual fixes for this sort of problem, such as making sure there is enough refrigerent in the system. If the usual checks and solutions don't help, you may have the same problem that I did.
Be warned though; this is no easy task. It seems that some of the solder joints in my Heater Control Assembly were a bit weak (sometimes called cold solder joints, or dry solder joints) and although my green A/C "on" indicator light would come on and go off when I would press the button, the switching never actually occured. This is because there are another four solder joints for this switch alone. That's right, if my memory is correct, there are a total of six solder joints for that A/C switch, located inside the Heater Control Assembly.
When the weather is cool, the solder joints seem to be OK, but when things get hot, the metals expand, and you will lose the connection.
It's quite a lot of work to remove the Heater Control Assembly, and you need to be careful pulling apart the unit once out of the car, but if you're mechanically inclined, it can be done for just the price of a little solder.
If you don't trust yourself with pulling apart the assembly and resoldering the connections, you can also replace the assembly. I found it listed on-line at Majestic Honda for about $240. It appears to me, that the Heater Control Assembly in my 1992 Civic is the same part as those used in several other years, including your 1994.
I hope this helps.
Good-luck, Mark

Posted on Jul 28, 2009

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Probabley low on gas and needs a new dryer a/c place can tell you in 10 seconds flat thats the best place to start youdoit

Posted on Jul 27, 2009


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