A/C problem

Hi david knisley,

Symptoms indicates a possible fault with the PCM or communication error between the multiplex control unit and PCM. The compressor clutch relay is controlled by the PCM Terminal E 18.

This model is known to have faults with the PCM circuit for the compressor but most of them are for the compressor not engaging after some time.

This guide can help us fix it

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.

Honda Civix Vp 2004 Ac/Heater does not work

Is the fan not working?

fan is not working

Okay... Here is the order I would do things. First, make sure the fuse isn't bad. Next, check for power to the blower motor. If there is power, the motor is most likely bad. If no power, you need to work back through resister, relay, and switch to see where power is lost.

Air Conditioning problem
2004 Honda Civic 4 cyl Automatic

Hi,

Could someone please provide me with the A/C schematics for 2004 Honda Civic if you have one? My friend and I are trying to figure out why my A/C doesn't work.

The following are checked, but he decided that there is a relay problem. If we have the schematics it would help us a lot to trace the problem. Thank you.

1. Compressor OK
2. Fuse OK
3. Dryer Receiver OK

Could someone please provide me with the A/C schematics for 2004 Honda Civic if you have one? My friend and I are trying to figure out why my A/C doesn't work.

You sure it has the required freon in it and also if the clutch engaging the compressor

[quote:185f0be863="rasmataz"]Could someone please provide me with the A/C schematics for 2004 Honda Civic if you have one? My friend and I are trying to figure out why my A/C doesn't work.

You sure it has the required freon in it and also if the clutch engaging the compressor[/quote:185f0be863]


Thanks for the reply. Yes, I forgot to mentioned that we also checked the freon level and it was okay. The clutch does engaged the compressor, but doesn't disengaged automatically.

Your problem is coming from the HVAC unit

[quote:752fa24024="rasmataz"]Your problem is coming from the HVAC unit[/quote:752fa24024]

Thank you very much. I really appreciate your help.

[quote:f2e04b7da4="rasmataz"]Your problem is coming from the HVAC unit[/quote:f2e04b7da4]

Hi,

Do you happen to know where this HVAC unit is located? Could the problem also be the Accumulator? Sorry for lots of questions.

2004 Honda Civic ex. When started in cold weather the car will not warm up. After running for 7-10 minutes on the hiway it will then start to blow hot air thru the heater but as soon as I get to a stop sign or anytime it needs to idle, it starts to blow cold air again within 10 seconds. We tried changing the thermostat, no help.

It's the main control of the AC/Heating system.

Test the thermostat and check the coolant level and inspect the air blend door/actuator-vacuum

Thanks very much.

MY A/C was working on Friday. When I got in the car on Saturday. It stayed cold while it was working then all of a sudden just would not work anymore. The blower doesn't even come on when I turn on the blower switch. Even if i just turn on the heater the blower will not come on. All fuses that I can find are good. Even the cooling fan runs but I don't know if there is a separate fan for the A/C. What else besides fuses can I check? If there is a relay problem how do I test it?

Hi bscott157,

What you are facing is a fault with the blower fan motor.

Try banging on the blower motor housing and test if the blower starts working. If yes, the motor carbon has worn off and requires replacement.

[quote:af01816bc6="KHLow2008"]Hi bscott157,

What you are facing is a fault with the blower fan motor.

Try banging on the blower motor housing and test if the blower starts working. If yes, the motor carbon has worn off and requires replacement.[/quote:af01816bc6]



Would this keep the a/c compressor from kicking in?

No, the compressor should still kick in if it is turned ON. Just that the compressor might not stay on for too long as the cooling coil would be cold and when that happens, the compressor would cut off.

[quote:970831be8a="KHLow2008"]No, the compressor should still kick in if it is turned ON. Just that the compressor might not stay on for too long as the cooling coil would be cold and when that happens, the compressor would cut off.[/quote:970831be8a]






The compressor isn't coming on either. Nothing with the a/c works at all now and this just happened all at once. Could the blower switch inside the passenger compartment be bad since the blower wont come on when the heater is set to come on as well?

My Air conditioning system feels cool but not up to it capacity, when i open the bonnet and start the AC i can see and feel it starts and stop. this happend continuesly.

I also checked with a AC tester, when the AC is on on the Lower side goes up to 60 and higher side come up to 50and stays on

can anyone help me pls?

It would more likely be a fuse problem since so many items failed at the same time.

Check the underhood fuses.

Hi azee13,

Are you sure the high side is reading 50 psi?

[quote:0034b73ebb="KHLow2008"]It would more likely be a fuse problem since so many items failed at the same time.

Check the underhood fuses.[/quote:0034b73ebb]

All those fuses are good as I stated in the original question. Are there any more fuses anywhere in the vehicle that could be causing this? Could it be a relay?

yes, Then i got the gas refilled. it seems like cooling but the start n stop problem is still there, some sort of motor trying to start then last for about few seconds then stops ans re-try again. when is happen i feel the whole car is vibrating.

guys u r wondeful, keep up the good works and i'll soon donate after my pay day. thank u ever so much

Here are the schematics for the AC. Check through them for fuses and relay. Here is a guide to help you test the relay and wiring diagrams to help you see how the system works.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know what you find.

Cheers

The high side should be operating at between 180 to 250 and I am surprised it is showing 50.

The low side should be around 30.

When compressor has been stopped for a while, both readings should read at abut 90. Please recheck the pressure reading.

Thanks Guys, I've got it sorted, Gas re-filled and now its working fine. Cheers

Thank you so much it was the blower motor relay on my car :)

You're welcome and glad to know you have fixed the problem.

By the way if the gas level was low, you should monitor the situation aa there could possibly be a leak somewhere and problem would recur.

Yes, I've got dyed and detected using a ultra violet torch, leakes fixed.

you r great guys, its really good to have some one to turn to when we have problem like this. keep up the good work. God bless. Thank u