blower motor problems
 

well a month or so ago i was fixing a problem with my radiator fan and wile i was diagnosing the prob i did something to the blower motor relay that made it stick on once or twice. so that finally workd it self out and now a month later im having problems with my blower motor. so my first idea was umm let e go pick up a new relay right...? well i did that and its still not working im in cookville tn right now without many tools but i can gt ahold of most anything i need from a autozone or something. well any help would be great :)

RE: blower motor problems
 

Do you have ATC, which is Automatic Temp Control? If so, then you have a blower control module that is electronic and has a transistor that controls blower ground.

RE: blower motor problems
 

no no atc just the manual ive tape on the side of the motor and it seems to runfor a sec sometimes so i guess the motr is jut goin bad. now im just trying to figure out how to replace it i guess or maybe i can buy new brushes for the motor either way its gotta come out gues that could be a problem idk how it omes out

RE: blower motor problems
 

See one of my earlier posts about aftermarket relays that are much heftier than oem and kick on at a lower templ

RE: blower motor problems
 

Don't think a bad motor is the cause, it has to have power to run, so look at that end of it.

a/c problem
 

I was refered to you by another member who indicated you may have more info on the 99-HVAC no comm. I have done the basic test for power, ground, serial data wires to control head are good. The brown wire from the ign on to the control head does not power up with key on it remains grd. Got tired after that and quit. So what do you think? [sm=thanx.gif]

RE: a/c problem
 

When you say the wire is "grounded", the brown wire is a power source and if it is truly grounded then the HVAC 10a mini fuse would be blown. If the fuse is good and you have no power across the fuse, then suspect the ignition switch. Get back to me on what you find.

RE: a/c problem
 

what i mean by grd is test light shows grd with key off or on. I have power across the fuse and to org power all the time wire. The blk grd also shows good. I did aply power to the brn wire and it showed to draw power but nothing on the panel. I really do not want to buy parts i do not need as they are not cheap. Is there a test for the control head to see if it is good? [sm=americanasmiley.gif]

RE: a/c problem
 

Is your test light clipped to positive side or negative on battery? Sometimes test lights will fool you. If you have a volt meter, that is better for testing. Also, is the connector plugged into the control or unplugged? If you have power across the HVAC fuse, not the HVACCON fuse, and not at the control assy., then you might have a wire broke. I am referring to the brown wire which should have power with key on. Does your car have manual controls or ATC?[8D]

RE: a/c problem
 

I sent you a PM with a wiring diagram attached for ATC car, if manual let me know and will send other. [8D]

RE: a/c problem
 

:)I have this diagram and the brn 41 has no power with key on. The orange wire 540 does have power all the time. white 1038 is good from star to control head and black 150 is good also. However the green 1038 to PCM has not been tested yet. Tan 63 is good and red 1342 is good and has power. So what should the green wire values be?:eek: The a/c would usually come on after a while and usually the first time you start up after that it was if your lucky:( I really thank you for the help you have offered and hope I can return the same to you one day.

RE: a/c problem
 

If the brown has no power with key on, it should and that is your problem, at least some of it anyway. If you have power across the fuse but not at the head, then broken wire somewhere. Good Luck on finding it.

RE: a/c problem
 

When you put power on the brown wire, did you do it at the head? If you did and you have powers and grounds, then the head is kaput. I would look into that no power on brown wire situation.

RE: a/c problem
 

Let's back up here a minute, as Tim The Tool man says "back the truck up". What is your original problem? I've been going off on a wiring tangent here and maybe going down the wrong road. Is the control not working or is your blower motor not working? Does your compressor come on? Serial data lines are on the communication buss to feed info to the ECM for all variety of inputs to control outputs, not to control your blower motor. It uses serial data on a/c to control idle, injector pulse width, cooling fan control. If you have no blower motor, the blower control module responds to commands from the control head for blower speed via the tan wire circuit 63. I've seen lots of blower control modules go bad, usually the transistor in the module. The red wire is the power feed to the motor and voltage is varied via the transistor in responce to commands from the control head depending on commands you have set into the head, such as temp control, manual override blower speed and such. Hope I have described operation a little more clear for you. Sorry for the novel. LOL :D