A/C Problem

schutz86 · 07-15-2008, 08:17 PM

ok so i just converted my R-12 to the R-134a or whatever it is. i pumped all the R-12 refrigerant out of the lines for 45 minutes. then i put the new fittings on and charged it with the new refriderant. it works. but only for a little bit. like it will come on for a few minutes then the compressor kicks off for a few minutes and the air gets warm. then it will kick back on and get cool again. does anyone know how much refriderant should be in there. i think i might have just slightly too much or too little. i put 2 12oz cans in.

Chambers · 07-16-2008, 02:30 AM

Sounds like the compressor needs some more oil, get a small can of oil for your system and give that a try.

Good luck.

OfnaRcR · 07-17-2008, 02:11 PM

Quote:

Originally Posted by Chambers

Sounds like the compressor needs some more oil, get a small can of oil for your system and give that a try.

Good luck.

Is there some kind of AC oil level sensor that kicks off the compressor that i haven't heard about??

As for the origional question, how cold does it get? It could be overcharged/undercharged.

Chambers · 07-17-2008, 04:00 PM

Yea, there is a sensor in all AC systems that senses the level of oil, if its to low it will either not let the compressor spin or it will kick it on/off.

Sorry I have no deffinative answer for you about the temp, when my compressor was working it would blow ice cold air almost instantly after turning it on.

Good luck.

CyFi6 · 07-17-2008, 05:42 PM

You should really hook up a gauge set so you can determine your problem further.

schutz86 · 07-18-2008, 07:40 PM

whenever the compressor is working the air is cool but not really cold. so im thinking maybe undercharged? if i hook up a gauge to it how much pressure should it be at?

mrnickleye · 07-18-2008, 10:06 PM

All of the above answers are INCORRECT. This is why I will stress again (its been awhile) NOT to just go out follow some stranger's advice.

And DO NOT offer GUESSES to answer a question you are NOT QUALIFIED to answer.

In other words, don't give advice on repairs you have no clue about.

Just read the thread, and wait for someone that KNOWS what GOOD advice to give posts.

There are several QUALIFIED TECHICIANS on this site (like myself) that will get to you.

mrnickleye · 07-18-2008, 10:11 PM

I will now suggest (because I'm sick with a UTI, and don't want to go into detail myself)
that you google r12 to r134 conversion procedures.

**And NO, there is no 'oil level' sensor or indicator in an a/c system.

Chambers · 07-18-2008, 11:49 PM

Quote:

Originally Posted by mrnickleye

**And NO, there is no 'oil level' sensor or indicator in an a/c system.

Well you may be right, but from my experiences on my system the AC compressor did not kick on until I had put some oil in the system.

I do say I'm sorry to give miss info.

mrnickleye · 07-20-2008, 06:08 PM

2 sensors on highside line along right framerail (near exhuast manifold).

One is to shut OFF compressor when pressure gets too high.
Other is to turn ON the ac electric fans.

R134a runs higher pressures. When MINE was r134, I had to unplug the sensor and put a jumper in the connector.

r134 should be 15% less volume than r12, to help on this.

about 1lb 4oz r134

07-15-2008, 08:17 PM	#1
schutz86 Stock Join Date: Jul 2008 Location: Pittsburgh Posts: 7	A/C Problem ok so i just converted my R-12 to the R-134a or whatever it is. i pumped all the R-12 refrigerant out of the lines for 45 minutes. then i put the new fittings on and charged it with the new refriderant. it works. but only for a little bit. like it will come on for a few minutes then the compressor kicks off for a few minutes and the air gets warm. then it will kick back on and get cool again. does anyone know how much refriderant should be in there. i think i might have just slightly too much or too little. i put 2 12oz cans in.

07-16-2008, 02:30 AM	#2
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Sounds like the compressor needs some more oil, get a small can of oil for your system and give that a try. Good luck. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

07-17-2008, 04:00 PM	#4
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Yea, there is a sensor in all AC systems that senses the level of oil, if its to low it will either not let the compressor spin or it will kick it on/off. Sorry I have no deffinative answer for you about the temp, when my compressor was working it would blow ice cold air almost instantly after turning it on. Good luck. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

07-18-2008, 10:06 PM	#7
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Forum replies NOT always sound advice All of the above answers are INCORRECT. This is why I will stress again (its been awhile) NOT to just go out follow some stranger's advice. And DO NOT offer GUESSES to answer a question you are NOT QUALIFIED to answer. In other words, don't give advice on repairs you have no clue about. Just read the thread, and wait for someone that KNOWS what GOOD advice to give posts. There are several QUALIFIED TECHICIANS on this site (like myself) that will get to you. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

07-18-2008, 10:11 PM	#8
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Research BEFORE that work begins I will now suggest (because I'm sick with a UTI, and don't want to go into detail myself) that you google r12 to r134 conversion procedures. **And NO, there is no 'oil level' sensor or indicator in an a/c system. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

07-17-2008, 05:42 PM	#5
CyFi6 3" Exhaust Join Date: Oct 2007 Location: SLO Posts: 234	You should really hook up a gauge set so you can determine your problem further.

07-18-2008, 07:40 PM	#6
schutz86 Stock Join Date: Jul 2008 Location: Pittsburgh Posts: 7	whenever the compressor is working the air is cool but not really cold. so im thinking maybe undercharged? if i hook up a gauge to it how much pressure should it be at?

07-20-2008, 06:08 PM	#10
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	2 sensors on highside line along right framerail (near exhuast manifold). One is to shut OFF compressor when pressure gets too high. Other is to turn ON the ac electric fans. R134a runs higher pressures. When MINE was r134, I had to unplug the sensor and put a jumper in the connector. r134 should be 15% less volume than r12, to help on this. about 1lb 4oz r134 __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

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