Tip & How-To about Suzuki Grand Vitara

Suzuki Grand Vitare 2.0l. How to check why heater fan is not running

If the heater fan is not running;
1. Check the fuse first of all.

2. Check if the fan is running when connecting 12VDc directly to the fan.
If not running . Replace Fan.

3. If Fan OK - check the voltage on the connector from the fan between red and Black wire. Must be 12V

If no 12V - Supply voltage is missing - probably fuse defect.

4.If 12V = OK - measure the voltage on the Violet wire in the connector.
When button on dashboard is set to "Fan active" You must measure a voltage here close to 10VDc. If OK Fan Resistor/Regulator defective.
5 If no voltage (10V) on the wire (violet) when set to "Fan active" controlboard behind the dashboard defective.

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2 Answers

My fan does not work on any of the four speed settings, i checked fuses and they are good, what else could be causing this problem?


The fan itself may have failed. Try this though which worked for me one freezing winter night. Locate the blower under the hood. Hit the rounded end of it with a block of wood. The motor has carbon brushes which can stick and loose contact with the commutator that the brushes run on. Hitting it will dislodge them and put them back in contact.

There is sometimes a capacitor on the motor and this can also fail.

Nov 08, 2015 | 2002 Isuzu Rodeo

2 Answers

How do I find the fuse for the heater blower


IF the heater fan is not working it is most likely the heater fan motor that has failed.

Oct 08, 2015 | 2001 Suzuki Grand Vitara

1 Answer

blower motor does not work replaced the blower motor, resister, fan switch and relay still does not work


blower , heater dead.?
use a voltmeter, and find out what is wrong, in minutes.
first check voltage to the blower,
on fan high.
got voltage there. then the blower is bad.
no voltage there, then its not the blower bad. its controls or power feed.
my guess is you dont know that fuses that look good can in fact be bad.?>
old post. but here goes.
of lost, use a schematic, they tell you how the circuit works.
click here
on TJ
then heater........
FSM
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

shows 7 things can be wrong. (omg what to do, use a meter)

now click A/C heater page.
same FSM.
got 12vdc to both JB fuse 8 and PDC fuse , keyon,
both sides of fuse must be 12vdc or the fuse is BAD.
got 12vdc to blower relay pin 1, (bad relay if not, or?)
if you have 12vdc on pin1 then then check voltage at
blower B wire,
if wires is at 12vdc that means the blower switch is bad.
if the wire to the switch C3 pin C is 12vdc that means the ground to the heater control is open. correct that
if the pin C3pin C is 0v, that is good, if switch is on high
and the C1 pin A is 12v, that means the switch is bad, or wires to it cut
or the connectors to IT are corroded.

just a $10 walfart DMM meter, and bam , why is know.
no guessing or pulling out hair.
as you can see the dash heater switch grounds the blower.
if it can not ground the motor, the motor will be dead.
that is how it works.

Feb 22, 2014 | 2000 Jeep Wrangler

1 Answer

My blower motor wont blow


bad fuse,
it can only be 3 things, a voltmeter finds this easy and every time.
bad fuse, bad switch bad, motor.
as we all know that includes all wires and connections, fore ever.
so you can check the blower , 12vdc on high.
if 12v there, and motor is silent the motor is bad or lost its ground.
to check that 100% apply 12vdc to the motor, bingo it works?
so no 12v to motor, must be bad switch, huh? after all the fuses is already checked(with ohm meter not eyes !)
so now i have 12v to the switch and no 12v out. must be a bad switch
easy huh?
ill now look yours up to see if there are other oddities.
alldata.com
ahh , up to 4 blowers, 2 front and 2 rear. fun but the 2 front are in parallel. and bingo, all 4 have there own FUSES !@!!!
forget that its rear and a/c only , what a complex car. no biggy
electrics is my game
i go to page 3 for HVAC, allh the heater, omg 2 relays 1 fan
the switch does NOT power the fan.
the switch only energizes relay 1, the ground relay
this heater relay pulls in and grounds the FAN.
ok 1/2 done.
next relay is Power side blower relay.
it gets 12vdc power from its very own 40Amp, Circuit breaker
the switch also ground this relay, it too energizes and bam
12vdc hits the fan
id bet the fan is good, and shock, no need to pull dash to get it out...
all that , in 5min flat , alldata.com
try it.

ask questions.

Jan 24, 2014 | 1995 Toyota Previa

2 Answers

my heat has stop blowing. replaced blower, and heater on off switch. what else could it be?


LX? DX? EX? Hatchback? sedan? wagon?coupe? engine size? did you check the fuse? Fuse #19, 30 amps in the auxilary fuse box (your owners manual may show the location ,it may be near the blower ?). The Blue/White wire at the heater blower motor should be HOT (12v) with key on. If you ground the Blue/Black wire the motor should run full speed.

Dec 17, 2010 | 1991 Honda Civic

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