Question about 1998 Chevrolet C3500

2 Answers

My heater motor won't turn on when I hit the fan switch. The fuse is good. I hear a relay click when I turn it to the high position, but the fan motor won't turn on.

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2 Answers

I took the heater motor out, spun the fan a few times, and it started to work. It had been sitting for quite a period of time and I guess it got stuck in that spot. It's fine now and I don't have to replace the unit.

Posted on Aug 09, 2008

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Replace it

Posted on Aug 09, 2008

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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

5 Answers

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Check connectors and wiring, probably vibrations are interrupring some bad connector.

Aug 14, 2008 | 1995 Volvo 850

1 Answer

Blower motor relay make clicking sound when i turn the heater on. Changed relay and still does the same thing


Sounds like your blower motor may have either ceased, or gotten an obstruction. Sometimes an animal will crawl into your heating unit and make a nest or other things get in there and bind up the hamster wheel (fan). Start by checking for power at the fan using a test light with a wire probe end. If you have power at the fan with the switch on but it's not spinning, first check for an obstruction, if no obstruction, check to make sure the ground is good from the motor (make your own ground with the test light by probing the ground) if the motor spins up, fix the ground wire, if not, time for a new blower motor unfortunately.

Nov 13, 2013 | 2005 Chevrolet Aveo

1 Answer

Installed new blower motor. bearing shelled in old one. new motor won't blow. tested . it's good don't have power to moter. fuses good relay good. isthere a circuit breaker in wiring for b


I don't have a diagram for a 2008. On 2005 models the blower motor relay gets power from a 30amp fuse.
When the blower switch is in the high position the resistor is bypassed and power flows directly to the motor. The motor is grounded to the car.
The fan relay also gets power from a 7.5amp fuse and is controlled by the HVAC control on the dash.
Do you have power into and out of the relay?

Feb 25, 2013 | 2008 Mitsubishi Lancer

1 Answer

Heater fan stop working


Should have a fuse for it; look for 25 or 30 amp heater fuse. If it's good, pull off the connector at blower motor, and with key on and heater fan switch on high setting, check for power at the connector. If you have power there, then the motor nust be bad and need replacing. If no power at the motor, the switch may be bad, or the wiring or the heater relay needs to be investigated.
Good luck.

Feb 02, 2012 | Cars & Trucks

2 Answers

No air coming out of the vents


It sounds like the heater motor may not be operating. When you switch the heater fan on can you hear the motor running? If not then it may have blown the heater fan fuse, check the fuse's and then try it again. If the fuse is ok then it could be a faulty switch or fan motor.

Apr 02, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

Replacing heater blower motor


this is not a problem with thw switch or motor. There is a resistor that is mounted inside the dash on the pasenger side that controls the speed of the blwer..these have a tendency to burn up after 10 years or so... replace the resistor, and you will be fine!  http://cgi.ebay.com/ebaymotors/Toyota-Truck-A-C-Heater-Fan-Resistor_W0QQcmdZViewItemQQcategoryZ33548QQihZ016QQitemZ260344846266QQrdZ1QQsspagenameZWDVW#ht_500wt_1230

Dec 23, 2008 | 1984 Toyota Pickup Deluxe

2 Answers

Blower motor


the fuse should be located in the fuse panel under the dash on the drivers side. the relay will be located in the junction box under the hood. if you have a owners manual it will show which fuse is what and amprage. if these are good it could be a bad switch, however if you turned it on and heard a click i would say that your relay is bad. please rate this

Sep 03, 2008 | 1991 Eagle Talon

2 Answers

Heater relay


First, turn on the fan motor to high, and then tap the bottom of the motor. The brushes stick to the armature, and tapping the motor will release them. Second, check for voltage at the connector for the motor. It should be 3 VDC at position 1, 6 VDC at position 2, 9 VDC at position 3, and 12 VDC at the highest position. No voltage at 1/2 & 3 = replace the heater resistor, located in the air box between the fan & the heater core. No voltage at all? Replace the fan switch.

Jun 07, 2008 | 1995 Toyota Pickup

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