Hi Guys and Girls...Can anyone help ?..I am stumped...I think my Aircon ...has something against me...Laugh...It just does not work....I had it regased about a month ago it was about 75% full...The state of play at the moment is if I adjust the climate control without A/C switched on it goes to hot and then comes down to normal tempi...when I switch on the A/C.....I can hear the compressor kick in..but it does not get any colder than the outsde temp..I have checked the grey vacume pipe..it is all ok...I have checked the blend doors...they are open until I press the Rest button..then they close..with the A?C on or off...it is still outside temp...when I switch off Rest they open again....are they ment to be open all the time?...Guys any help would be appreciate I am pulling my hair out here...not much left...Laugh

 

When you had your system re-charged, did it ever blow cold after that?

When your A/C is running at full cold (REST button active as well), let it run for a couple of minutes. The "low side" hose (that has the re-charge hose connection) should be getting really cold and probably start developing condensation (depending on your humidity). If it is not getting cold, your system may be over-charged. If that hose is getting really cold, you may have a blockage in the air flow. Take a look at the cabin air filter and see if it is clogged. To check this, turn off all systems and fans and then remove the panel on the passenger side under the glove box. There should be two screws near the "back" side of the panel (closer to the passenger seat). Once that panel is removed, you will see a panel with two sliding latches on it (I think the latches are an off white or yellowish color). Slide the latches out to release the cabin air filter door and the filter should drop out. Be ready for a big mess of stuff to come out with it if you've never been in there before.

Check those two items and see if that doesn't reveal anything.

Good Luck!

RL

 

Thanks RL..I will have a look at that...before I had it regased the A?c was not working and after the same..just mormal air temp..the chap said he did not know what the problem was..but it was fully charged..I ran it today and the pipe was just normal...no cold at all.

Thanks

Dax

 

When your A/C clutch engages, does it stay engaged throughout or does it cycle on and off - possibly several times a minute?

With your low side hose not getting cold, it could be over charged or under charged. You mention that when you had it re-gassed it was 75%. Did the re-gassing bring it up to 75% or was it at 75% before re-gassing and then the re-gas brought it up from there - to I'm guessing 100%? What pressures were you reading before and after the re-gas and what kind of gauge set up was used to read these pressures?

When you had it re-gassed, how many ounces of freon did your mechanic put in?

Thanks - RL

 

Hi RL ...Thanks for the info...The tech emptied the system he said there was a lot of air in the system...he then re-filled it..he looked on the fusebox cover ..it gives a pressure 88 I think..the meter he was using showed 88 once he had charged the system...he then ran the aircon...it was a hot day...but there was no cold air...the pipe was cold...having said that he had just filled it..He left the car running ...but the pipe never got cold ..when I press the A/C button...I can here the A/C clutch engage an the engine changes note slighty and when I switch the A/C off it seems to go off...and the engine note changes again..The tech said it was fully gassed and he had already checked for leaks...and wasnt sure why it was not working..I am not sure about the freon amount.....Thanks again..Dax

 

OK DJ - I think your system is overcharged. You state that your system was completely evacuated, which is good because that gives me an idea of where you started. You also state that your mechanic noted that the "pressures" should be "88" after what he read on the fuse box. I believe that your mechanic might have misread that information. Take another look at the label he read - it probably reads ".88 kilograms" which is the total amount of refrigerant that is to be used in the system, which equals about 1.97 pounds or 31.5 ounces. Here in the states, R-134a (which is the required refrigerant and hopefully what your mechanic used) comes in various size cans, but are normally between 14 and 16 ounces, so two cans would probably be sufficient in charging the Crossfire system if has been completely emptied.

As far as your pressures go - no matter what measuring unit is being used, "88" is not even in the spectrum. If you are using kPa (Kilopascals) then your charge port (low side) pressures could have been anywhere from 241 to 303, depending on your outside temps and humidity on the day you charged your system. If you are using PSI (pounds per square inch), then your pressures could have been between 35 to 44, depending on your temp and humidity.

I am attaching the Service Manual A/C service info that has a helpful chart that shows the pressures you should be seeing if charged properly so you can take it to your mechanic. Maybe he can readjust the pressures for you to match this Service Manual information.

I recently overcharged my A/C as well. It was blowing cold, but the pressures still read low so I added another 14 ounces of R-134a. After I did that, I had no cold air at all, it was about the temp of the outside air. Since I didn't have the proper set of gauges with me, I just took the cap off the low side charge port and, in a well ventilated area and with the engine running and the A/C on and on full cold, started bleeding refrigerant from the system by pressing the piston of the charge port with a screw driver (kind of like letting air out of a tire). Release some pressure for about 3 to 5 seconds then let the system balance out for about 3 minutes and then check the air at the vents to see if it's getting colder. You might even pick up a thermometer that you can attach to the vent to record the actual air temp - that will give you a better idea of what is happening. I got my air temp at the vent down to about 54F (about 12C) on a 100F (38C) day.

Hope this helps!

RL

 

Hi RL...I have done what you sujested...Ran the enginine with A/C on and let some of the gas out...it was strange it seemed more like air...I know when the tech gassed it he said there was a dye in it...I thoiught I would have seen some of that ..but didnt...still no joy..it was as warm as toast inside the car..I wonder if it might be the climate controller.....if I turn it to full heat....it gets hot...but when I turn it down..it takes ages for it to return to the outside temp....I wonder if the tech gassed it correctly....having said that it didnt work before he gassed it ...so it might be a trip down to MB...for a check up....Thanks for all your help.....Dax.

 

Sounds good, DJ. Keep me posted on the outcome - would be interesting to know.

Thanks - RL