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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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A/C control panel flickering, heater starts only after ~5minViews : 502 Replies : 3Users Viewing This Thread : |
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Oct 22nd, 2018, 13:47 | #1 |
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Last Online: Jan 28th, 2019 18:47
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Location: AG
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A/C control panel flickering, heater starts only after ~5min
My heater doesn't work when cold (this night, it was freezing).
The first time, nothing lights up. After some time, the LEDs on the A/C- and circulating air buttons flicker. After a couple of minutes (~4-5 km drive), the blower, air condition and rear window heating work without any problem. I have Vol FCR and Brick diag but some times, they struggle to read out the errors and cannot identify the module. Is there any other (free) diag software recommended? What I already found some times (does not show up every time, probably transient errors): ECC-212 Temperature Motor Position sensor, SC to to battery ECC-222 Air distribution motor position sensor, SC to battery ECC-322 Air distribution motor, OC or active too long ECC-412 Blower fan motor, SC to ground in signal cable In the ECU (not the A/C-control unit) is some times the ECC-342 air conditioning (A/C) relay signal faulty Has anybody here the secret hint? If warm, everything works great indeed! Is that A/C relay probably located in the engine compartment and warms up after cold start? It's a 1998 S40 T4. Last edited by S40 Phil; Oct 22nd, 2018 at 13:50. |
Oct 22nd, 2018, 18:59 | #2 |
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Last Online: Nov 15th, 2022 21:34
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Location: London / Essex
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My brothers 2004 V40 had a similar problem a few years ago. When starting the car, the heater control panel would not work at all. No lights, no LED, no controls, nothing. After a couple of minutes driving, the heater control panel would come alive and work perfectly fine. In this case, it was a relay under the driver's footwell that was faulty. Replaced and problem was gone for good
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Current car: 2002 S40 1.9D, 1992 240SE Nullius in Verba
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Oct 22nd, 2018, 22:00 | #3 |
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Last Online: Jan 28th, 2019 18:47
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Thanks for your information.
I guess your brother had a RHD Volvo? Mine is LHD, so it should be that device? https://www.youtube.com/watch?v=U2_67xPkyW0 Or is there a true relay next to the fusebox? One of those in 11B? 2005-volvo-s40-engine-diagram-2000-volvo-s40-fuse-box-free-download-wiring-diagrams-schematics[2.jpg I checked the A/C-relay in the engine compartment but there seems to be everything OK. Last edited by S40 Phil; Oct 22nd, 2018 at 22:03. |
Nov 7th, 2018, 21:32 | #4 |
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Last Online: Jan 28th, 2019 18:47
Join Date: Oct 2018
Location: AG
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Some days ago, I replaced the left upper relay above the fuses (picture 11/B). Quite hard to get there.
I just installed a universal relay (normally open) and until now, it works great. Are there specific requirements (e.g. integrated surge diode) for the relay? I only measured the current the coil consumes. The factory installed one read 0.15 A and my "new" (in fact it's about 30 years old...) one 0.14 A. |
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