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2007 XC70 Radiator Fan not running after overheat

Old 05-30-2018, 04:39 PM
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Join Date: May 2018
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Default 2007 XC70 Radiator Fan not running after overheat

I have a 2007 XC70 wagon with 149K miles that overheated in a Wash DC garage last week. After the local shop tried 2 replacement used fan assemblies and neither worked (itís questionable if either was the correct model # which is 30749759), I had it towed the 100 miles back home up here in Lancaster PA where Iíve been troubleshooting it. The battery was also dead (bad cell, coincidental apparently) and has been replaced. I ordered a used fan assembly from LKQ (theyíre great btw) off a 2006 Volvo S60 that had 85K miles so figured that should be ok Ė the part was ďtestedĒ and is under warranty from LKQ. I had first tested the power and control cable from the ECM (car runs fine otherwise by the way) and measured around 14 volts power running and various lower voltages for the purple control wire, varying from 0.5v up to as much as 4v. I let the car run at least 20-25 mins until it reached mid-temp range (did not go beyond that while just idling in the garage - maybe we should let it run longer?) and during that time the fan would not start (it was connected of course but not yet installed, laying on top of the engine.) We cycled the A/C on and off and no fan start either. We did check for cold air -- not the coldest but after shutting all but one damper on the dashboard, cold air definitely coming out w/ A/C on but I didnít want to run that too long to avoid A/C overpressure. The first time I checked the control wire when toggling the A/C, the voltage dropped quickly from about 4v down to about 1v. So all indications seem to point to the fan module again not working which is hard to believe especially since that would be 3 bad used fans on top of my original one that had definitely initially failed, leading to the brief overheating last week. Any suggestions for next steps appreciated, thanks.
Old 05-30-2018, 06:30 PM
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Join Date: Oct 2010
Posts: 5,029

A new fan. Used electrical parts are never a sure thing.
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