Any ProCharger A4 guys having issues with A/C at idle?
08-06-2009, 06:48 PM
#1
Any ProCharger A4 guys having issues with A/C at idle? My A/C will simply not blow cold at idle, it is fine at anything above 1500 RPM's, but at idle it is warm, like the compressor just isn't on. I've already replaced the compressor and I don't know what else to do. Anybody have any ideas? I'm assuming a 3.4 on the blower is some strain on the accessories and something is killing the compressor under strain, I just don't know what to look for? Mechanical Gurus, Tuning Gurus, any help would rock!
DISCLAIMER: I posted this in FI because I think it is related to the blower and strain.
DISCLAIMER: I posted this in FI because I think it is related to the blower and strain.
08-06-2009, 08:20 PM
#3
TECH Junkie
iTrader: (13)
Join Date: Sep 2004
Location: Fort Myers, FL.
Posts: 3,857
Likes: 0
Received 0 Likes
on
0 Posts
do you have a underdrive pully on the car? My N/A car does the same thing but it is from my 25% underdrive pulley. I know most don't put a underdrive pulley on with a procharger, but they do sell them and could be your problem.
BOSS APPROVED!
Trending Topics
08-07-2009, 09:26 PM
#8
10 Second Club
iTrader: (4)
Join Date: Feb 2004
Location: Marysville, WA
Posts: 9,448
Likes: 0
Received 0 Likes
on
0 Posts
I'd bet it's from the cam/stall/blower combo. All the surging you get at idle drives the PCM nuts. It only stands to reason that either the PCM disables the AC at idle, or it just says F this, I aint got enough coolant flowing on a regular basis. Not sure how sophisticated these computer cars are for stuff like that, but they could easily write that code.
Sorry, I tore my AC unit out so I can't go compare & look at stuff.
Sorry, I tore my AC unit out so I can't go compare & look at stuff.
08-08-2009, 05:49 AM
#10
The system in our cars is a VDOT, the computer doesn't look at flow. The compressor changes displacement based on high side pressure (using hydraulics....a pilot valve).
If the underhood temps are pretty high and rpm is pretty low, then the compressor will probably run at max displacement and still not meet the high side pressure needs.
A set of manifold gauges will tell much.
If the underhood temps are pretty high and rpm is pretty low, then the compressor will probably run at max displacement and still not meet the high side pressure needs.
A set of manifold gauges will tell much.
08-08-2009, 04:24 PM
#11
The system in our cars is a VDOT, the computer doesn't look at flow. The compressor changes displacement based on high side pressure (using hydraulics....a pilot valve).
If the underhood temps are pretty high and rpm is pretty low, then the compressor will probably run at max displacement and still not meet the high side pressure needs.
A set of manifold gauges will tell much.
If the underhood temps are pretty high and rpm is pretty low, then the compressor will probably run at max displacement and still not meet the high side pressure needs.
A set of manifold gauges will tell much.
08-08-2009, 04:34 PM
#12
TECH Regular
iTrader: (38)
Join Date: Sep 2008
Location: edmond, ok
Posts: 498
Likes: 0
Received 0 Likes
on
0 Posts
Its just a set of gauges that show you suction and discharge pressure, they looks the same as gauges for your home AC ect. It is a way to check if you have a proper charge on your system. I am sure whoever installed your compressor and charged the system has a set.
08-10-2009, 12:51 AM
#13
TECH Apprentice
iTrader: (4)
Join Date: Apr 2007
Location: KC
Posts: 320
Likes: 0
Received 0 Likes
on
0 Posts
My ac killed my car twice today, was trying to make a light and braked real hard. The second time I was stopped at a stop sign I just rolled up and stopped real slow. IDK WTF but it sucks and I'm tired of it.
08-10-2009, 01:03 AM
#14
It has nothing to do with the blower. Most likely its because of the lack of airflow through the condensor. Have you verified that the compressor is running during the rpm ranges you say its blowing warm? If not, it may be low on refrigerant. If it is, its most likely airflow, probably because the ATI fan setup isn't that good.
08-10-2009, 04:41 AM
#15
The first thing (if you haven't already) I would do is to do a really good job of cleaning the condensor, as they tend to get a build up of bugs, road debris, etc on our cars. This can make a very dramatic difference in the cooling efficiency. Bob
08-17-2009, 12:22 AM
#16
I removed the condenser, cleaned it out completely at a high pressure car wash, degreased it, and there is also a pusher fan on it now to help keep the motor cool, no change. Any other input would rock! Thanks for the help thus far.
