Question about 1998 Cadillac DeVille

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AC COMPRESSOR WANT COME ON AND ENGINE TEMP GOES UP THEN DOWN WHEN DRIVING YOU CAN HEAR A CLICK UNDER THE HOOD AND THE ENGINE MISSES ONLY WHILE WHEN YOU THE CLICKING

AC COMPRESSOR WANT COME ON AND SOMETHING CLICKS UNDER THE HOOD AND ENGINE MISSES

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Either the fan is not turning on, unlikely or the radiator is plugged with mud. Wash with garden hose. When ac selected and snowflake light comes on does it blink then go out or stay on? And when ac selected does cooling fan under hood come on? It should we it her or not the compressor kicks or not. But if gets hot with ac selected then compressor turns but lack of airflow to cool engine radiator and ac condensor. Now. Cataliac threw u a curve ball. It's one or two fans for cooling under food and they are sometimes two speed. If two wires to motor then single speed if three wires then dual speed. Suggest take garden hose and spray the hell out of it. And also this car is notorious for getting leaves and debris caught between radiator and condensor. Bad part is the upper radiator support is not removable. So remove plastic cover that stretches from fender to fender and remove both long winded upper radiator mount screws and lean top of radiator to words rear of car and with flashlight check to see how big the mice nest is between radiator And condenser. Clean.

Posted on Jun 18, 2014

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    one_life_728 Jun 18, 2014

    engine not missing radiator fan is on and hitting something or wore out and out of balance

  • one_life_728
    one_life_728 Jun 18, 2014

    engine not missing radiator fan is on and hitting something or wore out and out of balance

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Most likely the compressor clutch has seized up

Posted on May 29, 2009

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1 Answer

Noise under hood - no a/c


Did you look under the hood or just hear it and not inspect for the source. Do not drive this until the noise source is found, if the AC compressor is frozen up it will burn the drive belt off.

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Jeep cherokee when in drive, front right under the hood clicks and the RPM's kick for about 2 seconds this cycles about every ten seconds.


its hard to say is your ac compressor kicking on i need more details on where the clicking is coming from ac compressor is a guess due to it raising rpms when turned on and makes clicking noise turning on and off

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I can hear something click on when I turn a/c


Is the sound coming from under the hood/bonnet? This is typically the normal sound of the A.C. compressor drive clutch assembly engaging or disengaging.

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My 2004 jaguar x-type ac is not working. the temp gauge inside shows that the ac is on, but nothing is blowing out of the vents. Please advise


check freon level first. You should hear the compressor clutch kick on under the hood when you turn it on. Can you hear and see it come on and start spinning the compressor?

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My 2001 Kia Spectra's ac just started giving me problems. I will be driving and the cold air stops blowing then it will start again. It's as if the compressor goes on and off. I did recharge it so when...


Note the diagram. With the ac on, vehicle in park, engine running, raise the hood, when problem is ongoing, is the compressor clutch engaged? Sometimes, you can tell. The top circle is ac relay. The bottom circle should be magnetic clutch/compressor. At the compressor clutch, top wire in diagram, I believe it is green and yellow, It should have voltage, use a test light to check. It appears to ground through compressor body. Voltage and grounds are important.
The compressor body won't get any voltage unless ac relay is energized. Top circle. The relay has two sides, load side and control side, The load side is that line with arrowhead, the control side is the right side, in the circle. You can see ac fuse above relay. The control side needs voltage and ground.
Another thought, temp door under the dash has a problem? Any applicable trouble codes?
ac-tfm0peltgux4vjyhbhjmnzyj-4-0.jpg

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open the hood listen to where the noise is comming from I suspect pullys shut off engine .Get a full can of wd40 spray one pully at a time start engine after spraying each pully when the noise quites down or goes away that will be the pully you will want to inspect further or replace before it leaves you stranded. I drive a 04 crown vic great car ps while your there check your serpintine belt. shouldnt be cracked or missing teeth. about 30 dollars at napa easy to replace.

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Temp. light comes on when driving, seems to go off when I turn off the air conditioning


There are two possible sources for this; the auxiliary fan is not turning on with the AC and/or the compressor load on the belt (if shared with the water pump) is causing it to slip causing the water pump to lose revs. and water flow.
Have someone turn on the AC while you watch under the hood. You should hear a 'click' as the AC compressor clutch engages and the extra fan should turn on.

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Is it the AC clutch? put the defrost on with engine running and open the hood. listen for the AC clutch switching on and off. this is normal. its basicly on the AC compressor.

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