Blinking lights on Electronic Climate buttons - found 'fluff' inside cabin temperature sensor which I removed. Small fan turns a few degrees when car started but won't continue to rotate. Removed from car as per Haynes manual (without having to rotate it - Haynes manual is wrong there). Checked visually and can't see anything which may prevent the fan from rotating. Removed rear plastic base from the sensor to reveal surface mount chips etc. My Haynes manual doesn't even show this sensor on the wiring diagram for the Climate control. There are 4 pins on the unit. Question - does anybody have any information on the pin assignments? Or has anyone else tried to fix the sensor? New sensor is US$75. Bit reluctant to spend that sort of money in case the problem is not the sensor but the ECC module itself. Have ordered an OBD interface which has not yet turned up so I don't have any codes to help in the diagnoses yet.

Thanks in advance for any help/suggestions,

Cheers, Phil
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'98 N/A S70 145,200Klm

Phil, I do not think that your OBD tool will read ECC codes. Those are proprietatry Volvo codes and only Volvo Scan Tool can read and reset them. There can be more than one code set as well. In addition to your fan not spinning you may have a faulty sensor. It is unfortunate, but Volvo has closed the doors on the tree-shade mechanics and has done so more agressively every year since MY98. In MY2001, for example, you can't even change or add stereo components without Volvo say-so (and $$ pay-so). Sorry to hear about your problem. I've been having these issues off and on for a long time. I have extended warranty and take it in using that. Every time I get a different thing: temp sensor, actuator motor, etc. So, I keep paying the $50 deductable. When the warranty runs out, I am not sure what I wil do...


Cheers!
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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers,

ok my ecc blinked for about a year or two. i finally got it diagnosed it was the cabin temp sensor. i asked if this was something i could do my self because i can get parts cheaper than where i get my car serviced. they said sure but only they (dealer) can reset your computer/ecc so it will reconize the new sensor. they gave me some line about once it faults just replacing it won't solve the problem. so i let them fix it since i have to drive two hours to get to a dealership. fyi the richardson, tx dealership rocks for scheduled maint.
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'88 745T, '89 780T, '98 S70T5

The dealer is incorrect there is no need to match a new sensor.

You can ususally get away with cleaning the fluff out and using some light oil on the fan bearing.
Note the fan is spun once on startup for daignostics and will then only run when the main fan does, so to test it you need to switch the main fan to a setting other than auto or 0.