Question about 2004 Saturn VUE

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If everything has power but no power to ac clutch is that a bad low press switch

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Could be. On some models the pressure switch sends a signal to the computer which grounds a relay to power the compressor clutch.
You would really need a wiring diagram for the system to see how the system is powered.

Posted on Jul 17, 2013

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94 accord ac not working. Jumped compressor off hot post on battery ac clutch came on and started cooling. Change ac fan relay and ac clutch relay. Did a by pass on the pressure switch. Nothing helps.


There are 2 pressure switches on it. High and low. Make sure you jumped the high switch. If so, the ECM could be bad. Check wiring first. Low refrigerant could be the problem also.

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A/C compressor on 95 astro van does not engage at all.


There are a few reasons for the compressor not engaging. Lets start with the most common. low ac gas.A bad clutch on the compressor.Blown fuse.
Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging.
If the compressor does not urn on then check all fuses, if fuses are good then the next step is to go to compressor and test for power and ground. If you have power and a good ground on the connector to compressor then compressor clutch is bad.A bad clutch will some times blown fuses, so if you replace the fuse because it was blown and it blows again then clutch is bad.
Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on,
Hope this helps let me know what the outcome is. Good day.
I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals

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This could be a few things. The freon could be low, one of the switches (high or low pressure) could be bad, or you could have a bad compressor clutch. You can test the clutch by checking for battery voltage and ground at the two pin connector with the A/C on if you have both power and ground, then the clutch is bad. You really should start by hooking up pressure gauges to the A/C ports to check the pressures, and these vary depending on ambient temperature and whether the A/C compressor is engaged or not. I am willing to bet that the freon is low though and may be just as simple as recharging the system.
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On the low pressure line of the ac you have a pressure switch which allows the compressor to come on once a certain pressure is reached, and it will cut the compressor off if the pressure is too high or too low. Look at your ac hose and find the switch *you will see wires connected to it* you may need to replace this switch. You can use a test light to see if you are getting power to the switch. You should check you fuses, and the ac relay witch is usually in a black plastic box under the hood.

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if your low on freon the unit will not work.low pressure switch cuts it off. or you have a bad a/c clutch asy.

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1 Answer

NO POWER TO AC COMP


Fuse #5 is for your ac.

On the Hi/Low pressure switch conection Terminal 1 and 2 are for AC clutch bridge them briefly to see if clutch engage if so system is low on refrigerent.

If you get cold air its more then likely Hi/Low switch is bad.

Note engine must be running and ac fan in on position.

Good luck

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