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  #1  
Old 09-23-2009, 04:28 PM
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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!
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Old 09-23-2009, 04:41 PM
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That must have been a nightmare. Greatly appreciate your sharing valuable info with us.


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  #3  
Old 09-24-2009, 01:10 PM
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WOW, that was some banged up job. Happy to see that everything is fixed.
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Old 09-25-2009, 12:22 AM
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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?
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Old 09-25-2009, 01:48 AM
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no. your 93 does not an an ecc. it has the manual control (mcc). it sounds as if you have a bad blower motor.
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Old 09-25-2009, 12:50 PM
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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.
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Old 09-26-2009, 06:20 AM
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1994 Volvo 850
 
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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.
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Old 09-26-2009, 06:20 AM
 
 
 
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Tags
1994, 760, 850, circuit, climat, climate, control, ecc, electronic, heater, location, manual, open, panel, volvo


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