STOP:The answers to the questions are located in the comments. Also, if you do not see the information you seek in the first post, be sure to use the "Archive Categories" list in the left column or the search bar above. If you still need help, feel free to Ask Sparky

2005 Chevrolet Silverado, Driver's Vent Hot Passenger Vent Cold

0 comments Posted by Sparky at 7:17 PM

Sparky,
This past weekend I received the replacement Blower Motor Resistor for my '05 Chevy Silverado, installed it and now the blower is working fine.  However now the driver's side will only blow hot air (being in 100 degree texas heat I'm not sure if the heater was on or if it was just outside air) it will not blow cool air at all. The passenger's side seems to be working fine.
My assumption is not that the part is bad or that I installed it incorrectly, I would just like some tips on what I should do next.

Thanks for everything

Mike

Hi Mike,

First you need to try a recalibration procedure. Set the controls to high blower and temp to medium. Make sure the key is off. Disconnect the negative battery terminal for at least one minute. Reconnect the cable, start the engine and DO NOT adjust the controls. After about 4 minutes turn the key off for at least thirty seconds and then restart the engine, check the controls for function. If problem is gone calibration worked if it is still there you will more than likely have to replace the driver's side blend air door actuator, pretty easy. Let us know if you need more help.

Sparky

Sparky
 
The recalibration procedure worked like a charm. Thanks for your help, 
the next time I have a problem with my truck I know who i'm gonna ask first.
 
You're the best!

-Mike

 

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2002 Chevrolet Trailblazer, Will Not Idle

0 comments Posted by Sparky at 9:05 PM

I have a 2002 trailblazer Wednesday I had the battery replaced, since then I notice that whenever the a/c is cut on it dies out



Hi Sam,

It sounds like carbon build up on the throttle plate. If you can stand to drive it long enough the computer should learn around the condition just like it did over the life of the vehicle so far. If you want to clear it up sooner you should clean the throttle plate. Most shops keep the cleaner and will clean it for a fee or you can purchase throttle plate cleaner at most parts stores. If you clean it yourself you should wear some sort of protective gloves as you need to spray the clean on a rag and then wipe the throttle plate clean. Some disassembly is needed. If you have Throttle Actuator Controller (no throttle cable between throttle body and gas pedal) Be sure not to spray the throttle bore as it can damage the motor bearings and seals. Do you have a service engine soon light on?Sparky
No just changed the battery because I had to jump it off a few times and took battery in for evaluation it was still on under warranty so they just prorated the price of new one. Then this started happening. So just spraying this down will clear it up and car will not die with Air Conditioner on.

Hi Sam,
Yes, Cleaning the throttle body should correct the condition. You should be more sure that it will after you inspect and find some carbon built up on the throttle plate and throttle bore. However I do caution you about "spraying it down" , Apply the cleaner to a rag and wipe it clean. Excessive amounts of the solvents can damage seals, bearings, sensors and idle control motors!!!! Make sure you only use approved throttle plate cleaner. Other cleaners can damage interior coatings. Sometimes you have to wrap a rag around the end of a screwdriver or similar device and basically make a large Q-tip in order to clean it due to depth.
Sparky

 

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1997 Pontiac Grand Prix, Bower Erratic, Inop

0 comments Posted by Sparky at 8:45 PM

Hi,
The heater / AC blower motor works erratically. It will not run on any speed except High most of the time.
However, even at "5" (Hi speed setting), it will not start immediately most of the time. If you set it to 5,
it may take 5 seconds or longer to begin running. Even after it is running it will not run at 4 or any lower
speed. Sometimes it did begin to run at a lower speed if you just left it there...it may start several minutes
later but was not predictable at all.
I am an electronics tech so have tried troubleshooting this situation. Initially, I assumed it was going to be
the "resistor" block since it at least always worked at high speed but got to where it never works on the
lower speeds. Then I got to thinking about this failure to start immediately on the high speed. I thought
if the motor "bearings" are getting bad, they may be resisting the startup on the lower speeds to where
it won't run except on high speed (with full voltage).
So I temporarily connected a new blower motor but it behaved the same way... runs after several seconds
of waiting, on high speed only. It doesn't run on any lower setting. I then checked for 12 volts at the connector
with the motor disconnected. It shows about 11.5VDC on the high setting and just a few tenths lower on each
lower setting. (I'm assuming with no load it is not showing the actual voltage drop on those lower settings
that would be normal with the motor connected).
So we know it isn't the motor and also not the resistors since it doesn't explain why the motor still takes
several seconds to start when on High as this should be applying the full battery voltage instantly. With
reading some amount of DC even through the resistors, they should not be an issue nor the series
hi temp fuse.
I noticed a relay "click" each time the blower switch is turned on so assumed it's contacts may be pitted
and responsible for part of the problem. After locating the "box" containing the relay, I noted there were
two other relays on the PC board which also contained 2-3 integrated circuit "chips" . The board had two
multiwire connector blocks which were the connectors for the cabling from/to this assembly.
I'm not familiar with this assembly. I have a "generic" diagram of the blower, switch, and relay but it doesn't show
any other circuitry involved. I'm wondering about the other components on this circuit board and if they are
involved in the function of the blower and it's turning on. I also noted that when the blower switch is turned
on to a low number, you hear the relay click on, but when up to the high setting, it clicks back to off???
Manually closing the relay contact seemed to have no effect on the motor.
So... after all this discussion, what are your thoughts on what is going on here and is this circuit board the
source of all the problem here? Is the circuit board repairable at a component level by myself? If I could get
the part numbers off the IC's, I may be able to change them as there are no other "active" parts on the board
and appears to be nothing overheated/burned.
The numbers found on the "box" with the relays were:
10097889 and 7156J These don't appear to be the GM part numbers and there were no other numbers found
except an insignificant one on the board itself.
Thanks for your support,
Harlan

Hi Harlan,
The first thing to check when the inop condition is power to the three fuses in the right hand fuse box. HVAC Control / 20 amp, HVAC Hi / 30 amp, DIC/HVAC 10 amp. The HVAC Hi fuse should be hot at all times and the other two should be hot with the key on. If all are okay the next step would be to check power and ground at the blower motor itself with all of the harness connectors in place. Let me know what you find and I will provide more info as you test.
Sparky



Hi Sparky,
Thanks so much for your tips. I have a wiring diagram of the circuit in question. After much troubleshooting, I did find the
supply voltage to the blower motor switch was very low to none! It at times would measure around 5 volts. Further checking
at the HVAC control fuse found the same condition at the SUPPLY side of the fuse.
I temporarily bridged that fuse to the adjacent fuse's supply (heavy gauge wire) and everything worked perfectly... all the
speeds of the blower switch functioned as they should. Oddly, with the fuse removed, the voltage on the supply side
would read normal but as soon as the fuse was in and the blower switch on, it dropped to nearly zero.
So the problem now is why and where is the 12 volt supply to this fuse losing it's voltage. There are two lighter gauge
pink wires on the back of that fuse block which carry the supply voltage. I have not been able to locate where they
originate due to the cumbersome wire bundle they run into. Apparently this circuit goes through the ignition switch but
then where does it eventually connect to the battery positive? With the small gauge wire being used (maybe 18-20 gauge..
which seems rather light for running a motor that consumes a fair amount of current) it wouldn't seem likely that much
arcing (corroding / oxidizing) would take place resulting in this condition in the switch.
Also you would think messing with the ignition key and switch position would have an intermittent result where
it would at times work at least to some extent.
If you can find the wiring diagram of how this fuse is supplied and where the supply wires physically run, that would be the
next step and a great help. At least then I could check the voltage at the input to the ignition switch to hopefully rule it out.
BTW... is the ignition "switch" removable from the key function itself... so the electrical switch could be replaced without
requiring a new "key / lock" assembly?
Thanks very much for your time and wading through this mess... been quite a struggle... aching back and sore neck from
crawling around under the dash, etc. :-)
Harlan
Good Morning Harlan,
As you stated in your first email, this has been an ongoing erratic condition that has gotten worse. The ignition switch is your problem as mentioned earlier. To check go to the ignition switch connector at the base of the column. It should make up the center part of a larger junction connection. Check both large red wires for 12 volt supply. If 12 volts is not present check the ignition fuses under the hood. If it is present and it most likely it will be then proceed to check the orange wire for 12 volts with the key on. It will not be there. Next jump the orange wire to one of the red wires and see if the blower now works properly.
The electrical part of the ignition switch can be changed without having to deal with the lock cylinder and key issues. It is fairly simple to change so don't be intimidated by it. You will probably have to invest in some torx bit drivers and sockets in order to replace it if you do not already own them. Any repair manual should show procedure but if you need help just drop me a line.
Sparky,


Hey, Thanks for the speedy reply... sure do appreciate it!
Well suppose it may be the ignition switch then if you're confident
there is nothing else in the "line" that would possibly limit the
voltage the way this behaves.
I don't have the car here now to look into it so will see what happens
when I try the steps you suggested.
Thanks again.. will try to let you know the results.
Harlan

Good Morning Harlan,
As you stated in your first email, this has been an ongoing erratic condition that has gotten worse. The ignition switch is your problem as mentioned earlier. To check go to the ignition switch connector at the base of the column. It should make up the center part of a larger junction connection. Check both large red wires for 12 volt supply. If 12 volts is not present check the ignition fuses under the hood. If it is present and it most likely it will be then proceed to check the orange wire for 12 volts with the key on. It will not be there. Next jump the orange wire to one of the red wires and see if the blower now works properly.
The electrical part of the ignition switch can be changed without having to deal with the lock cylinder and key issues. It is fairly simple to change so don't be intimidated by it. You will probably have to invest in some torx bit drivers and sockets in order to replace it if you do not already own them. Any repair manual should show procedure but if you need help just drop me a line.
Sparky,



Hello again,
After further troubleshooting, I did conclude as you suggested, the ignition switch is the entire
problem. I've never had this part of a car apart before so it was a bit challenging to get at the
switch area on the steering column. Managed to have something close to the necessary tools
to do the job but sure was a lot of work.
Another thing that made it more difficult was that the wiring harness to the connector block under
the dash needed to be reworked. I had tapped into about 5 wires some time ago when installing
a remote car starter. So I had to get that all out on the bench and splice those lines back into
the new wiring harness. Yes the switch is apparently only available with it's attached wiring
harness with black plastic connector block.
Well this has been a difficult one since I was hoping it would only be the blower motor at the
beginning but was really the ignition switch... can't wait to tear it apart and see what contacts
look like to cause this trouble. Also left in the new blower motor as it occasionally would squeal.
Thanks very much, Sparky and have a great day!
Harlan



 

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2000 Pontiac Grand Am, Blower Problems

0 comments Posted by Sparky at 8:37 PM

My heater & A/C control (fan) switch has 1 to 5 settings, but the fan only operates on 3, 4 and 5.
The car is a 2000 Pontiac Grand Am SE.
I would like to know if it is the fan motor, a resistor of some sort or possibly the switch? Also would like information as to where the problem lies and the procedure to fix it.

I viewed your Web Sites "2005 Chevrolet Silverado Blower Inop" and thought that was an excellent repair procedure.

Your assistance will be appreciated.

Nelson


Hi Nelson,
More than likely the blower resistor is the problem. It is located under the right side of the dash behind the glove box area. In order to test you will need to remove the lower hush panel and the blower resistor should be located next to the blower motor. Disconnect the harness connector and check for voltage at the yellow wire with the switch in position 1 and check for power on the tan wire with the switch in position 2. If powers are present the resistor is faulty. If powers are not present then there is a problem at the switch. Due to the fact that you stated that positions 3,4,& 5 work, this confirms that the blower and the blower relay are working. If you happen to find signs of water please make sure that you clean the a/c drain tube or the problem will return.

Sparky





 

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1992 GMC Vandura, Rear Blower Location

0 comments Posted by Sparky at 7:50 PM

I read the archives but didn't find an answer. I have a 92 GMC vandura 2500
and the rear ac blowers doesn't work. Where is the Fan for the rear blower.
I have replaced the front fan but I can't locate one for the back? s it 
ducted from
under the dash ?

Thanks
Nick



Hi Nick,

If it is a factory installed unit it will be in the rear of the van, on the passenger side, behind the trim panels. 

Sparky

 

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2005 Chevrolet Silverado, No Dash Lights

0 comments Posted by Sparky at 7:45 PM

The gauge lighting is beginning to disappear on my 2005 Chevrolet 1500 pickup truck. Is there any way to change the bulbs? Are there even any bulbs to change? The dash seems to be all one board?

Thanks for your help.

 

Al



Hi Al, 

I have found no listing for replacement instrument cluster bulbs for your truck. I would suggest calling your local GM parts dept to confirm if replacement bulbs are available or not.


Sparky



Thanks for your help. You would think that they would make these things a little easier to change or at least last longer than 4 years.
Thanks again for your help.
Al


 

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1999 Buick Century, Blower Squeals

0 comments Posted by Sparky at 7:13 PM

I  have a 1999 Buick Century, and every time  I turn on my AC or heater it makes this loud squealing noise. What could be the problem and how cheap is it to fix?!

Thank you.

Krista


Hi Krista,

Assuming that the squealing noise is coming from under the passenger side of the dash, I would say your blower motor needs to be replaced. I have included a couple of links that relate to your repair although they do not show how to replace the blower motor itself. The costs can vary quite a bit depending on quality of parts used and if you are replacing yourself or having some one do it for you. In my own shop the whole job would run about $250 + tax, using an original equipment blower motor.

http://www.sparkys-answers.com/2009/03/2000-buick-century-blower-will-not-turn.html

http://www.sparkys-answers.com/2009/03/changing-cabin-air-filter-on-2000-buick.html


Sparky

 

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