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Jetta Need Help

ric7744 on Wed July 24, 2013 9:34 PM User is offlineView users profile

Year: 2000
Make: Volkswagen
Model: Jetta
Engine Size: 2.0
Refrigerant Type: 134a
Ambient Temp: 73
Pressure Low: 220
Pressure High: 32
Country of Origin: United States

I have been on a 1year quest to get my air really cold again. My compressor went out a year ago and I had it replace and the dryer replaced the system flushed and refilled. Car was given back to me blowing at best 50 degree vent temps on a 80 degree day. Before my compressor went I would get 39 to 40 range easy. I took it back they said they needed to replace the Condenser, I let them do this. It started to blow colder maybe 45 on a 80 degree day but shortly after I was getting a loud rumbling and whistle coming threw the vents. Took it back they said they needed to replace the expansion valve. Got the car back the rumbling was gone but it was blowing warmer and the loud whistle changed to a higher pitched whistle. took it back they said they needed to replace the expansion valve again. They did got the car back all the sounds were gone. They told me be lucky a 2000 jetta blows cold and don't come back basically. At this point it is still only getting to 50 degrees after running it for a while and we had a heat wave and i was sweating when we hit close to 100 degrees.

I decided I would take it to a local shop with a good reputation for them to check out everything they evacuated the system, took pressures, checked for leaks. They told me system was half pound low and added refrigerant back in. They said pressures were 220 high and 32 low and Ambient was 73 out. They said they got as low as 43 vent temp at idle. I got car back yesterday and now it was 85 today out and the coolest after driving for half hour I saw vent temp was 47 and to be honest I was wishing it was colder. Any opinion on why the system in not anywhere near as good as before would be great.

Dougflas on Thu July 25, 2013 7:42 AM User is offline

Could be trash/dirt on the evap or inbedded into it. Reheat from heater core due to air in the heater/evap box not going where it should be, degraded weather strips in the evap box, oil clogging evap, too much oil in the system

ric7744 on Thu July 25, 2013 11:18 AM User is offlineView users profile

If this is the case would evaporator need to be replaced? Isn't is hard to replace the evaporator. Weird thing is the system was ice cold until compressor failure but now it seems there is no way to get it back to ice cold.

ric7744 on Thu July 25, 2013 2:21 PM User is offlineView users profile

Could it be that they put on some aftermarket compressor brand is Sigma JP. Would I have been better off getting the Sanden OEM

ric7744 on Sat July 27, 2013 7:01 PM User is offlineView users profile

I may have solved the problem. I took the car out for a while today. What I found was on the freeway i can get the temp down to 43 vent temp range. I let it idle for a while and watched the temp and what the a/c was doing. I noticed the two engine fans spinning at a medium speed and when this happens the vent temp rises slowly up to a high of 54 and stays there for a while. It is only obout 75 ambient temp out today. The fans once in a while kick into a high speed and when this happens the temp drops down and get as low as 42 but the fan only stays on for 5 to 10 seconds and then goes back to a medium speed for a while up to a minute. Should this fan be kicking into higher speed more often? I seem to remember it used to do this. If this is the problem is there a relay or switch I could change and where is it located. Thanks

webbch on Sun July 28, 2013 1:08 AM User is offlineView users profile

Did you mean you identified the symptoms? It's not clear that you've found, much less solved, the problem, unless I missed something.

If the fans kick on at high speed once in awhile, then I'd doubt any problem with the fans themselves. I'd be looking for a potential (intermittent?) problem with the pressure sensor if the Jetta has one (not a low or high cutoff switch, but an actual transducer). I'm guessing the pressure sensor somehow helps the engine computer decide when to put the fans on high speed.

If the Jetta doesn't have a pressure sensor, then perhaps the ambient air temp sensor?

Edited: Sun July 28, 2013 at 1:13 AM by webbch

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