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960 heater not working

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

Finnvolvo
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Year and Model: 97 960
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Finnvolvo

960 heater not working

Post by Finnvolvo » Thu Feb 21, 2019 8:33 pm

I have a 97 960, and it has the blinking light from the ac. All the controls work fine, but no heat.

The lines to and from the heater core are hot. But no heat... can anyone help?

I don’t really want to run the codes at the dealership for $100 before trying to fix it myself.



Finnvolvo
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Finnvolvo

Re: 960 heater not working

Post by Finnvolvo » Thu Feb 21, 2019 8:38 pm

Need to fix this! My wife’s car, and she’s freezing!!!



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RickHaleParker
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Re: 960 heater not working

Post by RickHaleParker » Thu Feb 21, 2019 9:42 pm

The blinking light means the EEC has detected a fault.

SELF-DIAGNOSTIC SYSTEM

The EEC system incorporates a self-diagnostic function that indicates system faults through a series of trouble codes. The presence of fault(s) is indicated by flashing A/C OFF button. The control panel is programmed to enter a pre-programmed mode when a fault is detected. Under fault condition, control panel ignores the faulty signal, selects an alternative pre-programmed value and prevents delivery of faulty output signals.


To enter Self-Diagnostics mode:
  • 1. Ensure engine is running.
    2. Shine a non-fluorescent, bright light on solar sensor (LED on the dash).
    3. Place blower fan control knob in AUT position
    4. Function selector knob in vent position.
    5. Place temperature control knob to maximum cooling (pointing straight down).
    6. Ensure recirculated air switch is depressed.
    7. A/C OFF button is released.
Self-Diagnostics mode is enabled.

8. Request a code:
  • Depress and release A/C OFF button within 5 seconds to start self-diagnostic mode.
Each fault code consists of 3 digits. For example, Code 132 is displayed by a single flash of the A/C OFF button for the first digit (number 1). After a pause, the second digit of code (number 3) is indicated by 3 flashes. After another pause, the third digit of code (number 2) is indicated by 2 flashes. See TROUBLE CODE IDENTIFICATION table.

Three different fault codes may be stored in memory. However, only one code may be displayed upon request. It may be necessary to request display of fault codes a number of times to ensure all fault codes are displayed (Step 8 above).

Exiting Self-Diagnostics & Clearing Codes

To exit self-diagnostics, turn ignition off. All codes are cleared when ignition is turned off. Fault codes are not stored in memory. Even if a code has occurred several times during a period of time, code will only be stored until ignition is turned off.

TROUBLE CODE IDENTIFICATION TABLE

Affected Circuit/Sensor Code
  • 111 = Fault Free System
Outside Temperature Sensor
  • 121 = Short Circuit To Ground
    122 = Open Circuit Or Short Circuit To 12 Volts
In-Vehicle Temperature Sensor
  • 131 = Short Circuit To Ground
    132 = Open Circuit Or Short Circuit To 12 Volts
Water (Coolant) Temperature Sensor
  • 141 = Short Circuit To Ground
    142 = Open Circuit Or Short Circuit To 12 Volts
151 = Alternator (D+ Signal Fault)

161 = Solar Sensor

Servomotor/Potentiometer
  • 211 = Open Circuit Or Short Circuit To Ground
    212 = Short Circuit To 12 Volts
Servomotor
  • 213 = Incorrect 12-Volt Supply To Pins No. 17 & 18
    214 = Fails To Operate Within 10 Seconds
ECC Control Panel
  • 231=Faulty Temperature Control
    233 = Fan Motor Excessive Starting Current
Power Unit – Incorrect 12-Volt Supply Affected Output:
  • 241 = Coolant Valve
    242 = Bi-Level
    243 = Vent
    244 = Recirculated Air
    245 = Defrost
    246 = Floor
    247 = Fan (Maximum Speed Relay)
    248 = A/C Compressor
    249 = Radiator Fan Relay


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

Finnvolvo
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Finnvolvo

Re: 960 heater not working

Post by Finnvolvo » Thu Feb 21, 2019 10:26 pm

Thanks for replying, I wasn’t asking for the code info, but more if anyone has had the same issue as do, and how they dealt with it. Thanks



lummert
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Re: 960 heater not working

Post by lummert » Sun Feb 24, 2019 4:27 pm

Is the blower motor not running? If not, the blower motor isn't necessarily the problem. The code about the blower motor starting voltage is related to the ECC power stage. More than likely the ECC Power Stage has gone bad. I installed a ballast resistor and switch to power the blower motor on my 1988 760 with ECC. Without the ballast resistor the fan ran at full speed.


1988 Volvo 760 Turbo Wagon

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