Question about 2004 Cadillac CTS

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WHAT IS THE MOST COMMON REPAIR FOR 2004 CAD. CTS DUAL HEATER ONLY BLOWS HEAT ON PASS SIDE -- NO HEAT FROM DRS SIDE ?? THANKS,

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I would guess that the control that changes the flow of air from one duct to the next is broken and likely have that one side in the closed position. Old systems used the slide lever to open and closed ducts, but newer stuff, especially cadillacs, use a lot of electronics so it is probably controlled by a motor. I would have some diagnostics done to see if the motor controlling your duct work has fried.

Posted on Nov 19, 2009

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If the AC compressor was working full time including when the heat was on in the winter, this would certainly cut short the life span of the compressor. Usually, the compressor won't come on unless climate control is calling for AC. If this was the case, the issue is more likely the climate control itself, either a sensor or the whole unit. Should have been caught when you had it diagnosed in the winter if this was when you had it in the shop. Hope this answers your question. Best of luck.
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