Question about 2003 Chevrolet Avalanche

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2003 Chevy Avalanche fan blower only works on high

The other speeds 1 through 4 just quick working. A/C heater blower now only works on high mode

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Needs blower control module

Posted on Sep 08, 2009

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How to disconect the control cables on 1997 geo metro heater control?


does the fan work on high.
yes, then the heater resistor block is burned up. replace that
or look at it to see if the coil there are burned up and gone.
please post systems first, then your guess.
the FSM covers all this, step by step, take apart dash. under
HVAC chapter,.
alldata.com log in and its there.
factory service manual.
removing the control is tricky on all cable cars.
you must get the cables loose before the panel can move out.
the cables all clamped down or they will be dead. (all cars with cables drive)
please post of HIGH speed blower works on high first.
why do this the hard way, at the worst we can use a voltmeter
and prove what is dead, first.

see those rules on cables in the FSM below?
ill not post the panel Remove
  1. Disconnect the negative battery cable.
  2. Remove the heater control unit from the instrument panel.
  3. Remove the mode and temperature control cables at the heater case. Remove the cables from the vehicle.
  4. Remove the fresh/recirculate control cable at blower case and remove from vehicle.
  5. Installation is the reverse of removal.
  6. Adjust the cables prior to attaching at heater control unit.

now lets look at the blower, dead, on all speeds but HIGH , i bet.
?????????????????
this is your cave man simple blower
so if FUSE marked HTR is good, and 12vdc is on both sides of
fuse keyon, then it is good,. and 12vdc lands on motor top
where below on HIGH the blower and switch works on high.
if say the right side resistor blows up, (as all do)
then all lower speed fail. and DC power fails to reach the fan motor.
how is that? clear>?

25490481-331th0o4ygoodik5f23zyrbq-3-0.jpg

Feb 27, 2015 | 1997 Geo Metro

1 Answer

I have a 2011 jeep and recently my heater has not been working. When it does it makes a rattling noise and it also does not heat the feet.


there are these things that must work first.
1: engine hot.
2: heater core hot.
3: blower runs full speed on high.
4:dampers working.

there are simple tests for each, do you want us to guess. or tell you
how to do tests.
first tests is
fan blows full speed, surely you know that sound and know flow
at all vents in all modes. did you try all modes> up, lower, both levels>
and do you get heat moving fast in, non recirc mode (fresh air )
do you, if yes, the core is working, check off #1 and 2
leaving blower.
if the blower makes noise, (using a $5 stethoscope) then it does
have problems. only you can tell us this fact we can not listen
to any car , here in net bunny land.

Feb 17, 2015 | Jeep Cars & Trucks

1 Answer

Heater is not working


HEATER BLOWER MOTOR


Its faulty blower motor resistor. The low and medium speed on blower motor is controlled by resistor and its actual speed is high. So because resistor is not working, blower motors actual speed which is high is working.


It can be faulty blower motor or faulty blower motor resistor. Get the blower motor inspected. If it's faulty it has to be replaced.


=======

For blower motor testing and replacing, check the link below: ----

Blower motor Testing/replacing for all vehicles?

http://repairhelpcenter.blogspot.in/2012/02/blower-motor-replacing-for-all-vehicles.html

------------

These will help.

Thanks.

Nov 28, 2012 | 1988 Honda Accord 4 Door

1 Answer

Honda Accord 2002 heater blower control works only in the high position. The 1, 2, and 3 positions do not work but the high (4) does.


The heater blower is normally controlled by voltage sent to the blower via a resistor network.
In this case it seems that this unit also called the fan resistor is defective.
I assume that 4 is the position where the blower is running HIGH and in this position the blower is powered directly without using resistor for lowering the speed of the blower. In step 1 - 3 the blower is powered via the mentioned resistor network.

In my opinion the resistor network is defective.
Replace it !!!!.

Jan 31, 2011 | 2002 Honda Accord

1 Answer

Heater fan only works on "high speed"


All cars are designed with a blower fan motor that pushes air through the ventilation system. This air is processed by a series of vents to direct the air to various positions. Example: heater, air conditioner and defrost modes. Most blower motors are power by a basic electrical circuit that utilizes a multi resistor or a solid-state resistor to control different fan speed modes (low, medium low, medium and high). If the resistor malfunctions it may lose one or more of the lower fan speed settings.
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Mar 02, 2010 | 1999 Buick Century

1 Answer

Hidh speed on heater blower. In other words


Yup. Refer to your owner's manual for location. The HIGH side of the blower is fused on it's own circuit, usually a 15 AMP fuse.
Good Luck . . .

Dec 27, 2009 | 2006 Chevrolet Silverado 2500HD 2WD

2 Answers

F150 1997 ford heater fan only blows on hight


Plan on finding a melted blower motor resistor. Usually when the blower goes single speed, the blower motor resistor is the cause.

You can find it on the passenger side, looking up behind the dash / Glove box area.
In this picture the passenger side kick panel ( where the inertia fuel switch is at ) is on the right hand side of the picture.
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This is what it might look like when you get it out :
76bb5d6.jpg
The blower motor only has the 1 fuse and blower motor relay on it. If it works on high, those are OK..

Parts should be less than 75.00 total from a dealer, and it is a metric socket and lay on your back on the passenger side floor repair, real easy and quick.

Nov 16, 2009 | 2004 Ford F150

2 Answers

My 02 Stratus heater only works on high. Any idea


Your blower resistor is bad. It controls the mutiple speeds to allow you to go from low/med/high. When it goes bad you get one speed or no speeds....It's about $20-$50 at any local auto parts store. It mounted directly to the speed switch or on the heater plenum unit on the passenger side behind the glove box....

Nov 05, 2009 | 1999 Plymouth Breeze

2 Answers

Blower only works on high speed


i agree with solution 1. i see it all the time

Jul 29, 2009 | 1999 Plymouth Grand Voyager

2 Answers

HEATER BLOWER MOTOR ONLY WORKS ON HIGH SPEED


THERE'S A SENSOR UNDER THE PASSENGER SIDE OF THE CAR UNDER THE GLOVE COMPARTMENT YOU HAVE TO LOOK WAY UNDER JUST LAY DOWN ON TOP OF THE MATT IN FRONT OF THE PASS SEAT IT HAS 2 SCREWS ON IT UNPLUG IT THEN UNSCREW IT TAKE IT TO THE DEALER IT COST ME ABOUT 30 TO 50 DOLLARS BUT THAT WAS THE PROBLEM I HAD. GOOD LUCK

Jan 23, 2009 | 2002 Dodge Durango

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