Hi,

I have a '95 Volvo 850 Turbo sedan, in which I replaced the ECC with one I found at a junkyard.
The AC will blow air when the car is in ignition I, with the engine off. But when I turn the engine on, the ECC Rec and AC lights will blink, and the fan doesn't turn on.
I think there's low refrigerant, since the AC hasn't blown cold for the last two years.

I'm not very knowledgeable when it comes to Volvos in general. Any advice on what the problem might be? Thanks!

 

The lights blink because there is a code stored in the ECC self diagnostics. Since the fan does not come on the code could be the fan motor is using too much current, so the ECC shuts off the power. Try starting the car with the fan off, then slide it over once the car is started -

To retrieve the code - you use the port under the hood - but I can't remember which # port to plug into to get the ECC codes. (it's been a while) Low refrigerant won't set a code or make the lights flash.

But Luther White remembered back in 2006, Thanks Luther - https://volvoforums.com/forum/volvo-...g-lights-7468/

Even though you might have a OBDII port under the dash it is not fully functional, that did not happen until 1996. You should still have DTC box behind the passenger headlight. I think the only exception to this was R's, someone correct me if I am wrong. Cava, is there any problems noticed with your system? If not, then your codes will probably be something like 414 or 417 which is either driver & passenger side Temp sensor fan seized, pretty common. Easy fix usually, they are located behing the handles above each door, remove blow out, reinstall... Should be good to go!! Pull codes and report back if thats not what you pull(414 or 417). Here is a list of DTC codes.

ENTERING SELF-DIAGNOSTICS
1) Connect selector cable from diagnostic unit "A" to
terminal No. 1 of diagnostic unit "B", located behind right headlight.
2) Turn ignition on. LED on diagnostic unit "A" should start
flashing. Each DTC (3-digits) consists of a series of flashes with a
short break between each series. DTCs are displayed in ascending
order. See AUTOMATIC A/C-HEATER SYSTEM DIAGNOSTIC TROUBLE CODES table.
Courtesy of Volvo Cars of North America.
AUTOMATIC A/C-HEATER SYSTEM DIAGNOSTIC TROUBLE CODES
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Code # Condition/Affected Circuit
1-1-1 ..................... No Fault Found By Diagnostic System
1-2-1 .......... Outside Temp. Sensor Circuit Shorted To Ground
1-2-2 .................................... Outside Temp. Sensor
Circuit Open Or Shorted To Power
1-2-3 .... Driver’s Side Temp. Sensor Circuit Shorted To Ground
1-2-4 .............................. Driver’s Side Temp. Sensor
Circuit Open Or Shorted To Power
1-2-5 ....... Pass. Side Temp. Sensor Circuit Shorted To Ground
1-2-6 ................................. Pass. Side Temp. Sensor
Circuit Open Or Shorted To Power
1-3-1 ....... Driver’s Side Duct Temp. Sensor Shorted To Ground
1-3-2 ......................... Driver’s Side Duct Temp. Sensor
Circuit Open Or Shorted To Power
1-3-3 .......... Pass. Side Duct Temp. Sensor Shorted To Ground
1-3-4 ............................ Pass. Side Duct Temp. Sensor
Circuit Open Or Shorted To Power
1-3-5 ........................ No Engine Temp. Frequency Signal
1-4-1 ........ Driver’s Side Temp. Switch Faulty Control Signal
1-4-3 ........... Pass. Side Temp. Switch Faulty Control Signal
1-4-5 ........... Air Distribution Switch Faulty Control Signal
1-5-1 ..... Fan Speed Sensor Control Signal Missing Or Too High
1-5-2 ....... Fan Speed Sensor Control Signal Shorted to Ground
2-1-1 .............. Driver’s Side Damper Motor Position Sensor
Circuit Open Or Shorted To Power
2-1-2 .............. Driver’s Side Damper Motor Position Sensor
Shorted To Ground
2-2-1 ................. Pass. Side Damper Motor Position Sensor
Circuit Open Or Shorted To Power
2-2-2 ................. Pass. Side Damper Motor Position Sensor
Shorted To Ground
2-3-1 ................ Ventilation Damper Motor Position Sensor
Circuit Open Or Shorted To Power
2-3-2 ................ Ventilation Damper Motor Position Sensor
Shorted To Ground
2-3-3 .............. Floor/Defrost Damper Motor Position Sensor
Circuit Open Or Short To Power
2-3-4 .............. Floor/Defrost Damper Motor Position Sensor
Shorted To Ground
2-3-5 .............. Recirculation Damper Motor Position Sensor
Circuit Open Or Short To Power
2-3-6 ..................... Recirculation Damper Motor Position
Sensor Shorted To Ground
3-1-1 ... Driver’s Side Damper Motor Shorted To Ground Or Power
3-1-2 ...... Pass. Side Damper Motor Shorted To Ground Or Power
3-1-3 ..... Ventilation Damper Motor Shorted To Ground Or Power
3-1-4 ... Floor/Defrost Damper Motor Shorted To Ground Or Power
3-1-5 ... Recirculation Damper Motor Shorted To Ground Or Power
3-2-1 .............. Driver’s Side Damper Motor Active Too Long
3-2-2 ................. Pass. Side Damper Motor Active Too Long
3-2-3 ................ Ventilation Damper Motor Active Too Long
3-2-4 .............. Floor/Defrost Damper Motor Active Too Long
3-2-5 .............. Recirculation Damper Motor Active Too Long
4-1-1 ......... Pass. Compartment Fan Overcurrent Or Seized Fan
4-1-2 .............................. Driver’s Side Temp. Sensor
Intake Fan Shorted To Ground
4-1-3 .............................. Driver’s Side Temp. Sensor
Intake Fan, No Control Voltage
4-1-4 ............ Driver’s Side Temp. Sensor Intake Fan Seized
4-1-5 .... Pass. Side Temp. Sensor Intake Fan Shorted To Ground
4-1-6 .. Pass. Side Temp. Sensor Intake Fan, No Control Voltage
4-1-7 ............... Pass. Side Temp. Sensor Intake Fan Seized
4-1-8 .................... No Control Signal To ECC Power Stage
4-1-9 ....... ECC Power Stage Emitting Faulty Diagnostic Signal
4-2-0 ................ ECC Control Module Fault, Program Memory
5-1-1 ......................... Self-Adjustment Of Damper Motor
Limit Positions Not Carried Out

 

Thank you hoonk! I was able to read the code from the DTC box. It was port #1 on B according to the post you quoted from Luther.

I read 4-1-1 ( Pass. Compartment Fan Overcurrent Or Seized Fan)
and 4-1-4 (Driver’s Side Temp. Sensor Intake Fan Seized).

I've seen some videos on youtube about cleaning the intake fan. Do you or anyone have experience dealing with a 4-1-1?

Thanks!

 

Yes, you replace the fan motor

 

as a good resource for your 95, check out volvotips.com

 

Okay, I took apart the glovebox and knee bolster. Just need to wait for the part to arrive.

I do wonder why it works when the engine is off though.

Thank you for this!