Volkswagen Polo Service & Repair Manual: Possible Concerns
 Note
| The A/C system is functioning correctly when the air flowing
from the instrument panel vents has a temperature of 70C
or lower. |
| Setting on Climatronic “LO”. |
| Setting on A/C system “AC” on; “max”; “cold”. |
Note
| With all complaints marked with *. Refer to
→ Chapter „Pressures, Checking“. |
| Total cooling system failure. * |
| Insufficient cooling performance at all vehicles speeds or
engine speeds. * |
| None or insufficient cooling after driving a few miles. * |
| A/C compressor, A/C Clutch -N25- or A/C Compressor Regulator
Valve -N280- are switched off by A/C Refrigerant Low Pressure
Switch -F73-, A/C Refrigerant High Pressure Switch -F118-, A/C
Pressure Switch -F129- or by A/C Control Head -E87- or
Climatronic Control Module -J255- due to excessive or
insufficient 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 |
| – |
Re-tighten compressor securing bolts and compressor bracket
using a torque wrench. |
| – |
Check 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. If this
occurs, flush the refrigerant circuit with refrigerant R134a.
Refer to
→ Chapter „Refrigerant Circuit, Flushing (Cleaning) with
Refrigerant R134a“. |
| Drain the refrigerant from the A/C compressor. To facilitate
this, the ribbed belt pulley or magnetic clutch plate on the A/C
compressor should be rotated by hand. After flushing, the entire
quantity of refrigerant oil specified by vehicle-specific repair
manual should be added to the refrigerant circuit (50 grams
directly in 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 open and close properly. |
| – |
Check plenum chamber cover; it must not be damaged and must
be properly installed (to stop water running into evaporator). |
| – |
Check water drains in plenum chamber; they must not be
blocked (e.g. by leaves). |
|
Note
The A/C system is functioning correctly when the air flowing
from the instrument panel vents has a temperature of 70C
or lower.
...
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Test Requirements