'99 XC-70 Intermittent A/C Problem - Volvo Forums - Volvo Enthusiasts Forum

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Old 12-13-2014, 03:31 PM
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Default '99 XC-70 Intermittent A/C Problem

Can anyone help? I have a mysterious intermittent problem with the ECC in my 99 XC-70. Sometimes it works perfectly, and sometimes the blower comes on for a few seconds, and then shuts off and I get two flashing red lights. The problem does not seem to have any relationship to ambient air temperature. If it is working, it seems more likely to work the next time after shutting the car down if I leave the a/c turned on before switching the ignition off. But not always. Since it works perfectly sometimes, I cannot see that there can be anything wrong with the compressor, etc. Could it be something in the ECC in-dash control unit? There seem to be a number available on eBay for reasonable prices. Would you suggest that I just replace the ECC in-dash control unit and see what happens?
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Old 04-14-2015, 05:53 PM
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 3,073

could be the blower resistor - they are more likely to go than the ECC. Any noises from the blower when it does work (ie it could have a bad bearing and the computer is shutting down when it draws too much power). Can you get it to say on when going to manual mode with the lowest fan setting vs automatic?
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