I had exactly the same symptoms in my 2009 JSW yesterday. the JSW sat in the Texas sun all afternoon, and at 1700 (quitting time) it blew HOT air until I got off of Fort Sam (where the speed limit is 25mph).I have been looking deeper into the A/C problems with my 1009 Jetta TDI.
It seems that there is no high/low pressure switch on this model. There is a pressure sensor that is located in the same place (I think since I have not yet located it).
I have the Bently DVD ordered, but it is not yet here.
I think ..... that the computer looks at the analog signal to determine what fan speeds etc are necessary.
The pressures need to get pretty high for the fans to be sped up. I have looked at the pressures with gauges, but not a the same time I had the VCDS hooked up.
I have been looking for information on how the system works to little profit.
Since the car cools good when moving , but takes moving at a pretty good speed to start cooling. When it is cooling it works quite well.
I suspect that the fans are working as thay should, but are not being commanded to run fast enough.
Unlike the earlier cars I THINK that the signals are "analog" or PWM or digital via CANBUS.
I would like to know how to command high speed via VCDS. This would confirm that the fans are working properly.
I also need to look at the pressures via VCDS vs. the gauges to see if the sensor might be reading low or the charg is really too low to trigger the high speed operation of the fans.
This seems to be the problem---- The fans do not speed up when high head pressure would indicate insufficient cooling of the condenser coil.
What several people have found out on our year models is that the RCV on the compressor goes bad. It basically controls the flow of freon through the compressor since it doesn't technically turn on and off. You can't buy it separate from VW but there is an aftermarket version made in china available that several people have had good results with. But you are looking at a $600 compressor vs a $45 RCV. So it is worth a shot. Many people have had good luck,including myself, with evacuating the freon, shooting an ounce or two into the system, and recharge. This will break loose some of the "gunk" that stops up the valve. Others have removed the valve and cleaned it. This was gonna be my next step if mine didn't work. I did have to use it several times before it "freed" up and now works every time. Before it would work, but you would just about start sweating because it took such a long time to come on.Have not checked for codes yet, I thought there was a light if there was a code. I see wires leading to a plug on the compressor, are there any tests to be done with a multimeter?
Mine seems to have failed as well. It's a 2011 JSW with manual AC. The light goes on, but no cold air. Vent fan works fine and there are no blown fuses.Error codes from the AC module? A common problem one these models is an internal solenoid failing. There is no clutch, the solenoid is what controls AC on vs. off.
Does changing the fan speed do anything? Climatronic or manual control?
Mine didn't work because there was no refrigerant in the system. The dealer re-charged it and added dye. It's not yet evident where it's been leaking.Anybody find out anything?
I am having the same issue on my 06 and it drives me up the wall. It works fine on the freeway. :bangshead
I called the stealership and they told me it would be 105 just to look at it!
When AC is selected the Fans are called & should operate. Check fuses.Welcome to the forum Samm. welcometomyturbodies
So what do you drive apart from a TDI?