my heater fan goes on randomly everybody thinks it's an ignition switch

Asked by Nov 18, 2013 at 07:09 PM about the 1999 Volvo S70 Turbo AWD

Question type: Maintenance & Repair

my volvo guy ordered an ignition switch and its a dual air system, when I turn the switch
on and off it goes off. I read on some of your answers you may think it a fan going bad or
some kind of module. at the volvo shop they quoted about $170 for the module. What do
you think?

3 Answers

ok....my computer keeps pointin' to an ECM relay~ http://www.1aauto.com/1A/electrical-auto- parts/Volvo/V70/1AZMX00174/652918-1999? utm_campaign=gb_csv_br&utm_content=ZMX&gclid=COKfkpzJ77oCFatAM godO0sAXw

1 of 1 people found this helpful.

...personally one must look at the age of the battery...and the condition of the main connection to the ground....disassemble the lug (1/0) cable off the battery....wirebrush it clean and the territory that it bolts to....with a solid ground...(as dis-similar metals form a "semi-conductor" layer of corrosion there) and a NEW battery, you problems WILL go away~

70,225

My friend at work has a '93 Cadillac Eldorado that does the same thing. Has been for years. Nobody, including the Cadillac Dealer can figure it out. I kinda remember reading somewhere that certain years and models of BMW will do this as part of the ventilation system. Maybe it's normal? -Jim

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