LostSoul Posted January 6, 2017 Report Share Posted January 6, 2017 My heater/ac works when it wants to. It gets cold or hot based on the setting but the fan comes and goes as it wants. I have replaced the resistor pack and tested the fan for operation with power directly applied. It works well. When I connect it to the environmental control it only works after you've driven for a while. When you stop it will quit and you have to drive for 15 to 30 minutes before it works again. My controller has the temp on it rather than the red and blue temp control. I have removed it and looked for dirt or obvious problems. Does anyone have any ideas where I should look or techniques to use to troubleshoot the circuit? Mark & Jackie Visalia, CA USAF Ret 2011 Smart convertible 2014 Trilogy 3650 RE 2004 Volvo VNL780 Cummins ISX 530 13 speed Link to comment Share on other sites More sharing options...
jeffw Posted January 6, 2017 Report Share Posted January 6, 2017 Check out http://otrperformance.com/project/volvo-truck-blower-motor-resistor/ I had an intermittent fan in the 3rd speed that was cured by replacing the control panel. Here's how you do it: 2007 Volvo 780 Volvo D12D, 465hp, 1650 ft/lbs tq., ultrashift Link to comment Share on other sites More sharing options...
Nigel Posted January 6, 2017 Report Share Posted January 6, 2017 RandyA fixed his a couple of years ago. If you look on the heavy haulers resource guide under projects then fixing dash vents and hvac controls you will find his write up. Nigel 2006 Volvo VNL 430, 2006 smart cabrio cdi, 2000 Triple E Topaz 30' Link to comment Share on other sites More sharing options...
jkoenig24 Posted January 6, 2017 Report Share Posted January 6, 2017 Great link, Jeff! Link to comment Share on other sites More sharing options...
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