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Heater fan slows when applying brakes - 2007 Suzuki Grand Vitara 4WD

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Changed battery and now issues

You should get the alternator output checked. It sounds as if the alternator is not putting out enough juice to supply the running lights, brake lights and fan together. Voltage across the battery terminals with the engine running should be around 14.5 volts.

Feb 13, 2014 | Pontiac Vibe Cars & Trucks

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Why does the battery light come on when you apply the brakes

great question. (running engine , no less)
1: that means the lamps in the brakes (3amps?) is overloading
a 50amp Alternator. (impossible nearly) but ???
wiring errors.
loose battery connections
shorted brake lamps or wires to same.
id the wrong size fuse in the brake fuse box.? if yes, you risk fire.

did you try all other accessories, on car, to see if too, overloads
the alternator (loose belt?O)
1: head lights.
2: cab heater fan on max
3: defrost heater in rear of car window.
4: all at onces?

if ONLY brakes? DO IT?, then remove all brake lamps. now.
and re test. brakes. no lamps.

all answers for a stock car, if car is hacked, all my answers are useless. (hacking is infinite) (alarm hacks, remote start hacks, cruise hacks. are common and a PITA)

Oct 26, 2013 | 1987 Honda Accord

1 Answer

When applying the brakes i have a clicking noise, my headlights flicker and my heater slows down blowing

Is it icy or snowy where you live? Sounds like anti-lock brakes kicking in... Can you freel it in your foot?

Jan 20, 2011 | Chevrolet Lumina Cars & Trucks

1 Answer


I would check the brake caliper hinge pins. If the pins are worn, every time you apply the brakes the caliper moves forward against the pins. If the caliper pins and or caliper are worn they will clunk when the brakes are applied.
Check to see if the caliper shifts forward and back.
Let me know.

Apr 09, 2009 | 2000 Chrysler Cirrus

1 Answer

Heater Temperature fluctuates

Coolant level is low!!!

Jan 23, 2009 | 2003 Toyota Camry

1 Answer

Fluxuation in electrical power

This is normal behavior in Grand Ams. I've had a '97 and a '04 and both did this from day 1. You'll also notice the lights dim/blower slow down more if you press the brake pedal while idling w/ blower on high and lights on; it's just that the alternator on these cars can't output anywhere near full power at idle. (my '03 S-10 also does this). Watch your voltmeter if you have one, when running above 1200 RPM you should see the system running between 13.5 - 14.5 (usually you just have to eyeball this as the gauges aren't well marked, mine are only marked 8 & 18 - should read slightly past halfway). If you're still worried, have someone check the system for you, many places like Autozone or Advanced will do this for free.

Jan 14, 2009 | 2004 Pontiac Grand Am

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