Question about 1995 Ford Aerostar

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The air cond compressor not engaging, checked it out and there is no voltaged going to it from the switch,i can activate manualy with 12 volts however but still no cold air. Is there a relay between the switch and the compressor? All the fuses under the dash check out ok. This is a 4.0 engine. What is that small tank on top of the unit for? It has 4 wires going to it.

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The switch protects compressor from turning on when freon is low. add a charge and leak detector to system, thats why its not blowing cold when turned on manually

Posted on Apr 09, 2011

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Posted on Jan 02, 2017

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Subaru tribeca air conditioner not working


Check the power going to the compressor clutch with the AC switch on.If there is votage across the clutch, it may be bad. Not engaging.
If no voltage, you have test the circuit to see why no volts are there.

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Air cond. Compressor doesn't turn on Is there a separate switch?


Well yes, there is a separate switch. If the A/C system is low on freon, the low pressure switch will keep the compressor from engaging to save it from damage due to no lubrication. The freon helps with lubricating the compressor. Get you a can of 134a from the parts store and add a little to see if the compressor will come on. It should come on before one can is used. Now for the freon to be gone means you have a leak. So if the can gets you cooling, try to find the leak so you can stay cool.

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1 Answer

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check the HVAC relay under the hood for +12 volts if you have it here, then check the compressor clutch coil for +12 volts,then check the low pressure switch on the receiver on the passenger side of the engine compartment by jumping the switch and see if the compressor starts,then if you can hear the clutch engage and the compressor starts then you are low on R-134a refrigerant and need to find the leak or top it off with an a/c recharge kit,but be careful not to add too much refrigerant

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1 Answer

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Locate wires coming from compressor clutch and trace to nearest plug that you can unplug. Turn on A/C to max cooling. If clutch not engaged (center of compressor drive pulley not spinning with pulley), unplug compressor clutch wires and use multimeter to check voltage going to compressor clutch. If voltage is around 12 volts or more, then clutch should be engaged when plugged in. Plug clutch wires back in (with motor still running and ac set to max). If clutch still not engaged, then clutch definitely bad because 12V signal should engage it.

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1 Answer

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If your compressor is leaking oil it has most likely lost enough charge in the system that the low pressure switch has activated. This will keep the compressor from engaging. This is a safety override to keep you from ruining the compressor as the charge has lubrication oil in it and to run the compressor without it will ruin the compressor and contaminate the system which will require a complete flush and charge. Get a shop to fix the seal in the compressor and have the charge topped off and hopefully you will be good to go.

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1 Answer

Air cond dash light works, compressor doesn't go on.


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1 Answer

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You should check and make sure both the fuses aren't blown and the wires aren't showing serious signs of wear. I would be careful running bare wires from the battery to components, too. Today's cars have a lot of sensitive equipment in them that can be damaged.
Obviously it is not the A/C system itself, since you got it to run, which leads me to believe its something in the fuse box or in the wires. Sometimes there are a couple of different fuse boxes (one near the dashboard, and another under the hood somewhere). Also, some of the wires could be hard to check. I would use a multimeter if you have one, or borrow one from a friend (make sure you read the manual first). Use it to check and make sure the voltage is getting to the A/C compressor through the wire. Let me know what you find.

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1 Answer

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you can check for 12 volts going to the compressor when it is time for it to come on. this voltage passes through several switches along the way that could prevent it from coming on. the refrigerant is probably low and preventing the compressor from running

Jul 03, 2008 | 1995 Pontiac Bonneville

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