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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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AC Control unit, 960.Views : 789 Replies : 12Users Viewing This Thread : |
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Feb 20th, 2021, 16:14 | #1 |
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Last Online: Apr 12th, 2024 13:08
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Location: Hounslow West London
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AC Control unit, 960.
Hi all, looking for some help.
My car is a 1993 960, 2.9 auto with Air con, R134 gas, ECC unit. The gas system is fully charged but I can hear a relay clicking from the A/C unit. It is the A/C control unit (Volvo part 1365678) and it is located on the heat exchanger housing by 2 screws. To get access, remove the glove compartment and the passenger footwell panel and its tucked away in there....but just accessible to remove it. I know that's the cause of my problem as I can hear and feel the unit clicking, which in turn has an effect on the a/c cooling and the lovely slow running of a 6 cylinder engine. I understand the part number is 1365678 and is listed as no longer available. Anyone have a used part tucked away or can send me to a possible source....or a repair? I have had the unit out and cleaned up the 2 contacts inside but I suspect there is something else bad inside as it if still faulty. |
Feb 21st, 2021, 18:36 | #2 | |
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Feb 21st, 2021, 19:42 | #3 |
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Last Online: Apr 12th, 2024 13:08
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Thanks for coming back Dave. I usually run the engine with the AC always on and the ECC controlling the temperature, usually set at 18c to 20c, and it works fine. You can feel the filter/accumulator (next to the engine bulkhead on the passenger side) and its cold and you can have the air coming into the car at whatever you set it at. However, after running for just a few minutes, you can hear a relay clicking i.e. switching in and out, and it starts to have an effect on the tickover, making it unstable. (It doesn't switch the AC pump clutch in and out, but the clutch does operate in its normal fashion responding to gas pressure.) But the clicking of the relay in the AC control unit does feed into the engine management system to affect the engine running. If I switch the AC off at the ECC dashboard controls, then the pump AC system goes off, no relay clicking, and the engine runs normally as you would expect. I've had the control unit out with the cover off and observed the relay clicking and out. The control unit is reported as no longer available so any help is welcome. I have used some crocus paper on the two relay contacts but that is not the fault; its somewhere in the card and associated electronic units. The card soldering looks good. Any suggestions Dave or "used but good" units?
Thanks, Garth. |
Feb 21st, 2021, 20:15 | #4 | |
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At this time of year, holding it to 18-20C (18 is also minimum which will force the compressor permanently on) even when just warming up is going to be tricky. Might be worth blowing or vacuuming the interior light in the middle of the roof as that's where the cabin temp sensor is for the ECC. Also try cleaning out the AICV to help maintain a steady idle when the compressor kicks in.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Feb 22nd, 2021, 06:48 | #5 |
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Last Online: Apr 12th, 2024 13:08
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Location: Hounslow West London
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Noted Dave and thank you. I had forgotten about the cabin sensor; I'll do that and the AICV.
Get back to you later. |
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Feb 22nd, 2021, 10:49 | #6 | |
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https://www.volvoclub.org.uk/faq/Hea...iagnosticCodes Probably won't show anything but worth a try.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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