Question about 1996 Nissan Altima
I have a 1996 nissan altima the ac clutch engages when car is cool. it has the correct freon charge. the ac blows cold then disengages about 10 min later and doesnt cycle again untill I turn the engine off and let it cool back down for a little while, then it does the same thing again. I have changed the high pressure switch IT DID NOT WORK. what other things could it be ?
Nissan came out with a Technical service bulletin on problem evaporators which caused the freon to flow from the expansion valve to the low side hose without going through the heat exchanger portion of the evaporator core it self. It can be spotted by the low side pipe from the compressor which may develop a "frost" on it. What occurs, is that the low side freezes up and has to thaw out before it will cool again.
NTB97-007a was the service bulletin.
Issued on January 15, 1998
Heading: A/C poor performance, suction side shows low or vacuum.
I feel pretty sure this is your problem. It can be verified with a set of manifold guages. The low side after it has been charged, should never drop into a vacuum and rarely drop below 20 psi. no matter how long you run the system.
The only way the problem can be solved is replace the evaporator.
Posted on Apr 06, 2009
Low freon switch is preventing the compressor clutch from engaging . If it's getting cooler .in your area sometimes the freon will condense just enough to trigger that switch if it's already low. The newer systems have both a low and high limit switch,, if you can use a meter it's very easy to determine what is keeping the clutch off. My advice to you is don't touch anything because your close to getting into serious trouble IMO -Your system is greatly overcharged and if that clutch energized you would do damage to your compressor. You can get A/C Clutch equipment for Nissan or any other cars from various automotive dealers. For your car safety you shouldn't buy cheap a/c clutch tools. Likewise Techpro Tools offers high quality A/C Clutch Service Set.
Posted on May 12, 2016
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.
Posted on Jul 14, 2009
That clutch and coil are serviceable without replacing the compressor but I have had little success with this as usually the clutch gets in that shape subsequently from activity going on inside the compressor which means that clutch is failed generally for a reason.replace the compressor -orfice tube-reciever drier and happy motoring......
Posted on Jul 18, 2009
it could be a conscience that the wipers stopped too, because elctricly these are not sharing any resources.
there may be a leak in the system. when the freon gets low there is a pressure switch that disables the clutch to prevent damage.
Posted on Mar 30, 2010
SOURCE: ac was working fine the
Check the low switch by the dryer or accumulator, its a long narrow cannister,
it will have a pressure switch attached to it or near it. put your, ac on high,
pull the molex off the switch and jump the molex with a wire or paperclip,
if the compressor comes on and the ac starts to cool, you will just need
to replace the low pressure switch, if the clutch does not come on,
check the low switch molex to see if there is 12vlts there. good luck!
Posted on Jun 28, 2011
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