Get Problems with refrigerant circuit -> Possible complaints about refrigerant circuit Guide for Audi A2 SUV 1999-2005

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

Problems with refrigerant circuit

⇒ “6.1 Possible complaints about refrigerant circuit”, page 185

6.1

Possible complaints about refrigerant

circuit

⇒ “6.1.1 Test requirements:”, page 185

⇒ “6.1.2 Possible complaints”, page 185

6.1.1

Test requirements:

•

Electrical system, vacuum system and air duct fault-finding

has not revealed any faults ⇒ Vehicle diagnostic tester (“Self-

diagnosis” or “Guided Fault Finding” function for air condition‐

er), ⇒ Current flow diagrams, Electrical fault finding and Fitting

locations and ⇒ Heating, air conditioning or ⇒ Air condition‐

ing .

•

Air conditioner self-diagnosis/Guided Fault Finding with the ⇒

Vehicle diagnostic tester has not revealed any faults, no com‐

pressor shut-off criteria displayed in measured value block

(vehicles with “air conditioner” self-diagnosis only) ⇒ Heating,

air conditioning or ⇒ Air conditioning or “Guided Fault Finding”

function ⇒ Vehicle diagnostic tester .

6.1.2

Possible complaints

Note

♦ For all complaints marked *, refer to ⇒ page 193 “Checking

pressures”.

♦ If problems are only encountered at one evaporator on vehi‐

cles fitted with two evaporators, also check the pressures in

the refrigerant circuit.

♦ Observe test requirements ⇒ page 185 .

Vehicles without high-voltage system

♦ The cooling system has failed completely.*

♦ Insufficient cooling output at all vehicle speeds/engine

speeds.*

♦ No or insufficient cooling after driving a few miles. *

♦ No or insufficient cooling at one or via both evaporators (on

vehicles with two air conditioning units). *

♦ Air conditioner compressor, air conditioning system magnetic

clutch - N25- or air conditioner compressor regulating valve -

N280- are shut off by a pressure switch (e.g. -F73-, -F118-, -

F129- or by the operating and display unit for front air

conditioning system - E87- or the Climatronic control unit -

J255- ) on account of excessive or inadequate pressure. * ⇒

Heating, air conditioner; Rep. gr. 87 ; Refrigerant circuit (ve‐

hicle-specific Workshop Manual).

♦ Fresh air supply is not available or is reduced significantly after

driving several miles (evaporator iced up). *

Vehicles with high-voltage system

♦ The cooling system has failed completely.*

♦ Insufficient cooling output at all vehicle speeds/air conditioner

compressor speeds.*

6. Problems with refrigerant circuit

185

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...

Air conditioner with refrigerant R134a - Edition 11.2018

♦ No or insufficient cooling after driving a few miles. *

♦ No or insufficient cooling at evaporator or at one of the heat

exchangers (e.g. heat exchanger for high-voltage battery). *

⇒ Heating, air conditioner; Rep. gr. 87 ; Refrigerant circuit

(vehicle-specific Workshop Manual).

♦ No or insufficient heating output at heat exchanger for heat

pump operation (e.g. on the Audi Q7 e-tron)* ⇒ Heating, air

conditioning; Rep. gr. 87 ; Refrigerant circuit (vehicle-specific

Workshop Manual).

♦ The electrical air conditioner compressor - V470- is switched

off by a control unit (e.g. operating and display unit for front air

conditioning system - E87- , Climatronic control unit - J255- or

thermal management control unit - J1024- ) if the pressure is

too high or too low. * ⇒ Vehicle diagnostic tester in “Guided

Fault Finding” mode

♦ Fresh air supply is not available or is reduced significantly after

driving several miles (evaporator iced up). *

All vehicles

In addition, the following problems may occur:

The air conditioner compressor is noisy

– Re-tighten the bolts for the air conditioner compressor and the

compressor holder using a torque wrench.

– Check routing of refrigerant pipes; they must not touch other

components and must not be subject to strain (align if neces‐

sary).

Noise (refrigerant hammer) occurring immediately after switching

on the air conditioner and/or when cornering or braking

– Discharge, evacuate and re-charge refrigerant circuit (too

much refrigerant in circuit).

Note

Too much refrigerant oil in the circuit may also result in this prob‐

lem (no adjustment of refrigerant oil quantity, for example, when

renewing compressor).

Water sprays out of the vents (in the dash panel or footwell) al‐

though the air conditioning system is otherwise functioning prop‐

erly

– Check proper routing of condensation drain; it must not be

crushed or kinked.

– Check the condensation drain valve; it must not be gummed

up with wax or underseal and must close properly.

– Check the plenum chamber cover; it must be undamaged and

be installed correctly (no water must flow into the evaporator).

– Check water drains in plenum chamber; they must not be

blocked (e.g. by leaves).

186

Rep. gr.87 - Air conditioning system

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Problems with refrigerant circuit -> Possible complaints about refrigerant circuit for Your Audi A2 SUV 1999-2005

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