AC help needed! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Gjohnson7 · 07-16-2008, 10:06 PM

Ok, guys I need some help with my AC I can't figure out what the problem is. The car is a 93 coupe with stock KA, the AC has already been converted over to R 134 and I charged the AC system last week with my neighbor, but the air still doesn't blow cold.

Before we charged the system, we hooked up a vacuum and vacuumed out the system for almost 2 hours. After the system was completely vacuumed out, we checked the system for leaks and it was air tight. We proceeded to empty 3 12 ounce cans of R 134 into the system and the AC still blows warm air. The compressor kicks on and draws the refrigarant, but the lines don't even get cold like they should. What should I check? Any ideas on what could be wrong?

projectRDM · 07-16-2008, 11:22 PM

Expansion valve could be bad. Did you replace the drier while the system was open?

Gjohnson7 · 07-17-2008, 06:53 AM

No, I didn't replace anything. How can you test the expansion valve to make sure its faulty.

Sileighty_85 · 07-17-2008, 07:06 AM

Damn I just had the same exact problem
Mine was running perfect after installing another electric fan then started doing the exact same thing

At first I thought it was my Thermo Contorl Amp cuz the plug for the terminal board had broken solder points,
I repaired it-Didnt work, replaced it- Didnt work

I suspected the expansion valve but i wasnt sure.

mifesto · 07-17-2008, 09:18 AM

drier when exposed to air for long durations can go bad

Sileighty_85 · 07-17-2008, 12:27 PM

Quote:

Originally Posted by mifesto

drier when exposed to air for long durations can go bad

okaaayyyyy........ Thanks.....?

silpena · 07-17-2008, 04:46 PM

plus one for the drier, its probley full of moisture or the desicant in it could have exploded. If thats the case then i would flush it out and put a filter in it. It can clog up ur orfice tube.

boostin13b · 07-18-2008, 06:14 AM

You really need to hook it up to some gauges to see what your pressures are doing in order to correctly diagnose your problem. Without knowning what your pressures are doing all you can do is replace parts one by one.

Skids2212 · 07-19-2008, 02:34 AM

also check your condenser fan, if thats not working your AC will blow warm especially at idle

07-16-2008, 10:06 PM	#1
Gjohnson7 Zilvia Addict Join Date: Mar 2004 Location: Broken Arrow, OK Age: 40 Posts: 980 Trader Rating: (7) Feedback Score: 7 reviews	AC help needed! Ok, guys I need some help with my AC I can't figure out what the problem is. The car is a 93 coupe with stock KA, the AC has already been converted over to R 134 and I charged the AC system last week with my neighbor, but the air still doesn't blow cold. Before we charged the system, we hooked up a vacuum and vacuumed out the system for almost 2 hours. After the system was completely vacuumed out, we checked the system for leaks and it was air tight. We proceeded to empty 3 12 ounce cans of R 134 into the system and the AC still blows warm air. The compressor kicks on and draws the refrigarant, but the lines don't even get cold like they should. What should I check? Any ideas on what could be wrong? __________________ LSX Kouki Project, swap completed in Dec 09

07-16-2008, 11:22 PM	#2
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Expansion valve could be bad. Did you replace the drier while the system was open? __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

07-17-2008, 06:53 AM	#3
Gjohnson7 Zilvia Addict Join Date: Mar 2004 Location: Broken Arrow, OK Age: 40 Posts: 980 Trader Rating: (7) Feedback Score: 7 reviews	No, I didn't replace anything. How can you test the expansion valve to make sure its faulty. __________________ LSX Kouki Project, swap completed in Dec 09

07-17-2008, 07:06 AM	#4
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Damn I just had the same exact problem Mine was running perfect after installing another electric fan then started doing the exact same thing At first I thought it was my Thermo Contorl Amp cuz the plug for the terminal board had broken solder points, I repaired it-Didnt work, replaced it- Didnt work I suspected the expansion valve but i wasnt sure. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit Last edited by Sileighty_85; 07-17-2008 at 07:43 AM..

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07-17-2008, 09:18 AM	#5
mifesto Zilvia Member Join Date: Jul 2007 Location: NJ Posts: 209 Trader Rating: (2) Feedback Score: 2 reviews	drier when exposed to air for long durations can go bad

07-17-2008, 04:46 PM	#7
silpena Zilvia Addict Join Date: Jan 2008 Location: LIVE OAK,CA Age: 34 Posts: 834 Trader Rating: (2) Feedback Score: 2 reviews	plus one for the drier, its probley full of moisture or the desicant in it could have exploded. If thats the case then i would flush it out and put a filter in it. It can clog up ur orfice tube.

07-18-2008, 06:14 AM	#8
boostin13b Leaky Injector Join Date: Feb 2004 Location: Tampa Posts: 121 Trader Rating: (0) Feedback Score: 0 reviews	You really need to hook it up to some gauges to see what your pressures are doing in order to correctly diagnose your problem. Without knowning what your pressures are doing all you can do is replace parts one by one.

07-19-2008, 02:34 AM	#9
Skids2212 Join Date: Nov 2006 Location: Tacoma, WA Age: 32 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	also check your condenser fan, if thats not working your AC will blow warm especially at idle