Sunday, July 5, 2020

Volkswagen Jetta A/C Does Not Blow Cold Air

Volkswagen Jetta A/C Does Not Blow Cold Air





A busted A/C on a Volkswagen Jetta is the problem of the day. We just solved an A/C problem on a Chevy Equinox, so let's see what we can find on the Volkswagen Jetta GLS. The Volkswagen Jetta is a great car and with a little bit of maintenance will last you a long time. But there are some issues with the A/C. 1 complaint from Volkswagen owners. Customer Concern: The A/C system does not blow cold air. There is a vibration and/or noise in the A/C lines that can be felt inside the passenger compartment of the vehicle. And once again we will start with some basic tests to see if we can find any obvious problems. 1. Install a gauge set on the Jetta and look at what the gauges say. A. If the high side pressure is high and the low side pressure is high, that would indicate an A/C compressor overcharge situation (this could be refrigerant or oil overcharge).





B. If the high side pressure is high and the low side pressure is low, this could indicate that the a/c compressor is stuck at its maximum displacement or that there is an other-than-specified restriction in the system. Signs of frost on the lines indicate the point of restriction. 2. Flush the A/C system with nitrogen or refrigerant. This requires using a "dummy" restrictor that is a straight opening at the flush point. DO NOT under any circumstances use air to flush or blow out the lines. This will introduce moisture to the system that will be difficult to get rid of. Flushing the A/C ensures that all the refrigerant and oil is out of the system so that when the charge procedure is performed, one can be as accurate as possible about the amount of refrigerant and oil in the system. 3. Inspect the restrictor for signs of damage. Look to see if the restrictor is completely plugged. On expansion-type restrictors, look to see if anything is blocking the movement of the valve. 4. Inspect the A/C lines for evidence of desiccant coming apart. This will typically look like a gray sludge paste (think valve-lapping compound). If the desiccant has come apart, flush the A/C system. The desiccant can plug up the restrictor or cause damage to the compressor. 5. When replacing the Volkswagen Jetta's compressor it is recommend to drain all the oil out of the compressor (if pre-filled) and measure the amount of oil. This way, the actual amount of oil in the A/C system can be known and accounted for. Tech Tips: VW/Audi recommends replacing the drier unit along with the compressor.





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Ever since the last Jetta redesign in 2011, we've had trouble accepting its new mission in life. Jettas of the past represented the best of European cars, more refined and better to drive than competing compact sedans. The good news is that this redesigned 2019 Volkswagen Jetta gets the car back closer to its roots while still offering the size and value that today's shoppers expect. Volkswagen has made a lot of changes to the Jetta, refining the interior and replacing some of the low-cost mechanical bits with more sophisticated hardware. And when it comes to passenger and trunk space, the current Jetta trounces its predecessors, not to mention a few midsize sedans. Backseat comfort is excellent, and trunk space is generous. Now, there's modern design, excellent build quality and the latest in in-car electronics. Thanks to VW's Digital Cockpit and safety technology, the Jetta rivals luxury sedans that cost twice as much.