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

DuffMan · 08-25-2002, 12:52 PM

My question is do the vents have to redirect a certain way to get AC to work. My HVAC unit works okay except it wont turn on the AC no matter what i do. I kind of jumped the compressor clutch by manually wiring voltage to it, but it's not cold. My compressor very well may have no charge, but I'm wondering of there's something else i should look at.

gh6o6 · 08-25-2002, 05:44 PM

check to see if the idle jumps up when you turn it on.  If they do, then the compressor is working.  If you still dont get a cold air, buy a kit at an auto parts store to recharge it.  It will cost like $20 to do it rather than $100+ from someone else

DuffMan · 08-25-2002, 07:56 PM

Um, no offense but did you read my post? No the compressor wasn't turning on, but i jumped it on directly.

The question is whether the vents shift when you turn on AC, and could that explain why it wont blow cold?

gh6o6 · 08-25-2002, 08:56 PM

im not sure what you mean by shifting.  do you mean like you need to select feet/face/both/feet&def/defroster

either way, if the compressor is on it should be comming out cold somewhere, if not you need refrigerant

hope that helps

MarketPlayer · 08-25-2002, 10:03 PM

I heard a tech at work talking about the vent door not switching and that is why it wasn't blowing cold air.  So Nissan might have done something like Ford?

Broadwayblues · 08-26-2002, 05:19 AM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">If you still dont get a cold air, buy a kit at an auto parts store to recharge it.  It will cost like $20 to do it rather than $100+ from someone else</td></tr></table><span id='postcolor'>
I don't think that you will find a R-12 recharge kit, I am thinking that you are thinking of a 134A, and the older 240s don't have that.
I looked at the ac diagrams and I think that the cooling fins,or condensor, is in the airflow already.
I am going to have to replace my compressor, expansion valve, and dryer this week, I will look in there and see.

DuffMan · 08-26-2002, 02:57 PM

Thanks broadway. My car was made in november of 92 so I'm not sure if it's R12 or R134a. Any easy way to find out?

uiuc240 · 08-26-2002, 03:18 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (DuffMan @ Aug. 26 2002,3:57)</td></tr><tr><td id="QUOTE">Thanks broadway. My car was made in november of 92 so I'm not sure if it's R12 or R134a. Any easy way to find out?</td></tr></table><span id='postcolor'>
easiest way would be to look at the valves.  i don't know the difference myself, but the R134 valve is a different size than the R12 valve.  you are "supposed" to replace them when converting.  i think some shops have conversion valves that bypass this safety measure.  either way, you could probably buy a can of R134 and see if it matches up to your fittings.  if it doesn't you have R12.

sorry if that was a lame way to answer that problem.

you may be able to look at the sight glass and see if you have any refrigerant left...or if it has bubbles or something.  do you have an FSM?  i've never done any serious work with an A/C system...and now i don't have one anymore.

Eric

Broadwayblues · 08-28-2002, 06:18 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (DuffMan @ Aug. 26 2002,3:57)</td></tr><tr><td id="QUOTE">Thanks broadway. My car was made in november of 92 so I'm not sure if it's R12 or R134a. Any easy way to find out?</td></tr></table><span id='postcolor'>
i have the same year. it's r-12. sigh, i am really thinking of selling my car and buying a 2002 Maxima.  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt='

'>

08-26-2002, 05:19 AM	#6
Broadwayblues Zilvia Member Join Date: Apr 2002 Posts: 193 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">If you still dont get a cold air, buy a kit at an auto parts store to recharge it.  It will cost like $20 to do it rather than $100+ from someone else</td></tr></table><span id='postcolor'> I don't think that you will find a R-12 recharge kit, I am thinking that you are thinking of a 134A, and the older 240s don't have that. I looked at the ac diagrams and I think that the cooling fins,or condensor, is in the airflow already. I am going to have to replace my compressor, expansion valve, and dryer this week, I will look in there and see. __________________ "stop lights timed to 55 mph are also timed to 110 mph!" http://www.geocities.com/broadwayblues34/240sx.html 92 240SX Coupe! MB clear side markers Clear bumper lights 3 inch universal muffler w/ removable tip. Strut tower bar- Front OBX SS version 2

08-26-2002, 03:18 PM	#8
uiuc240 Nissanaholic! Join Date: Apr 2002 Location: Naperville, IL Age: 46 Posts: 2,093 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (DuffMan @ Aug. 26 2002,3:57)</td></tr><tr><td id="QUOTE">Thanks broadway. My car was made in november of 92 so I'm not sure if it's R12 or R134a. Any easy way to find out?</td></tr></table><span id='postcolor'> easiest way would be to look at the valves.  i don't know the difference myself, but the R134 valve is a different size than the R12 valve.  you are "supposed" to replace them when converting.  i think some shops have conversion valves that bypass this safety measure.  either way, you could probably buy a can of R134 and see if it matches up to your fittings.  if it doesn't you have R12. sorry if that was a lame way to answer that problem. you may be able to look at the sight glass and see if you have any refrigerant left...or if it has bubbles or something.  do you have an FSM?  i've never done any serious work with an A/C system...and now i don't have one anymore. Eric __________________ 2002 Mazda Protege5 1989 S13 w/SR20DET (sold)

08-28-2002, 06:18 PM	#9
Broadwayblues Zilvia Member Join Date: Apr 2002 Posts: 193 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (DuffMan @ Aug. 26 2002,3:57)</td></tr><tr><td id="QUOTE">Thanks broadway. My car was made in november of 92 so I'm not sure if it's R12 or R134a. Any easy way to find out?</td></tr></table><span id='postcolor'> i have the same year. it's r-12. sigh, i am really thinking of selling my car and buying a 2002 Maxima.  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=''> __________________ "stop lights timed to 55 mph are also timed to 110 mph!" http://www.geocities.com/broadwayblues34/240sx.html 92 240SX Coupe! MB clear side markers Clear bumper lights 3 inch universal muffler w/ removable tip. Strut tower bar- Front OBX SS version 2

08-25-2002, 12:52 PM	#1
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	My question is do the vents have to redirect a certain way to get AC to work. My HVAC unit works okay except it wont turn on the AC no matter what i do. I kind of jumped the compressor clutch by manually wiring voltage to it, but it's not cold. My compressor very well may have no charge, but I'm wondering of there's something else i should look at.

08-25-2002, 05:44 PM	#2
gh6o6 Zilvia Junkie Join Date: Oct 2001 Location: Dirty Jersey Posts: 550 Trader Rating: (0) Feedback Score: 0 reviews	check to see if the idle jumps up when you turn it on.  If they do, then the compressor is working.  If you still dont get a cold air, buy a kit at an auto parts store to recharge it.  It will cost like $20 to do it rather than $100+ from someone else

08-25-2002, 07:56 PM	#3
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	Um, no offense but did you read my post? No the compressor wasn't turning on, but i jumped it on directly. The question is whether the vents shift when you turn on AC, and could that explain why it wont blow cold?

08-25-2002, 08:56 PM	#4
gh6o6 Zilvia Junkie Join Date: Oct 2001 Location: Dirty Jersey Posts: 550 Trader Rating: (0) Feedback Score: 0 reviews	im not sure what you mean by shifting.  do you mean like you need to select feet/face/both/feet&def/defroster either way, if the compressor is on it should be comming out cold somewhere, if not you need refrigerant hope that helps

08-25-2002, 10:03 PM	#5
MarketPlayer Zilvia Member Join Date: Mar 2002 Posts: 251 Trader Rating: (0) Feedback Score: 0 reviews	I heard a tech at work talking about the vent door not switching and that is why it wasn't blowing cold air.  So Nissan might have done something like Ford?

08-26-2002, 02:57 PM	#7
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	Thanks broadway. My car was made in november of 92 so I'm not sure if it's R12 or R134a. Any easy way to find out?