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B14 95-99 chassis 1995-1999 Sentra and 1995-1998 200SX

       
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Old Jun 20th, 2007, 03:19 AM   #1 (permalink)
ilikespeeding
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A/C blows hotter air than ambiant!

My A/C is stupidly horrible on my sentra. This thing actually has the nerve to blow hotter air at me than it is outside. I checked the low pressure side while running. It was right between the blue and yellow on the self charge gauge (right where it's supposed to be). If it has pressure, then I have no idea why I dont have cold. Having pressure means I have refridgerant. Maybe there is a slow leak and all of the refridgerant is dry? This is why neither of my mitsubishis have any A/C system.
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Old Jun 20th, 2007, 07:43 AM   #2 (permalink)
oliverr87
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having pressure doesn't mean you have refridgerant.
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Old Jun 20th, 2007, 03:16 PM   #3 (permalink)
ilikespeeding
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Quote:
Originally Posted by oliverr87
having pressure doesn't mean you have refridgerant.
...unless I have all oil...

That would be like having oil presure with no oil. I relieved the high pressure side with the car off and there was oil and I smelled refridgerant.
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Old Jun 21st, 2007, 11:15 AM   #4 (permalink)
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Quote:
Originally Posted by ilikespeeding
...unless I have all oil...

That would be like having oil pressure with no oil. I relieved the high pressure side with the car off and there was oil and I smelled refrigerant.
You need to get a better set of gauges with high and low side pressure reading.

You have checked the compressor is actually turning ?

But for now, what is the Low side pressure with A/C off, running at idle and running at say 3000 rpm.

Do you see the compressor disengage and re-engage, what pressure readings.

Also does it work at a higher speeds on the freeway for instance ?
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Old Jun 21st, 2007, 11:43 AM   #5 (permalink)
ilikespeeding
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Quote:
Originally Posted by IanH
You need to get a better set of gauges with high and low side pressure reading.

You have checked the compressor is actually turning ?

But for now, what is the Low side pressure with A/C off, running at idle and running at say 3000 rpm.

Do you see the compressor disengage and re-engage, what pressure readings.

Also does it work at a higher speeds on the freeway for instance ?
Actually. come to think of it, I dont hear clicks from it disengauging and enguaging. But, from the pulley, it's not locked up or anything.
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Old Jun 21st, 2007, 11:56 AM   #6 (permalink)
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Quote:
Originally Posted by ilikespeeding
Actually. come to think of it, I dont hear clicks from it disengauging and enguaging. But, from the pulley, it's not locked up or anything.
Ok the pulley turns, but does the clutch engage and turn the clutch plate (and compressor.)
If you don't have enough Freon pressure the clutch will not engage.
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Old Jun 21st, 2007, 03:05 PM   #7 (permalink)
ilikespeeding
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I thought it was electric?
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Old Jun 21st, 2007, 03:13 PM   #8 (permalink)
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Quote:
Originally Posted by ilikespeeding
I thought it was electric?
Not unless you have a Prius !!
The compressor is engine driven, and the clutch and controls are electric.
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Old Jun 22nd, 2007, 02:06 PM   #9 (permalink)
ilikespeeding
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Quote:
Originally Posted by IanH
Not unless you have a Prius !!
The compressor is engine driven, and the clutch and controls are electric.
I meant that I thought the clutch for the A/C was engauged by electic current. Since this car has had about 100,000 other things wrong electrically, Im going to see if there is current to the clutch.
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Last edited by ilikespeeding : Jun 22nd, 2007 at 02:12 PM.
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Old Jun 22nd, 2007, 06:00 PM   #10 (permalink)
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Quote:
Originally Posted by ilikespeeding
I meant that I thought the clutch for the A/C was engauged by electic current. Since this car has had about 100,000 other things wrong electrically, Im going to see if there is current to the clutch.
The clutch will NOT engage if the pressure is too low, or too high !!
So if the clutch plate and center axis of the compresor aren't turning locked to the pulley its safe to say there is no current to the clutch.
the first thing to do is to measure the pressure in pounds/ sq inch and record the temperature. In the FSM will be the specs for the low side switch. If there is enough to activate the clutch then go ahead and start the car and watch the gauges,
good luck...
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