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Purchased an '84 300 SD this weekend. Drove it about 300 miles in a West Texas wintery rain storm. So with wind, moisture and the occassional sun, we ran every aspect of the climate control. It worked great. Woke up on Saturday and it worked (I think) for a while, then nothing. No blowers, no switching from top to bottom, nothing. The temp will eventially change. You can feel the difference in air temp coming out from the by-pass air coming through. Summer is coming in Texas and I gotta get this going.

I replaced both fuses. The no. 11 fuse brackets were off color and the plastic was melted in the area. Nothing bad but a little. I could not really make a determination if it was from heat or something else. It was just not that bad.

The PO replaced a window motor the night before the the battery was run down when I arrived. We both were concerned. But it boosted off without any problem. And I never had any problem whatsoever during my long trip home.

I had the battery tested when I arrived. It is the large Interstate. It tested 761 CCA. So it is fine.

Nothing works on the Climate Control except the temp changer will change the by-pass air eventually. Any help appreciated.

----kyle
 

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chk blower first, connect power directly to blower if it runs, the problem could be fan speed relay, chk to see it this gets power, if so relay bad. if not, push button unit mey be deffective, also chk wires.
 

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Any advice on how to get to the blower and the relay? Looks like quite the task. Though I like to do most of the electrical work myself.
 

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REMOVE UNDER DASH PANEL, RT SIDE, & REMOVE GLOVE BOX FOR RELAY, MAKES IT EASY
 
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Push the buttons so its on high
reach down under the passenger side dash panel
feel for the blower motor housing, give it a good slap.
If it starts up you need new blower motor brushes.
IMO
 

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I still have not taken it the blower housing apart yet. The weather here has gotten cold and wet. So no need for the AC like a few days ago.

I tried the blower on high and banging the bottom of the dash. No response. I tried every combination on the Climate Control and banged the blower area. Still no noise came out of it. I tried with the key on and also the engine running. No luck.

Thanks for the tip though.
 

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Discussion Starter #8
Jako,

I have the glove box out, though I do not see the relay. Could you give me some directions.

Thanks, Kyle
 
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