Question about 2005 Nissan Altima

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If the ac compressor clutch gives was can this make the engine stop?

If the ac compressor clutch gives way can this kill the engine?

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If the bearing for the belt pulley on the compressor seizes, the engine can quit and even appear to be seized as well. Remove the a/c belt and try to start the engine.

Posted on Jun 02, 2009

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Charge a/c 2.50 134a replaced low psi.switch still low psi switch shuts off com.low gauge showes 23 to27psi


Dis you evacuate all the air before charging the system? What is the high pressure side reading? How long does it take for the compressor to shut off? Have you checked the TPS? Maybe the computer is been told the engine is at 60% throttle which kills the compressor clutch for more power, have you replace the AC clutch relay?. I don't know lots of reasons for this.

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Compressor clutch not engaging


To locate the relay follow the wire from the clutch and you will find it. Do the engine fans come on when you turn on the AC? If they don't then you either have a bad thermostat (located by the evaporator) under the glove box or your AC system could be overcharged. There is a high pressure switch that will kill the compressor if it goes over 300 psi. If it comes on momentarily then shuts off it is probably overcharged.

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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.

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I have a nissan sentra 1996. As per checking the ac compressor has stacked up, is there a connection between the ac and the engine because the car engine stops when i started it, there is a slight...


There is a clutch between the compressor and the engine that turns the compressor over. Although unlikely, if the compressor has completely seized then when the compressor clutch engages it will stall your engine.

Your car should have an aircon on/off button. Turn your car on and immediately switch off the aircon, if the compressor clutch is at fault it should stay disengaged and you should be able to use the engine.

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Compressor and fans do not turn on until rev engine


I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

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My a/c compressor is only blowing hot air when I turn it on. I know a little about cars so I know it's the a/c but I am not able to find one on any site that may sell used or new.


If all you get is hot air there are several possibilities. The compressor is driven by the serpentine belt and is engaged and disengaged by an electric clutch mounted on the compressor drive pulley. With the engine running, have an assistant turn on the AC while you observe the AC compressor clutch. If the clutch engages, you can be reasonably sure that the system has freon, and the electric circuit is OK. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). A search of Google images will give you the location of the AC relay. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. Warning: do this only for a second or two in order to see the clutch engage. If the clutch does engage, then you are probably low on freon. There is a safety switch that prevents the clutch from operating if there is not enough freon in the system. Hopefully, this is the case. Go to Walmart and get two cans of r-134 and the inexpensive kit, and following their instructions, charge your system. If this is not the problem, you'll need a set of AC gauges and the skill to use them. Hope this helps. Dano

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Find the AC compressor. The pulley on it has an electric clutch that allows the compressor to run when the AC is on and not when it is off. With the engine running you should be able to see if the clutch is turning or not. The pulley turns all the time the engine is running only the clutch behind the pulley starts and stops. Look at the pulley with the AC off. Have someone turn it on and see if the clutch engages to turn the compressor. If it doesn't engage there are a couple thing that could be wrong. First the clutch has burned out and no longer works. The fuse on the AC clutch is blown. Check the fuse. More likely, if the cold air has been getting warmer, the AC system has a refrigerant leak. The system has a low pressure switch that prevents the clutch from engaging when the refrigerant pressure is too low. If the fuse is good then you need to have a qualified AC Technician check the system.

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2004 chevy blazer ac stoped working and if the ac is turned on it stoped the engine abruptly, the pressure on the low pressure port without the engine on reads high at 150psi which is the red danger zone...


I would suspect you have a bad A/C compressor. When you engage the A/C, the clutch locks up the pulley which kills your motor from the drag on the belt. Replace the compressor, evaporator and valve, then recharge system to 55 psi.

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