Question about 1998 Nissan Altima

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1998 Nissan Altima -Trying to check and see if the clutch on the compressor is or isn't kicking on. On my GMC the pressure switch on the Accumulator is 2 wire and easy to bypass. The Nissan has 4 wires, can I bypass it? R134A is at correct level. Have A/C set on MAX A/C but compressor isn't starting.

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Using a power probe or a test light, you have to check to see if you have power running to the clutch first. If yes, then the wire to the clutch is usually grounded to the compressor itself, so you find it by working backwards from the ground. Hope this helps.

Posted on Aug 01, 2009

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ADD Freon. It's a R134 system and the pressure is too low. Trust me add Freon and it will work fine. With a low amount of Freon if you jump the low pressure switch at the accumulator it will be very cold but will not have enough pressure to kick on the low pressure switch.

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1 Answer

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The accumulator or dryer looks like a long cylinder, it has a pressure switch on it and two wires attached to it. pull the wired molex off, with the ac set on max cooling, jump out the two wires with a wire or paperclip, if the clutch on the ac compressor engages, check the cab to see if its cooling, if it does cool the switch needs to be replaced, if it does not cool, you may need freon, and there could be a sign of a leak in your system, that can be best checked with ac manifold guages. the low pressure switch is there for safety if the canistor or accumulator is low or has no freon the switch opens up and keeps the clutch from running so that the compressor will not burn up. good luck!

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I have a 1998 chevy cavalier, I was driing and the AC was working. I stopped and when I started teh car again a couple hours latter the AC was not working. The fuses are good and the comressor and dryer...


Did you check the AC relay? Usually located under the hood, try swapping it with another relay with the same part number that isn't required to run the vehicle. If the AC now works, then replace the relay. If not , then verify compressor operation. With the engine running, watch the compressor clutch while someone else turns on the AC control. The clutch should engage and begin to run. If not, then find the pressure cycling switch usually located on the accumulator. Disconnect the harness and jumper the contacts. With the engine off and the key turned on , turn the AC control on. You should now be able to watch the clutch engage and disengage by removing and replacing the jumper lead. If it does, then replace the switch. I hope this information is helpful. Thanks for trying Fixya.

Jul 04, 2011 | 1998 Chevrolet Cavalier

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I have installed a new accumulator, evaporator, condenser , expansion tube and compressor in my 1999 chevy monte carlo. i put 9 0zs. refrigerant oil between the compresser and the accumulator. i also...


Is the pressure detection switch engaged? It detects pressure in the cooling system. This switch shuts down the clutch to prevent the compressor to run when there's a leak.

Sometimes there's a looking glass on the expansion bottle showing tiny bubles. A large blob of air indicates too much air in the system. Pressure might not be enough to engage the switch when there's too much air left.

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I just installed a new a/c compressor clutch I put the correct r-134 I put new hoses a new condenssor and accumulator . My problem is I cannot get the clutch to kick in unless I run jumpers to the...


you may have a few different problems including a defective pressure switch

when you added the "correct R-134" did you also add oil?

replacing that many parts requires additional oil

Therefore, you may not have enough "pressure"

do you have a/c gauges?
did you evac the system for at least an hour after replacing the parts?

Sean

Aug 25, 2010 | 1995 GMC Sonoma

1 Answer

Ac compressor will not engage when ac is on. System seems to be full of gas. Quit without warning. This is on a 2003 Nissan Altima with 2.5L. Secondary fan does come on when AC is switched on.


Check A/C compressor relay. When you say it seems to be full of gas(freon) have you actually put a pressure gauge on the system? If the pressure is too low, the compressor will not engage. If the compressor relay is functioning, check for power at the compressor clutch. If it has power to it and it still is not engaging, the A/C clutch may need replacing. It is usually almost as economical to replace the complete compressor with clutch installed than to just purchase a clutch. Keep in mind if you replace the compressor you should also replace the receiver/dryer also referred to as the accumulator.

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the system has a definite leak and should be fixed then the system should be recharged there is a pressure switch that keeps the clutch from engaging when the system is low on freon which keeps from burning up the compressor

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