We're adding and testing new features:  Create your Garage, used it? Give us some feedback here.
Honda Civic Forum Home - Honda Civic Classifieds - Civic Photo Galleries - Create an Account

Go Back   HondaCivicForum.com > General Automotive > Mechanical Problems & Technical Chat
Sign in using an external account
Register Forgot Password?
Search



Welcome to the HondaCivicForum.com.
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
  #1  
Old 05-18-2008, 09:05 AM
 
Join Date: May 2008
Posts: 12
Default 2002 Civic A/C trouble shooting

Hello! I've been reading in this forum for awhile now and had to register today so I could ask for advice. My civic's A/C starting working intermittantly last summer. I took it to have it vacuumed out and then recharged andsince that point it hasn't worked at all. I bought a spare compressor and when I hook it up outside of the car, the cooling fans come on just like they should, only they come on whether the AC is on or off. I disconnect the spare andfans shut back off.I jumpered the thermal switch on the compressor still in the car and the clutch/cooling fanskick on and the AC gets ice cold very quick. I could leave it this way, only the clutch stays engaged all the time, even if the AC is turned off. Without this jumpered, the clutch/cooling fans won't come on with the AC at all. My theory is that something is keepingpower going to the clutch all the timewhich in turnburned out the thermal switch sometime last year leaving me with 2 issues. I'm opento any and all suggestions as I have an appointment with a honda dealer this wednesday and am trying everything to prevent this very expensive option. Thanks!Matt
Reply With Quote
  #2  
Old 05-18-2008, 11:02 AM
RonJ's Avatar
Recognized HCF Member
1997 Honda Civic
 
Join Date: Sep 2007
Location: Houston, Texas
Posts: 9,450
Default RE: 2002 Civic A/C trouble shooting

Unhook the new external compressor to bring system back to stock. Then, see if you can retrieve a DTC:

(Edit: Are either fuse 1 or fuse 14 blown? Have you tested the compressor clutch relay?)

Click the image to open in full size.

Click the image to open in full size.
Reply With Quote
  #3  
Old 05-18-2008, 01:21 PM
 
Join Date: May 2008
Posts: 12
Default RE: 2002 Civic A/C trouble shooting

I checked and just rechecked all fuses and relays in the system and all are in working condition. I ran the diagnostic and had no flashing light to indicate any problems.
Reply With Quote
  #4  
Old 05-18-2008, 04:13 PM
RonJ's Avatar
Recognized HCF Member
1997 Honda Civic
 
Join Date: Sep 2007
Location: Houston, Texas
Posts: 9,450
Default RE: 2002 Civic A/C trouble shooting

Why don't you think that the problem will be fixed by replacing the thermal protector? Why not try swapping the thermal protector in the old compressor with the one in the new compressor?
Reply With Quote
  #5  
Old 05-19-2008, 03:16 AM
 
Join Date: May 2008
Posts: 12
Default RE: 2002 Civic A/C trouble shooting

Before I replace the thermal protector, I want to fix the issue of the AC staying on all the time. As I mentioned before, when I plug the other compressor in, the AC gets power all the time, even if the AC is shut off which is the same as the compressor thats currently in it with the jumpered thermal protector. I know the thermal protector isone of the issues, trying figure out why the compressor clutch is engaged all the timeand not with the AC switch.
Matt
Reply With Quote
  #6  
Old 05-19-2008, 05:05 AM
RonJ's Avatar
Recognized HCF Member
1997 Honda Civic
 
Join Date: Sep 2007
Location: Houston, Texas
Posts: 9,450
Default RE: 2002 Civic A/C trouble shooting

Does the A/C run independently of the blower motor?

Look for a shorted/damaged wire between the ECM and heater control panel:

Click the image to open in full size.

Click the image to open in full size.
Reply With Quote
  #7  
Old 05-19-2008, 07:13 AM
Recognized HCF Member
 
Join Date: Jun 2007
Posts: 9,717
Default RE: 2002 Civic A/C trouble shooting

It's OK to jumper the thermal switch for testing purposes. I think Ron's diagram isn't exactly what you have. Some models have the thermal switch connected directly to the clutch as shown and others have low-level wires that go into the control system from the thermal switch.

When you have that latter system and there is a short to ground in the thermal switch or it's wiring the compressor and fans will stay on all the time. The way it works is the A/C control panel pulls the blue wire on pin 4 to ground to demand A/C (control panel checks that interior fan on, driver has pressed the A/C button, and the evaporator temperature is above 40 F). This signal passes thru the thermal switch and the pressure switch to the multiplex control unit. The multiplex control unit sends a command to the ECM. If the engine is running at a proper RPM, the ECM then closes the compressor and fan relays.

Check for shorts to ground on the wire between the control panel, switches, and multiplex control unit. If you can unplug the control panel (disconnect battery first since there is a computer in it) and the A/C stops, the control panel may be bad.
Reply With Quote
  #8  
Old 05-19-2008, 02:10 PM
RonJ's Avatar
Recognized HCF Member
1997 Honda Civic
 
Join Date: Sep 2007
Location: Houston, Texas
Posts: 9,450
Default RE: 2002 Civic A/C trouble shooting


Quote:
ORIGINAL: mk378
I think Ron's diagram isn't exactly what you have. Some models have the thermal switch connected directly to the clutch as shown and others have low-level wires that go into the control system from the thermal switch.
The diagrams were taken from the 02-03 Civic service manual:

http://hondatech.info/downloads/Auto/Manuals/Civic/

The same manual shows the thermal switch associated with the compressor:

Click the image to open in full size.

Click the image to open in full size.
Reply With Quote
  #9  
Old 05-20-2008, 09:37 AM
 
Join Date: May 2008
Posts: 12
Default RE: 2002 Civic A/C trouble shooting

I made the appointment for tomorrow, I will post back tomorrow with the results. I have a feeling it's either the ECM or the multiplex unit itself. Thanks for all of the replies and suggestions!
Matt
Reply With Quote
  #10  
Old 05-20-2008, 10:05 AM
 
Join Date: May 2008
Posts: 12
Default RE: 2002 Civic A/C trouble shooting

One more question just to make sure I jumpered the thermal protector correctly. I hooked the 2 wires together that are not the clutch power wire. When I hook these together, the middle wire gets 12V positive and the clutch engages. Thanks again.
Matt
Reply With Quote
Old 05-20-2008, 10:05 AM
 
 
 
Reply

Tags
02, 2002, 2007, ac, civic, clutch, fuse, heater, honda, light, lx, relay, time, trouble, troubleshooting

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
Honda Civic Performance
Civic Custom Rims
Ground Effects at CARiD
AMSOIL - Performance Oil Technology
K&N Engineering
Advertise Here
All times are GMT -8. The time now is 07:51 AM.

Internet Brands, Inc.
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.


Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for HondaCivicforum.com content, comments, or advertising. HondaCivicforum.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse HondaCivicforum.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.