Possible Concerns

WARNING: This page is about a different car, the 2018 Volkswagen Jetta, 2017 Volkswagen Jetta, 2016 Volkswagen Jetta, and 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

With all complaints marked with *. Refer to PRESSURES, CHECKING .

If a malfunction occurs at only one evaporator in vehicles with two evaporators, also check the pressures in the refrigerant circuit. Refer to PRESSURES, CHECKING .

Total cooling system failure.*
Insufficient cooling output at all vehicles speeds or engine speeds.*
None or insufficient cooling after driving a few miles. *
No cooling or insufficient cooling at one or both evaporator(s) (on vehicles with two heater and A/C units/evaporators). *
The activation of the A/C compressor (via the A/C Clutch -N25- or the A/C Compressor Regulator Valve -N280-) is switched off by the corresponding control module (for example the Front A/C Display Control Head -E87-, the A/C Control Module -J301- or the Climatronic Control Module -J255-) due to high or too low refrigerant circuit pressure*. Use the Vehicle Diagnostic Tester in the A/C system "Guided Fault Finding " function.
The Electrical A/C Compressor -V470- is activated by the A/C Compressor Control Module -J842- due to too high or too low pressure*. Use the Vehicle Diagnostic Tester in the A/C system "Guided Fault Finding " function and the battery regulation.
No or sharp decrease in fresh-air supply after driving several miles (evaporator iced up). * Use the Vehicle Diagnostic Tester in the A/C system "Guided Fault Finding " function.

From These, The Following Complaints May Also Occur:

The A/C compressor makes noises

-- Tighten compressor securing bolts and compressor bracket using a torque wrench. Refer to REFRIGERANT CIRCUIT .

-- Check the routing of the refrigerant lines they must not contact other components and must be installed without tension (adjust if necessary). Refer to REFRIGERANT CIRCUIT .

Noise (refrigerant hammer) occurring immediately after switching on air conditioner and/or when cornering or braking:

-- Discharge, evacuate and charge refrigerant circuit (too much refrigerant or refrigerant oil in the circuit). Refer to WORKING WITH A/C SERVICE STATION and PRESSURES, CHECKING .

NOTE:

Too much refrigerant oil in the circuit could also cause this problem. This could occur if the amount of refrigerant oil was not adjusted when replacing the A/C compressor. Refer to COMPONENTS, REPLACING .

Water sprays out of vents (in dash panel or footwell) although air conditioning system is otherwise functioning properly:

-- Check the condensation water drain is routed properly it must not be crushed or kinked. Refer to FRONT HEATER AND A/C UNIT .

-- Check condensation drain valve, it must not be clogged by wax or underbody sealant and must close properly. Refer to FRONT HEATER AND A/C UNIT .

-- Check the plenum chamber cover, it must not be damaged and must be properly installed (no water may enter the evaporator). Refer to REFRIGERANT CIRCUIT and COMPONENT LOCATION OVERVIEW - A/C SYSTEM .

-- Check the plenum chamber water drains, they must not be closed (for example due to leaves). Refer to REFRIGERANT CIRCUIT and COMPONENT LOCATION OVERVIEW - A/C SYSTEM .

NOTE:

Component location and additional for these components. Refer to COMPONENT LOCATION OVERVIEW - A/C SYSTEM .