Blower Motor

[RHGuyettejr]

Hi,

I have a 98 chevy k1500 4x4 305, and was wondering about the blower motor in the heat/ac system. The trucks motor only works on the High setting, I was told by some people there was a low speed motor and high speed motor, and that probably the low speed motor had gone out the window, but by others it could just be a resistor? What would you recommend I test first before purchasing a new motor?


Thanks,

Jr

[ieetgluu]

Id say it has one blower. The Haynes for NBS shows measuring resistance between the resistor pigtail purple feed wire and the four resistor terminals A-D. The OBS Haynes doesnt speak of a resistor or testing, but shows a blower resistor in the wiring diagrams. So perhaps the heater control itself on a OBS has more control over blower speeds than the NBS resistor. Not sure, wish I could help more. Im sure someone else has run into this and can help with proper testing.
I remember the blower control buttons not wanting to work on my OBS and from time to time needed a swift punch to get it to respond. However use of force not recommended :)

[1988 GMC 355]

The resistor is bad, it is a pain to get to but can be replaced.

[loki223]

Resistor, i've had it happen to me before. if you wake on Saturday morning and think to yourself, i don't have anything to do, go ahead and do the resistor. it'll take up some of your day. lol

[SR PREZ]

again I vote the resister as stated above. Common known problems with GM vehicles.

[tricky01]

I just went on ahead and did both why I was into the dash. Need small size ratchet and lil hands. Screws were easy to come out just a pain to put them back. Just if you change the fan get a look at it because when I went to get mine they had two listed and I found the right one the hard way.

[billmelater]

I just did mine tonight. All I needed was a 7mm socket and short extension. I had to loosen the blower motor to move it slightly out of the way, but the hardest part was getting the shroud screws back in. The first time you do it, it might take 45 minutes. The next time it will take ten.
The resistor plug-in (Chinese after-market)was $26.99 at Auto Zone, for my 2000 1500. While I was in there, I changed the cab air filters.

[Botan]

Id say it has one blower. The Haynes for NBS shows measuring resistance between the resistor pigtail purple feed wire and the four resistor terminals A-D. The OBS Haynes doesnt speak of a resistor or testing, but shows a blower resistor in the wiring diagrams. So perhaps the heater control itself on a OBS has more control over blower speeds than the NBS resistor. Not sure, wish I could help more. Im sure someone else has run into this and can help with proper testing.
I remember the blower control buttons not wanting to work on my OBS and from time to time needed a swift punch to get it to respond. However use of force not recommended :)


just did mine today, watch my video :) i go over the 3 things that could be the problem. http://www.youtube.com/watch?v=Acc3JNbUtxo

[Botan]

Resistor, i've had it happen to me before. if you wake on Saturday morning and think to yourself, i don't have anything to do, go ahead and do the resistor. it'll take up some of your day. lol

i filmed myself doing it, it took 17 minutes start to finish, 97 silverado

[oldred95]

Yea the resistor is not hard. Try changing out the recirculate door actuator with the dash still in place. Look up from the bottom side of the heater case and you see a very small gap between the blower motor and heater case. The recirculate door actuator is up in there, two screws and a connector and its out but its a TIGHT fit. Did one though in about 30-40 minutes and even got BOTH screws back in and tight.

[RHGuyettejr]

Thanks for all the replies, I am used to stuff being a pain to get at and such, but it is good to know it is most likely a cheap fix. I will add that to the list with front hubs and fuel lines. Haha.


Thanks guys.