Well, I thought I'd try one last time since the last time I wrote noone had heard of my problem before. Here it goes: My A/C will not shut off on my 02 Accord even when I toggle it off on the climate control system (it still says off when it's not). On top of that it doesn't cycle on and off properly like it used to before this problem. I thought maybe the clutch locked up on it but when I pulled the fuse for the A/C it shut off and no longer blew cold air.

Any ideas would be greatly appreciated since the Honda dealer doesn't know what's wrong either and I'd really rather not try a whole new climate control system and find out that that wasn't the problem. Thanks!

 

Sound like an electrical switch problem. This is not the real fix, but if you turn the fan off, does it shut the AC off? If it does, see if it comes back on after you turn the fan back on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by acro &raquo;</TD></TR><TR><TD CLASS="quote">Well, I thought I'd try one last time since the last time I wrote noone had heard of my problem before. Here it goes: My A/C will not shut off on my 02 Accord even when I toggle it off on the climate control system (it still says off when it's not). On top of that it doesn't cycle on and off properly like it used to before this problem. I thought maybe the clutch locked up on it but when I pulled the fuse for the A/C it shut off and no longer blew cold air.

Any ideas would be greatly appreciated since the Honda dealer doesn't know what's wrong either and I'd really rather not try a whole new climate control system and find out that that wasn't the problem. Thanks!</TD></TR></TABLE>

What kind of backwater Honda dealer did you go to??

 

If you turn the system off but stays on then you have a stuck relay, bad pcm or bad climate control module.

1) Pull the pressure switch connector @ the receiver/dryer if the compressor turns off then you have a bad climate control unit or the wire is shorted.

2) it it stays on it is a stuck relay or your pcm.

 

I've tried turning off the entire climate sytem but when I do this the A/C compressor continues to run. Seems really strange huh?

I tried looking for the pressure switch connector but couldn't find it. Any ideas where to find some pics online? Thanks a lot guys!!

 

I forgot to add one thing that might help. When I first turn on the car it takes about 2 seconds and then I hear the compressor click on permanently. So I guess the clutch does disengage when the car is shut off.

 

Go to page 11 of this PDF link to see the location of the Pressure Switch Connector:

http://cheaphondaparts.com/sho...2.pdf

 

Sweet! I'll go try to disconnect it now and see what happens...

 

Ok, here is an update on the stuff I've tried:

1. Pulling the pressure switch connector did get the compressor to shut off.

2. Pulling the fuse in the cabin (shuts off entire climate control unit) also shut off compressor. However, turning the climate control unit off didn't turn off the compressor and toggling the A/C off and on didn't work either. Wouldn't turning the climate control module off be the same as pulling the fuse for it??

3. Pulling the fuse under the hood shut off compressor but left the climate control module to keep functioning.

Is it simple to pull the climate control unit out of the dash to check for a shorted wire?

 

Sounds like you have a bad climate control unit. Here is the info on the operation. If you do come to find you need a climate control unit. I have a working one available for sale. It is an auto climate control unit off an 01-02 ex.


How the Climate Control Circuit Works:

The climate control unit controls the blower
controls, air delivery, and A/C compressor controls
either automatically or semi-automatically. The
control unit receives battery voltage at all times
through fuse 13 (in the passenger’s under-dash
fuse/relay box). With the ignition switch in ON (II),
battery voltage is supplied through fuse 3 (in the
driver’s under-dash fuse/relay box). The control
unit is grounded at G401.

Fully-automatic Operation:

To put the automatic climate control in fully
automatic mode, press the AUTO button and set
the fan control dial to AUTO, then set the desired
temperature by turning the temperature control
dial. You will see FULL AUTO in the system’s
display.
The system automatically selects the proper mix of
cooled and/or heated air that will, as quickly as
possible, raise or lower the interior temperature
from its current level to the set temperature. The
system also adjusts the fan speed and changes
direction of air delivery.
When you set the temperature to its lower limit
(60F/18C) or its upper limit (90F/32C), the
system runs at full cooling or heating only. It does
not regulate the interior temperature. When the
temperature is set between the lower and upper
limits, the system regulates the interior
temperature to the set value.

Semi-automatic Operation:

You can manually select various functions of the
climate control system when it is in FULL AUTO.
All other features remain automatically controlled.
Making a manual selection causes the word FULL
to go off.
However, when you select A/C OFF, the system
cannot regulate the inside temperature if you set
the dial lower than the temperature outside.

Blower Controls:

The fan speed is automatically controlled in the
fully-automatic mode. You can manually select the
fan speed by turning the fan control dial clockwise,
just past the AUTO position. This takes the fan from
automatic mode to its lowest manually controlled
speed. Turning the dial further clockwise increases
the fan’s speed, which increases air flow.
Battery voltage is applied through fuse 56 to the
blower motor relay contacts at all times. With the
ignition switch ON (ll), the blower motor relay in the
under-hood fuse/relay box is energized which
feeds battery voltage to the blower motor. The
power transistor controls the blower motor in all
speeds except HIGH. The power transistor is
controlled by the climate control unit. When the
control unit requests HIGH blower speed, it
grounds the blower motor HIGH relay coil,
energizing the relay, which connects the blower
motor directly to ground, making the blower run at
high speed.
In cold weather, the blower will not come on
automatically until the heater starts to develop
warm air.

Air Delivery:

The climate control unit controls the blower motor
and supplies a 5 VDC reference voltage to the air
mixture control motor.
The air mix and mode control motors each receive
inputs from the control unit. The air mix motor
regulates the mixture of cold and hot air by varying
the position of the heater-evaporator door. The
mode control motor controls the direction and
volume of outlet air. Use the MODE button to
select the vents the air flows from. Some air will
flow from the dashboard corner vents in all modes.
Each time you press the MODE button, the display
shows the mode selected. Press the button four
times to see all the modes. Both the air mix control
motor and mode control motor are grounded by
the control unit.
The recirculation control motor receives battery
voltage through fuse 3 (in the driver’s under-dash
fuse/relay box) when the ignition switch is ON (II).
It regulates the position of the fresh/recirc door,
and is controlled by two position inputs from the
control unit (“Recirc” and “Fresh”).

A/C Compressor Controls:

Voltage is provided at all times to the A/C
compressor clutch relay contacts through fuse 58.
With the ignition switch ON (II), voltage is supplied
to the relay coil through fuse 3 (in the driver’s
under-dash fuse/relay box).
With the ignition switch ON (II), the climate control
unit grounds the A/C ON input of the PCM through
the A/C pressure switch. The PCM then grounds
the A/C compressor clutch relay coil. This
energizes the coil, which closes the relay contacts
and provides voltage through fuse 58 to the A/C
compressor clutch. The clutch then engages and
begins turning the compressor. By default, when
the climate control system is on, the A/C is on.

A/C Pressure Switch:

The A/C pressure switch is located in the
condenser outlet line where refrigerant is in a high
temperature/high pressure liquid state. The switch
will sense abnormally high or low pressure, and
open the circuit. This removes ground from the
PCM, and turns off the compressor.
Refer to the Service Manual (Section 21, HVAC)
for specific tests or troubleshooting procedures.

Evaporator Temperature Sensor:

The evaporator temperature sensor is located on
the evaporator housing. If the temperature at the
evaporator gets too cold, the evaporator
temperature sensor sends a signal to the climate
control unit to turn off the A/C compressor clutch.
This prevents condensation from freezing on the
evaporator fins and blocking air delivery into the
passenger compartment.

 

MAKE SURE YOUR NOT ON THE DEFROST SETTING AS SOME CARS WILL RUN THE PUMP IF IT IS ON. TRY IT. SORRY ABOUT ALL CAPS, IM NOT YELLING!

 

Thanks a lot for the awesome replies! I've tried toggling on/off the defroster and that doesn't shut the A/C off either.

How much are you selling the climate control system for and is it a pretty easy job for a newbie?

 

It came out of an 01 v6 ex accord. It will only fit an 01-02 2dr, 4dr V6 EX. It retails for $589 and dealer cost is $389. I'm not looking to get that much for it but please consider the price of the part and make me an offer. Remember it will only fit the accords I listed above.

 

or since your looking to buy a used part why not buy a "used part" from a local junk yard that in most cases will not give you a refund but will keep getting you a/c climtate control units till they get one that works, and the price would be a lot less than wholesale for a new one usually half is the market norm. and remember it would suck to buy a "used part" from a technician who cant stand behind the part he sells.

 

The only thing that I'm still worried about when changing the climate control module is why would the A/C not be cycling anymore? This problem of it always being on (from 2 seconds after the car starts) and not cycling started the same day. I thought the pressure switch was what cyled the compressor not the module. Any ideas on this?

 

It is the pressure switch and the evaporator temp sensor that turns the clutch on and off BUT only when it is necessary. You will need to hook up some a/c gauges in order to perform the switch diagnosis. The switch will only turn the compressor off if the pressure gets too high restriction, overcharge, fan not working) or too low low system charge or other)

 

Hey I am having a similar problem but with my 96 accord LX. When I turn my a/c on my a/c compressor stays off. I took it to Pep Boys and they said that the switch to the compressor is disconnected some where. So I have the a/c compressor hard wired to the battery thats the only way to get it to work but I have to open the hood and disconnect it every time I leave the car alone for a while because it will drain the battery. Also I checked all fuses and they are all good. Any suggestions on what the problem could be???

 

I have a couple of the climate modules. I know they both work. I one does not do it I one to fall back on. I would only be looking to get $200 + shipping for it.

 

The climate control in my 1995 Accord 2.2i VTEC SiR is playing up. By this I mean that nothing at all lights up on the temperature display or the buttons when the key is turned on, then sometimes it burst into life for 10-20 mins. When it is working, it works perfectly - every button does its job just right, and temperature change as selected. I have checked all the fuses and all are OK and seated correctly. The car is running normally and has not been worked on recently. I have no mods of any kind - its the standard package as made by Honda. Having read your input on the forum regarding A/C and climate controls, I thought you might have some answer for me. Please help me resolve this problem as the summers are getting hotter on London and I've got a baby who needs some comfort in these soaring temperatures. All help greatly appreciated.

 

I am in the US, I'm not sure it is the same wiring. Do you have an aftermarket radio installed? It is possible that the connector is loose on the control unit. Try and bang on the dash when it happens. If it comes on then you may have a loose connector. It may be a faulty controller.

 

The climate control in my 1995 Accord 2.2i VTEC SiR is playing up. By this I mean that nothing at all lights up on the temperature display or the buttons when the key is turned on, then sometimes it burst into life for 10-20 mins. When it is working, it works perfectly - every button does its job just right, and temperature change as selected. I have checked all the fuses and all are OK and seated correctly. The car is running normally and has not been worked on recently. I have no mods of any kind - its the standard package as made by Honda. I unplugged the two plugs that go into the controller and noticed that with the black plug connected, the fan was blowing constantly at high speed. When grey plug is connected, the system shut off totally. What could be the problem. Having read your input on the forum regarding A/C and climate controls, I thought you might have some answers for me. Please help me resolve this problem as the summers are getting hotter in London and I've got a baby who needs some comfort in these soaring temperatures. All help greatly appreciated.

 

You said that.....

 

My bad. Everything is original equipment on my car. I willk booked in for a diagonistic at a local Honda dealership. Hopefully they wil find the fault and solution.