1994 850 T 2.3L Electronic Climate Control ECC - Volvo Forums - Volvo Enthusiasts Forum


Volvo 850 Made from 1993 to 1997, this Volvo line was available in both a wagon and a sedan, both with were graced with several trim levels.

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 09-23-2009, 04:28 PM
Junior Member
Thread Starter
 
Join Date: Aug 2009
Posts: 22
Default 1994 850 T 2.3L Electronic Climate Control ECC

1994 850 T 2.3L Electronic Climate Control ECC


Symptoms were flashing Rec and AC lights for about 2 minutes not just the 20 second kind. All dampers stuck open and most A3 code failures. Fan worked on sliding scale but directional selector has no effect.


I bought a used ECC module on eBay for $59USD. Based on all my internet readings all symptoms pointed to a bad ECC module including the Volvo dealership diagnostics which cost $150USD. I disconnected the battery and replaced the ECC module but fuse 31 blew and SRS module circuit board melted along pins A 5, 6, 8, 9, 10 just like my original ECC module. I twice re-soldered the original board with the same results, that's why I purchased the eBay module. Well it turned out I had multiple fused wires under/behind the passengers side SRS black metal knee plate. I traced and replaced about 20-25 bad wires and 2 connectors. I completely rewired the AC switch connector. Fabricated connectors from $18USD Radio Shack wires and connectors. Securred everything with zip ties and electrical tape. Apparently Volvo repairmen left the wires dangling when they did numerous repairs over the years. (I'm the original owner and stopped using Volvo for any repairs about 3 years ago.)

I hope this helps someone else!
Reply With Quote
  #2  
Old 09-23-2009, 04:41 PM
JPN's Avatar
JPN JPN is offline
Senior Member
 
Join Date: Sep 2006
Location: IPS, MA
Posts: 5,387
Default

That must have been a nightmare. Greatly appreciate your sharing valuable info with us.


JPN
Reply With Quote
  #3  
Old 09-24-2009, 01:10 PM
Former Sponsor
 
Join Date: Jul 2008
Posts: 1,710
Default

WOW, that was some banged up job. Happy to see that everything is fixed.
Reply With Quote
  #4  
Old 09-25-2009, 12:22 AM
Junior Member
 
Join Date: Sep 2009
Posts: 6
Default

I have similar issues on my 93 850 n/t. Fan does not always work and selector switch stuck on i think auto. Am I looking at a new ECC module?
Reply With Quote
  #5  
Old 09-25-2009, 01:48 AM
850tony's Avatar
Senior Member
 
Join Date: May 2009
Location: wisconsin
Posts: 787
Default

no. your 93 does not an an ecc. it has the manual control (mcc). it sounds as if you have a bad blower motor.
Reply With Quote
  #6  
Old 09-25-2009, 12:50 PM
Junior Member
 
Join Date: Sep 2009
Posts: 6
Default

Looking online I can't tell the diff between ECC and MCC. What's the diff? If the blower motor was going out, would it only come on half the time or would it just blow slower? It does both btw?
Edit- nevermind I got it, noobie moment

Last edited by akshizo79; 09-25-2009 at 01:11 PM.
Reply With Quote
  #7  
Old 09-26-2009, 06:20 AM
Junior Member
Thread Starter
 
Join Date: Aug 2009
Posts: 22
Default

Quote:
Originally Posted by akshizo79 View Post
Looking online I can't tell the diff between ECC and MCC. What's the diff? If the blower motor was going out, would it only come on half the time or would it just blow slower? It does both btw?
Edit- nevermind I got it, noobie moment

Check to see if you have a cabin filter under the hood under the right passenger side windshield wiper. Recommend you check all your wiring near and around the fan, a/c switch, MCC, ect., all behind the glove box. Could be loose wire or short.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
93 Volvo 850 with ECC (climate control) issues and reading the codes yody Volvo 850 5 07-09-2015 12:03 AM
1994 850 turbo electronic climate control compatible part numbers suomi1 Volvo 850 4 12-22-2013 12:22 AM
Electronic Control Center(ECC) went out!!! cbrownwsp1 Volvo XC70 0 09-21-2011 03:59 PM
Electronic Climate Control ECC 2000 V70 johnnapier Volvo V70 0 09-01-2011 11:11 AM
1985 760T electronic climate control unit' ECC' SS760TI Volvo 260, 760 & 960 1 03-26-2007 07:26 PM


Tags
1994, 760, 850, circuit, climat, climate, control, ecc, electronic, heater, location, manual, open, panel, volvo

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 10:56 AM.