The AC was working fine and then all of a sudden the AC quit. When I turn the AC on, there is no click or engine rpm change. The compressor/clutch never tries to engage. I suspect a blow fuse, but cannot find the fuse location. I read somewhere online that the AC engine fuse was behind the glove box, however I have removed the glove box and still cannot find the fuse. Does anyone know where the AC engine fuse is located on a 1996 Buick Century, 3.1L V6.
Take the glove box out. Behind the fuse box you will find a big gob of black tape, (it looks like a box shape all taped up. Take the tape off and you will find three inline fuse holders taped together. The AC fuse is the 10 amp one.
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How long since spark plugs changed?
air conditioner works well? Maybe compressor going bad causing excessive load on engine bad electric clutch on compressor drawing down charging system .
battery condition? 13.6v DC or more
Can you provide more details, type of vehicle, only acts up with a/c on, if you turn a/c off and turn the defrost on, sometimes the manufacturer will have the a/c compressor cycle, does the vehicle still act up?
The basic concept is that in auto or defrost the air conditioner compressor is activated.
The compressor when activated via an electrical clutch adds an additional load that will reduce the engine RPM. The the RPM is increased slightly when the A/C is activated to prevent the engine from stalling. Power produced by the engine is increased by allowing more air and gas into the engine. When it is working perfectly the RPM will remain the same but the engine will produce the additional power to power the AC compressor.
Usually the bi-pass air valve is how the compensation for the additional power is accomplished.
Depending on your make year and model several methods to achieve the AC compensations have been used. In your specific case if the compressor is not working(no Air) and the compensation is open loop no engine control electronics I would expect a surge in RPM. With no additional load from the AC the additional air into the engine would increase the RPM.
On older cars there is a solenoid that has an adjustment for idle speed when the solenoid is activated. See the image above.
Hope this helps?
Knowing make model and year would help. Most newer vehicles, 2000 and newer, will adjust the idle control up to compensate for the compressor engaging. Possible there is an issue in the idle air control valve or electrical circuit.
Have an AC repair shop hook up a set of AC pressure gauges while this is happening to see what is going on. You could have a defective AC compressor or a low refrigerant charge in the system. And as to the hot weather causing it to act up that would be normal, the AC would cool fine the cooler the outside air is, problems like worn out compressors and low system refrigerant charge levels would only show there ugly head in hot weather conditions. Also make sure the cooling fans fo rthe AC and engine are working properly. Good luck with this.
Possible damaged A/C compressor locking up. Could also be a faulty Idle Air Control (IAC). It is supposed to kick up the engine RPM when the A/C is turned on. If it is not working properly, you will feel the engine bog down a lot when the compressor clutch engages.
I recommend listening to the pump with a mechanic's stethescope to see if the noise you are hearing is coming from the compressor.
You have to start by testing the pressure in the system. If it was cycling a lot and then quit it sounds like you developed a leak somewhere and once it fell below the low pressure switch it will not come on.
The system works with a high and low pressure switch that will cut out if the pressure is too high or low. When the system looses pressure it will fall below the low while running, turning off the compressor, When the compressor is off the high side and low side equalize out bringing the stationary pressure above the low limit, turning the system on again. This cycle will repeat until there is not enough pressure when equalized to turn the system back on.
If the pressure is good, go next to the relay, it should be located on the fire wall. if the relay is right, then you need to determine if it is high or low pressure switch shutting it off. IF it is the high, you probably have a restriction in the system, You could also have a problem with the compressor. With the car not running manually turn the clutch and see how much play, smell the area and smell if there is a burnt odor, then try to turn the armature that goes into the compressor. see if it is frozen.
there are few problem with the A/C cooling system better check for A/C unit fuse weather it is blown or in good condition, check for the proper working of A/C condencer unit fan motor assembly for proper working, check for weather their is no lick of gas any where in the entire A/C unit complete system or more problem better consult or take the vehicle to nearest Hyundai authorised workshop or better take it to a well knon or experiencied person who had done this sort of problematic work.