Question about 2000 Chevrolet Blazer

1 Answer

2000 CHEVY BLAZER NO HVAC( RE-POST w/MORE DETAIL)

The whole hvac system stopped working . Mechanic said " bad blower module" I replaced that ...no change. Since then I have bypassed all modules, fuses and such to the blower motor ,which works fine when supplied w/ direct power. I have checked the hvac fuse and all others, they are all fine. At this point I have the Computer Climate Control unit removed from the dash and have tested the wiring harness which feeds it. With info found on-line I tested for voltage on specific pin numbers of the harness. With the info i have, it seems to check out good. So this leads me to believe that its the CCC unit which is bad. I'm still not sure but it would make sense that with a bad control unit the proper voltage would never make it to the blower module/motor. So that's where i'm at. Any suggestions are appreciated. I'm hoping maybe I just overlooked a relay somewhere.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 94 Answers

Replace the control unit this should solve your problem

Posted on Mar 08, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Im trying to locate the fuse for the rear blower in my 2008 gmc arcadia, can anyone help me


RR/HVAC fuse 30amp located in the under hood fuse box. You can check it but highly doubt it's the problem . More then like it's the blower motor control module that's bad .
Circuit/System Description
The auxiliary blower motor is a variable speed fan. The HVAC control module controls the fan speed by sending a pulse width modulated signal to the auxiliary blower motor control module. The auxiliary blower motor control module varies the duty cycle across the auxiliary blower motor in relation to the pulse width modulated signal. The auxiliary blower motor speed can be adjusted from 10 percent to 90 percent duty cycle (PWM), 90 percent is high speed fan.
Watch this video for testing purpose's only , this is a front blower motor control module . Same way your back one works . GM is GM Chevy , Buick ,GMC , Cadillac .

Oct 21, 2016 | GMC Cars & Trucks

1 Answer

Missing variable control voltage on the blower fan control module on a 2008 Buick lucerne


What are you using to test this control signal ? Were you on right wire ?
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !

Sep 26, 2016 | 2008 Buick Lucerne CXL

2 Answers

2008 dts caddy blower motor resister location


Your not going to like to hear this , but you'll need to take the dash apart !
Blower Motor Resistor Replacement
Preliminary Procedure
  1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement .
Preliminary Procedure
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  3. Remove the evaporator tube from the thermal expansion valve. Refer to Air Conditioning Evaporator Hose Assembly Replacement .
  4. Remove the heater hoses from the heater core. Refer to Heater Hoses Replacement .
  5. Remove the brake pedal bracket assembly. Refer to Brake Pedal Assembly Replacement .
  6. Pull back and reposition the carpet.
  7. Remove the lower instrument panel (I/P) support brace. Refer to Instrument Panel Center Support Bracket Replacement .
  8. Reposition the auxiliary air distribution duct. Refer to Auxiliary Air Distributor Duct Replacement .
  9. Remove the instrument panel carrier. Refer to Instrument Panel Carrier Replacement .
  10. Disconnect the HVAC module assembly electrical connectors.
1
HVAC Module Assembly Nut (Qty: 5)
Tip
Tighten the nuts in sequence.
Tighten
9 N?·m (80 lb in)
2
HVAC Assembly Module
Disconnect the blower motor resistor electrical connector.

Jul 28, 2016 | 2008 Cadillac Dts

3 Answers

Air blowing cool on passenger side warm on driver side how to fix this


sounds like you have a temp door motor problem on the drivers side. the motors seize/stick and have to be replaced.

Aug 09, 2015 | 2005 Buick LeSabre

2 Answers

What causes a/c to blows cold on driver's side and hot on passenger side ?


There is a little motor on the heater box under the dash that needs to be replaced. It's called a blend door actuator...

Mar 16, 2015 | 2004 Cadillac DeVille DHS

3 Answers

I have a 2000 chevy blazer the blower works on 1 2 and 3 but it wont work on 4 I changed the dash switch and the resister but that didn't work


There is a relay in the under hood fuse box , blower motor relay .When switched to high it energizes the relay allowing power from the HVAC fuse /30 amp to flow direct to the blower motor. from pin 30 to pin 87 , if you look on the side of the relay there is a diagram .For all other speeds the current flows from the switch through the resistor through pin 87a to pin 30 on to the blower motor ! Check the HVAC fuse in the under hood fuse block .IF the fuse is good check for continuity between the fuse side with out B+ that means pulling the fuse and using a volt meter to see which side has power and checking the side that doesn't have power to pin 87 at the relay socket ! Probably a bad fuse or stuck relay . Pull that relay and try a different one. You can get wiring diagram at www.bbbind.com click on technical information ,then click on Technical Service Bulletins & Wiring Diagrams .then on next page go down to the bottom and click on I agree . next page click wiring diagrams ,then just fill in you vehicle information .then HVAC system . click on diagram, then you will see 7 links , click on the 5th one and that's the diagram for the blower motor circuit !

Jan 11, 2015 | 2000 Chevrolet Blazer

3 Answers

Heater not working in 96 chey blazier


1. Check engine coolant.
2. Check heater core.
3. Check electronic control valve.
4. Check thermostat.

The problem lies within one of these four possible issues. =)

Nov 21, 2012 | 1996 Chevrolet Blazer

1 Answer

2005 GMC Envoy. Blower will not work all fuses have been checked.No heat or A/C, ANY THOUGHTS


If this a manual HVAC system, the blower motor resistor pack is defective or the blower motor itself is bad.
If this is the Automatic digital HVAC, the blower motor control module is defective or the blower motor itself is bad.

Sep 25, 2009 | 2005 GMC Envoy Xl

1 Answer

Have a 2000 chevy blazer, just replaced blower module .still no heat or ac and selector switches don't light up when pressed


my 2000 chevy blazer zr2 4x4 the a/c switch that does 123 and 4,the a/c only works on num 3 setting.ive just replaced the whole a/c sytem and blower relay.it wont work on num 4 at all and when it does it cuts off on its own and then works on setting 3 only?what to do?

Mar 05, 2009 | 2000 Chevrolet Blazer

Not finding what you are looking for?
2000 Chevrolet Blazer Logo

360 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

60792 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...