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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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6,421 Posts
Discussion Starter #1
The Climate Control in my '76 DeVille isn't working correctly and I was wondering if anyone could point me in a direction to try and fix it. This is what it does when I move the slide lever to each setting.

Off: Blower on low from floor (normal cabin venting proceedure)
Econ: Nothing
Def: Works normally
Low: Blower on low
Auto: Nothing
High: Nothing

The only thing I can come up with is the blower motor is shot and only works on a low setting, I dunno. Any thoughts?
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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6,421 Posts
Discussion Starter #3
Programmer aye? Where can I find this component? Is it something I can get or is it a special Cadillac only part?
 

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'09 Dodge Challenger RT, '84 Cadillac CDV, '05 Ford Crown Vic Sport
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2,241 Posts
Might it be the resistor block for the settings? If that's shot then some of the settings might work, but others may not. Just my two cents.
 

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1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
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6,421 Posts
Discussion Starter #5
What about the Auto Relay? My FSM seems to mention it for "Fan Operates Only on Low."
 

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70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
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3,310 Posts
I think the blower relay has failed. I have no idea if you can buy new ones.
 

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77 CDV, 06 DTS III, 69 FWB
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10,022 Posts
Both the blower relay and the programmer are available. The blower relay is cheap, the programmer, not so much. Check for tight connections at the control head, and for opens in the blower circuit wiring (you'll need the wiring diagram in the FSM to do this). Usually when the blower relay goes out, the blower won't work at all (except in DEF). The programmer is what steps the blower speed up and down in AUTO and controls the air distribution doors based on feedback from the in-car temperature sensor.
 
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