Question about 2003 Chevrolet Impala

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Air control wont work on speed 1, air is blowing from 3 points

Blower will only start at #2 speed, then we noticed air mostly coming from floorvents, some still comes at mid vents and defroster. doesn't matter where you have control set at.

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  • Chevrolet Master
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Your speed controler is in need or replacement.. if it only works in that one speed then it is like a reastat.. your motor speed is controled by this switch .. thanks and holler if you need more. Jerry

Posted on Apr 24, 2009

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1 Answer

What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?

Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

Blower Motor and Resistor Diagnostics by Wells

Jun 11, 2017 | Pontiac Cars & Trucks

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Where is the heater blower relay located on a 1997 Chev. S-10 Blazer

It's located on the blower motor. If you can see the blower motor it's right there. That controls your fan speed. Hope this helps.

Mar 18, 2015 | 1997 Chevrolet Blazer

1 Answer

Ac blower motor stopped working

YJ car.
the blower is dead. is that it?
does it blow full speed on high
do you have 12v on terminal A of blower , term B is 0v ground
got that, then the blower is dead.
if not 12v, then the controls are bad.

page 47
4 parts to make blow
1: fuse 12 good.
2: switch heater /on off.
3: high, med,low speed, use high, its direct.
4: the blower,
one of those points has no 12v on high,
use a simple voltmeter to find the failed point.

Jan 14, 2014 | 1994 Jeep Cherokee

1 Answer

The blower motor for the air conditioning doesn't come on. The compressor comes on. I ohmed the blower motor and it was good. I jumped the blower motor and it turned freely. With the control set 1 2 3...

> With the control set 1 2 3 4 it does blow any air,
? does NOT?
A common problem with this control is the failure of a stepped resistor which causes only the highest speed to still function since this bypasses the resistor.
Tracing the leads from the fan speed switch may help locate it.

Sep 04, 2011 | 1997 Honda Accord

2 Answers

The fan blower that blows cool or warm air through the vents will not work and I am wondering how you remove this part (the cover) to repair this part?

You could just have a blown fuse but the fuse blew for a reason.
There are a few possiblities, I'll try to list them in the most likely order;
1) blower motor speed control resistors.
2) blower control switch
3) blower motor
The blower motor and speed control resistors are usually accessable from under the hood. Once you find the blower motor follow the wire that leaves the motor to where it plugs into the fire wall. This is the speed control resistor assembly. unplug the wires and remove the 2-3 screws that mount it to the fire wall. When you get it out you will find 2-4 wire coils on the back, these are the control resistors. If they are burnt or broken you need to replace them. If they look fine you need to test them with a Ohm meter or continuity tester. If they test good (having continuity) then you need to test the blower motor.
To test the blower motor, you'll need a jumper wire or an amp meter and test leads long enough to reach the battery from the plug in for the resistors. Plug the resistor assembly back into the fan plug. Fasten alligator clips to your jumer wire or use your test leads from the amp meter. Fasten your alligator clip to one end of the resistor assembly then touch the other end to the battery and listen for the blower motor to start. If it doen't start your problem is the blower motor. If it does start then your problem is most likely your fan control switch. Given the complexity of changing the switch and the many differences from vehicle to vehicle I can't tell you how to do that and I recommend you have a professional do it.

Jun 06, 2010 | 1997 Chevrolet Astro

2 Answers

Blower speed question (ac/heater). This just

This is definitely 100% the Blower Motor Resistor.
Replace this and all speeds will work fine.
This Resistor is defined with 3 to 4 wires going into it, and is located adjacent to the Blower Motor.
It is easily access, removed and replaced.
I will post an additional comment on Part Number, Price and where available.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at!

Feb 19, 2010 | 1999 Jeep Wrangler

1 Answer

The AC blows on #4 fan setting but doesn't blow at all on 1-3

That is the blower resistor. 4 is wide open, so, no resistance. I had 4 of them put into my truck. The wires were burnt and shorted the others until the problem was found. Check the plug if you do this yourself.

Jun 13, 2009 | 2005 Chevrolet Colorado

1 Answer

Fan wont work on 1 2 speed

sounds like either the spd. control resister or the spd control switch. The switch is what you handle, on the dash and the resister is on the blower box.

Jun 11, 2009 | 2002 Chevrolet Impala

2 Answers

Blower motor or resistor?

I had a truck about the same year with the same problem, it was the wiring harness, but id check the resistor and the fan first before replacing anythings,

May 20, 2009 | 2002 Chevrolet Silverado 1500

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