Question about 1997 Cadillac Catera

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My ac and heater wont blow out air but yet all my fans are working under the hood.

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You have a blower motor inside the dash that blows inside air. You will need to start by finding the fuse labled blower motor, and maybe a relay........

Posted on Jun 27, 2009

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Fuses blow because of higher than normal amperage in the circuit. Not sure what circuit the blown fuse is for but if it is for the fan the fan may be shorted therefore blowing the fuse. If you put fuse in while the ac was still on try shutting off the ac then putting the fuse in. See if it blows then if it doesn't then turn the ac on and if it blows you have at the very least isolated the system at fault.

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For clarification, it seems that you are getting air blown through the system but there is no temperature change, hot or cold?

Your heater control panel is cable operated with sliding knobs, not like the newer electronic controls with push buttons. It is a "mechanical" set up as opposed to an electrical situation.

Does the slider for the temperature control feel like it has tension and is moving mechanisms in the dash somewhere? If not, the cable, which has an "S" curve on the ends, may have slipped out of the arm either behind the heater control panel or at the AC box where the door is. Also, check the heater control valve on the firewall under the hood to see if the arm on the valve is moving properly when the temperature slider is moved.

When you push the "AC" button, do you hear fans under the hood/AC relays click on/idle drop? If not, you may have a separate AC issue, either very low or no freon. If the freon is just a little low, check the sight glass for the freon to see if you see bubbles when the AC comes on.

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Sounds like 2 different problems here. The ac gets warm when standing idle, is most likely the under hood fan not kicking on when ac is on. This may be a fuse issue or a relay. When ac is on, the fan should be on all the time. Relay maybe in an electrical box under the hood. Unplug the fan and test for power with a test light to see if the fan has power when ac is "on".

The inside fan not working on levels 1& 2 is likely the voltage ballast issue. this is an electrical block which controls voltage to change fan speeds. Usually found under the passenger side dash, right in the air flow comming from the fan and inside the air flow housing. Usually held in by 2 or 3 screws with a connector and 3-4 wires sticking out. this should be under $20 to buy and quite easy to change, if you can find it. Try behind glove box etc. Do not test the new one without it being in place, as it may burn out very quickly without the air flow to cool it.
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YOU HAVE TWO SEPERATE FANS TO BLOW THE AIR ONE IN FRONT AND ONE IN THE BACK CHECK THE FUSES FIRST UNDER THE DASH AND SECOND UNDER THE HOOD SHOULD BE ANOTHER ALSO CHECK THE RELAYS UNDER THE HOOD THE PUSE PANEL COVER SHOULD TELL YOU THE FUSE LOCATION AND NUMBER AND AMPERAGE OF THE FUSE

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