Volkswagen Polo Service & Repair Manual: Possible Concerns

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / Concerns / Possible Refrigerant Circuit Concerns / 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).

Test Requirements

Note The A/C system is functioning correctly when the air flowing from the instrument panel vents has a temperature of 70C or lower. ...

Odor from the Heater and A/C Unit

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Other materials:

Warning lamp and coolant temperature display
Fig. 138 Coolant temperature display in instrument cluster: Ⓐ cold; Ⓑ normal; Ⓒ warning First read and observe the introductory information and safety warningsA display for the coolant temperature may be, depending on the vehicle equipment, located in instrument cluster. In normal driv ...

Displays
Fig. 12 A: bonnet open, B: tailgate open, C: front left door open, D: right rear door open (only in four-door vehicles) First read and observe the introductory information and safety warnings Depending on the vehicle equipment level, a variety of information can be displayed in the instr ...

Using a mobile telephone in the vehicle without a connection to the external aerial
First read and observe the introductory information and safety warningsBoth during telephone calls and in standby mode, mobile telephones transmit and receive radio waves, which may also be termed "high-frequency energy". Current scientific literature warns us that radio waves can be harmful ...