Its a 94 Civic DX and my A/C will work one minute and then it will just start blowing hot air. Then after 10-15 min it will kick back on cold. When its blowing hot air, the condensor fan is not spinning. All fuses are good and freon is full.

Does anyone know what I should check or possible change?

Thanks

 

I would check the realys, if not that pressure switch could be bad.

 

up

 

Fan not on.... your AC will not turn on...

 

Does the compressor clutch also disengage when the A/C stops blowing cold? If so, try jumping the pressure switch connector and then the thermostat connector when the A/C won't blow cold.

 

Im not sure about the compressor clutch, and where is the pressure switch? Ill give that a try when it happens again.

 

You should hear a click sound when the clutch engages or disengages. The engine will also idle up or down when the clutch engages or disengages, respectively.

Dual pressure switch:

 

The compressor clutch doesnt engage when its not working or blowing cold.

Thanks for the detailed pic. I will try jumping the switch. What am I looking for?

 

bump ?

here's a thread on AC's:
https://honda-tech.com/forums/honda-accord-1990-2002-2/constant-air-conditioning-problems-2595103/

i have a similar problem with my AC. When it works, it works fine. But when it gets too hot in the car, my AC just won't blow cold air. I don't even think the compressor starts to run. I think it may be the internal thermostat sensor switch.
What do you guys think?

 

^ sounds very familiar.

 

Look for whether jumping the connector allows the A/C clutch to engage when it previously wouldn't.

 

I got a chance to jump the connector today. Nothing happened.

 

bump also having issues with my ac

 

Does the condenser fan also fail to run when the A/C won't blow cold? Try doing the same test that I mentioned for the pressure switch on the A/C thermostat (thermoswitch) connector on the evaporator.

 

The condensor fan does work also. Okay I will give that try.

Thanks.

 

I think you meant to say that the condenser fan does NOT run when the A/C blows hot and the compressor clutch won't engage, right?

 

Right! damn typo.

Whats the easiest way to locate the thermoswitch your speaking of? Its different from the one that goes to the radiator hose correct?

I also noticed that when its real hot outside around 80-85 degrees, thats when it doesnt engage and work. It likes to be nice when its around 70-75 degrees and late nights.

 

good thanks for the information my a/c doesn't work either....

 

See diagrams below. If the switch turns out to be fine, then the heater control panel might be bad. This is a common problem of 5th generation Civics.

 

thanks, I'm also going to try and test and/or bypass those switches soon.
Where did those diagrams come from?

also, if this a/c problem is such a common problem of 5th gen civics , then why is it hard to find info on how to fix it?!

 

I have read several threads on the forum where a person's A/C won't work in hot weather, and the problem turned out to be a bad heater control panel (circuit board). You may want to do more searches for such threads. Click here for one member's experience that I could find.

 

I think my ac/heater control panel might be the problem. When it went hot on me, I tried banging on it and cold air came right back on. I also have to bang on it at night to get my lights to come on , so it might just be a bad unit.

Thanks for your help RonJ!

 

yeah thanks man!!!!
http://honda.lioness.googlepages.com/airconditioning
this page was reallllly helpful.
I opened up my dash and pulled out my heater control panel (pain to get out). And when I got to the circuitboard, I found that the solder joints were all cracked - which means my A/C button didnt work! I soldered it back together nicely (i have pics if u wanna see) and i recharged my A/C.
So hopefully, this week i'll experiment and see if my a/c works better in hot weather.