DanG144
Top Post Dawg
I never hear mine either. Never, unless the AC is on.
Perhaps the fan will fix it.
Perhaps the fan will fix it.
I thought i did one a while back. I will have to see.DanG144 said:hevster,
They came directly from the Bentley manual chart for normal operation.
I, personally usually see more like 25 psig on the low side on my own cars and up to 35 psig on others.
I have tried (not very successfully) to keep this thread on the electrical control side of things. So I gave a simplistic answer to a question that obviously came from a novice at AC work. Perhaps I should have ignored the question.
Knowledgeable folks know that the refrigerant cycle pressures and temperatures vary depending upon the conditions - and how they vary, and why they vary. I refuse to attempt to try to address these issues unless I am in a one on one situation. I simply am not up to the task via a written media.
Now if someone else would attempt a troubleshooting guideline thread on the mechanical side of things...
Well I originally decided to change the left fan, but I am going on previous experiences of only doing 1/2 of the job, and the other 1/2 always seemed to die not long afterwards so I ordered the right side fan as well.DanG144 said:I never hear mine either. Never, unless the AC is on.
Perhaps the fan will fix it.
The battery was removed, and there was 2 small wires, i think brown, that were grounded right under the battery tray, the ground were fine at that location. I don't see, however, how a bad ground would make the ground wire turn into a positive wire, which all 3 wires at the fans have 13 volts.DanG144 said:scidav,
This means that your main problem is almost certainly your grounding wires for the clutch, fcm, fans, G65. One common grounding wire path, as mentioned above.
Good luck finding and fixing it.
Please take photos for us to define the grounding locations.
There are grounds underneath the battery box, but on top of the mounting plate. But I do not remember any of them being a 4.0 mm wire. The only large wire I remember seeing there was the huge main ground.
So you are going to repair or replace the big fan?WhiteBox said:First sorry to bust in since i don't own TDI but i been to dealer service already few times about same problem and every time they just seams like skip over my problem and do zillion other things.
Anyway while ago while trying to get out of traffic after 4th July firework my temp gauge started rising. Kind got worried there for second but just before temp vent into red i was able to get out traffic and hit highway, as soon as i started gaining some speed temp vent down. I think that was like 3 years ago. So ever since every time i vent to service i would complain about that and they would "like" do something but same problem still exist. I drive to work 20 miles after about 10-15 miles driving if i get stuck in traffic where it would be bumper to bumper my temp would start going up.
So i did your little test with push the AC button in, place a fan in slow and leave your key to ON, small fan is truning in what looks like slow speed big fan not at all.
I checked that fuse on top of battery and it seems ok as well the connection where fuse goes in.
AC seems to be working ok, i get enough cold air that will cool down inside in no time.
P.S. i own 2002 Jetta 1.8T and can't wait to pay of that car so i can go get big gun and shot the car.
Thanks,
Is there anything else that i can check before i do that just to be sure that something else is not wrong and not the big fan?DanG144 said:So you are going to repair or replace the big fan?
Well lone behold when I got home the left side fan arrived, still waiting for the right side to arrive Monday. I installed the left side fan in about 1/2 hour with the car on ramps. As soon as I tested the fans with the car not idling, the new fan sounded like a whirlwind compared to the old fan I could now hear as well that my right side fan is dying too, and does not spin as fast as the new fan. That will be taken care of shortlySheeB said:Well I originally decided to change the left fan, but I am going on previous experiences of only doing 1/2 of the job, and the other 1/2 always seemed to die not long afterwards so I ordered the right side fan as well.
If that does not fix the issue, I will replace the high pressure switch. At least it seems easy to swap out and locally its only about $50 which is not a back breaker
You are correct. The schematic is the same.d2305 said:I think that the a/c is pretty much the same in the 1.8 as the 1.9.
When you say the fans cycle, do you mean they start and stop, or change speed? If so check the fuses listed in post #1 in the documents linked. If they are all good, (and the fans do cycle) then this is often caused by a failed pressure transducer.GD said:Hi,
Anyone know why the power to the Ac compressor pulsates and not provide steady voltage for the clutch to kick in?
The refrigirent is full and both cooling fans cycle when AC switch is on.
I recently replaced the large fan as it seized up and the small fan was replaced due to it operating at one speed. Also replaced the large strip fan fuse on top of the battery.
Thanks
Fans are good they come on together (and stay on) when the AC is switched on but the power to the AC compressor is not constant it comes and goes and not enough for the ac clutch to kick in.DanG144 said:When you say the fans cycle, do you mean they start and stop, or change speed? If so check the fuses listed in post #1 in the documents linked. If they are all good, (and the fans do cycle) then this is often caused by a failed pressure transducer.
Haven't checked the clutch coil resistance just the voltage to the compressor.DanG144 said:Yes that is the high pressure sensor or transducer for A4 cars after May of 99.
But since the fans are behaving properly, that is not likely to be your problem. If it was bad the fans would be cycling when the voltage to the compressor does.
Are you sure your clutch coil resistance is 4 ohms?