Possible Concerns:

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NOTE:

For all complaints marked *. Refer to PRESSURES, CHECKING "Checking pressures".

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

Observe the test requirements. Refer to TEST REQUIREMENTS: .

Total cooling system failure.*
Insufficient cooling performance 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 evaporators). *
No cooling or insufficient cooling at one or both evaporator(s) (on vehicles with hight voltage system and battery cooling). *
Compressor, A/C Clutch -N25- or A/C Compressor Regulator Valve -N280- shut off by pressure switch (e.g. -F73-, -F118-, -F129- -F129- or by A/C Control Head -E87- or Climatronic Control Module -J255-) due to excessive or inadequate pressure. *
None or sharp decrease in fresh-air supply after driving several miles (evaporator iced up). *

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.

-- Check the routing of refrigerant lines; they must not touch other components and must not be subject to strain (align if necessary).

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 in circuit).

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.

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

-- Check proper routing of condensate drain; it must not be crushed or kinked.

-- Check condensation drain valve, it must not be clogged by wax or underbody sealant and must close properly.

-- Check plenum chamber cover; it must not be damaged and must be properly installed (to stop water running into evaporator).

-- Check the water drains in plenum chamber; they must not be blocked (for example, by leaves).