1997 Honda Civic noise

Tiny
JOVANRODRIGUEZ
  • MEMBER
  • 1997 HONDA CIVIC
  • 1.8L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
I recedly added frion for the ac to work after 2 weeks it starting making a cranky noise since I had the ac on but when I diidnt use it it never made a sound now that I have the ac on it makes a noise sounds like the back if the motor or something need help?
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Wednesday, June 24th, 2015 AT 9:04 PM

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Tiny
CARADIODOC
  • EXPERT
Please use some punctuation so I read this correctly.

How much refrigerant did you add, and how did you know how much to add?
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Wednesday, June 24th, 2015 AT 9:27 PM
Tiny
JOVANRODRIGUEZ
  • MEMBER
The mechanic said the bottles might be enouph so he added the little cans of frion that my car supposedly neede to stay at 30 to 35 psi and he measured it and it didnt go up! So what could be the problem?
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Wednesday, June 24th, 2015 AT 9:31 PM
Tiny
CARADIODOC
  • EXPERT
I'm not following that. Nothing in the AC system should be 35 pounds or 35 degrees. I don't know what "it" is, but if you're saying the high-side pressure didn't go up to around 150 psi, that would suggest the compressor has failed.

One common cause of a failed compressor is adding too much refrigerant. A home refrigerator will be damaged by adding just two ounces too much refrigerant. Car systems are much more forgiving because they are going to be bouncing around and tipping various ways. Still, too much refrigerant will cause a couple of problems. First, liquid refrigerant boils and turns into a vapor. Where that occurs is where it gets real cold, and you want that to be in the evaporator in the dash. When there's too much in the system, it vaporizes too late when it's on its way out to the compressor. The "cold" is made under the hood instead of inside the car. Second, that liquid can slosh into the compressor, and since liquids can't be compressed, something has to give. If you're lucky, the compressor will just lock up and you'll have a horrendous belt squeal, or the clutch will burn up. If you're not lucky, the pistons in the compressor will be damaged.

The only way to know if the right amount of refrigerant is in the system is to recover all of what is in there now, then pump in the exact measured amount called for.
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Wednesday, June 24th, 2015 AT 11:57 PM
Tiny
JOVANRODRIGUEZ
  • MEMBER
So that could cause the cranking on buy the engine
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Thursday, June 25th, 2015 AT 4:25 AM
Tiny
CARADIODOC
  • EXPERT
I'm not sure what you're asking. If there is a noise with the air conditioning running, turn the AC off and see if the noise is still there. If it's not, look closely at the AC compressor and belt. You're going to have to determine where the noise is coming from, or which part is doing it.
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Thursday, June 25th, 2015 AT 8:03 PM
Tiny
JOVANRODRIGUEZ
  • MEMBER
Okay thanks :)
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Thursday, June 25th, 2015 AT 8:10 PM

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