| | AC cooling insufficient |  |
|
|
| Author | Message |
|---|
Jason
Aficionado
Name : Jason
Age : 41
Location : Comox, BC, Canada
Joined : 2007-01-23
Post Count : 1378
Merit : 66
| | Subject: AC cooling insufficient Wed Jun 08, 2011 6:04 pm | |
| I topped off Mel's white riv today and brought the AC back down to a nice cold temp. It didn't take the whole can so I figured I'd top off the green riv, but I wasn't so lucky.
The refrigerant level was at the lower threshold and blowing hot. I tried to add a can of R134 by opening the valve with the engine at 2000 rpm (Procedure from other service manuals, but there's nothing in ours). The can didn't seem to want to flow into the car. The can got cold, but still weighed the same afterwards. Oddly enough, the compressor was on 100%, not cycling on and off. Any idea what would cause this ? I tried to follow the diagnostics in the FSM, but it doesn't seem clearly defined.
We put the remainder of the can in my friends' caprice using the same procedure with no issue. It took the whole can, so I think we can rule out the can itself.
Last edited by Jason on Fri Jun 10, 2011 8:50 am; edited 1 time in total | |
|
| | |
AA
Administrator
Name : Aaron
Age : 47
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18452
Merit : 252
| | Subject: Re: AC cooling insufficient Wed Jun 08, 2011 8:54 pm | |
| How did you verify the refrigerant level? Did you verify it again after refilling? _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^  '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
|
| | |
Jason
Aficionado
Name : Jason
Age : 41
Location : Comox, BC, Canada
Joined : 2007-01-23
Post Count : 1378
Merit : 66
| | Subject: Re: AC cooling insufficient Thu Jun 09, 2011 8:38 am | |
| the gauge measures pressure. The can's weight difference after opening the valve was negligeable, and the pressure didn't fluctuate. | |
|
| | |
AA
Administrator
Name : Aaron
Age : 47
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18452
Merit : 252
| | Subject: Re: AC cooling insufficient Thu Jun 09, 2011 10:35 am | |
| Based on the low-side pressure with the AC running, and the ambient temp, you can know if the system has enough refrigerant. Here's a chart to calculate: (this rules out the possibility there is not enough in the can)  _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
|
| | |
Jason
Aficionado
Name : Jason
Age : 41
Location : Comox, BC, Canada
Joined : 2007-01-23
Post Count : 1378
Merit : 66
| | Subject: Re: AC cooling insufficient Fri Jun 10, 2011 8:51 am | |
| I know. That's why I was trying to add refrigerant. However the contents of the can didn't seem to want to flow into the car. The can got cold, but still weighed the same afterwards. The compressor was on 100% of the time, not cycling on and off. | |
|
| | |
joshuatim
Special
Name : Joshua timber
Age : 40
Location : Folsom
Joined : 2011-08-03
Post Count : 4
Merit : -5
| | Subject: Re: AC cooling insufficient Wed Aug 03, 2011 2:45 pm | |
| The refrigerant level are checked by measuring tools which are attached with the refiling cylinders? But there is a traditional method also. At the nozzle where we fill the gas you will see transparent glass. If there is forming of bubbles there then it means your refrigerant level is low. | |
|
| | |
AA
Administrator
Name : Aaron
Age : 47
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18452
Merit : 252
| | Subject: Re: AC cooling insufficient Wed Aug 03, 2011 3:05 pm | |
| Can anyone confirm joshuatim's bubbles in the glass theory?  _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
|
| | |
deekster_caddy
Master
Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109
| | Subject: Re: AC cooling insufficient Wed Aug 03, 2011 3:06 pm | |
| - Jason wrote:
- I know. That's why I was trying to add refrigerant. However the contents of the can didn't seem to want to flow into the car. The can got cold, but still weighed the same afterwards. The compressor was on 100% of the time, not cycling on and off.
Did you measure both high and low side pressures? Low alone won't tell you all you need to know. It's only useful if you are simply adding refrigerant, but not for diagnosing problems. This requires a full set of A/C gauges, not just a Low gauge like you get with the can-fillers. Plus it can take 15-20 minutes to fill. My instructions were to leave it at idle during the fill, and rotate the can periodically. | |
|
| | |
deekster_caddy
Master
Name : Derek
Age : 52
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109
| | Subject: Re: AC cooling insufficient Wed Aug 03, 2011 3:07 pm | |
| - AA wrote:
- Can anyone confirm joshuatim's bubbles in the glass theory?
I was wondering the same thing. In industrial A/C there is usually a sight glass, but not in automotive. | |
|
| | |
95 rivieramn
Amateur
Name : Dave
Age : 57
Location : Mn
Joined : 2010-11-28
Post Count : 23
Merit : 2
| | Subject: Not anymore Wed Aug 03, 2011 4:54 pm | |
| - AA wrote:
- Can anyone confirm joshuatim's bubbles in the glass theory?
Back years ago in early R12 refrigerant there was a site glass But that was years ago and I have never seen one on a r134 system | |
|
| | |
Abaddon
Expert
Name : Scott
Location : Macomb, Michigan
Joined : 2010-02-24
Post Count : 4316
Merit : 185
| | Subject: Re: AC cooling insufficient Wed Aug 03, 2011 5:08 pm | |
| No, there are no more sight glasses in Automotive applications...... | |
|
| | |
Sponsored content
| | Subject: Re: AC cooling insufficient | |
| |
|
| | |
| | AC cooling insufficient | |
|
