Volkswagen Golf / Golf GTI / Jetta. Manual — part 982

87-135

Test 2: A/C system high pressure, checking

- Connect high- and low-pressure hoses of

refrigerant recovery/ recycling/recharging unit
Kent-Moore ACR

4

or equivalent, to high- and

low-pressure service valves.

- Disconnect electrical connector from coolant

fan.

- Start engine.

- Set temperature control to maximum "hot" (if

manual A/C) or "HI" (if Climatronic).

- Manual A/C: Press "A/C" button and select

highest blower speed.

- Adjust air distribution to footwell outlets.

- Raise engine speed to approximately 1500

RPM.

Specified result

System high pressure is normal if high-pressure

gauge reads 232 psi (16 bar) within 30 seconds.

If specified reading is not obtained, also perform

test 3 and compare results of all three tests

table,

Page 87-137

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A/C refrigerant system, troubleshooting

13/2/2005

87-136

Test 3: A/C system low pressure, checking

- Connect high- and low-pressure hoses of

refrigerant recovery/recycling/recharging unit
Kent-Moore ACR

4

, or equivalent, to high- and

low-pressure service valves.

- Start engine.

- Set temperature control to maximum "cold" (if

manual A/C) or "LO" (if Climatronic).

- Manual A/C: Press "A/C" button and select first

blower speed.

- Climatronic: Select minimum blower speed

(manual override)) by pressing "decrease blower
speed" button (observe blower speed display in
control head).

- Adjust air distribution to instrument panel

outlets.

- Raise engine speed to 1500 RPM.

Specified result

System low pressure is normal if low-pressure

gauge reads 22-36 psi (1.5-2.5 bar) within 30
seconds.

If specified reading is not obtained, compare

results of all three tests

table,

Page 87-

137

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A/C refrigerant system, troubleshooting

13/2/2005

87-137

Test 1

Temperature

from center air

vent

1)

Test 2

High

pressure

2)

Test 3

Low

pressure

2)

Possible

causes of

incorrect

readings

Corrective
measures

Normal

Normal

Normal

None

---

Too high

Normal

Normal

Temperature flap

position

incorrect

Adjust temperature

flap cable

Too high

Too low

Normal

Compressor

Replace

compressor

Normal

Too low

Normal

Compressor

Replace

compressor

Normal

Normal

Too high or

too low

Too high

Normal

Too high or

too low

Expansion valve

or compressor

Clean/replace

expansion valve or

replace compressor

Normal

Too high or

too low

Too high or

too low

1)

Normal air outlet temperature approx. 6 C (43 F). For higher ambient temperatures

and/or higher humidity, specified air temperature from center instrument panel vent can
be slightly higher.

2)

For normal system temperatures and pressures

Page 87-120

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A/C refrigerant system, troubleshooting

13/2/2005

87-138

A/C refrigerant system cooling
performance, checking

Note:

Variable displacement A/C compressor maintains

temperature of 0 C (32 F) in evaporator.

Test conditions

A/C refrigerant system fully charged

A/C clutch -N25- and compressor function

OK

Condenser and radiator clean and free of

obstructions

Air distribution can be adjusted properly

Wiring OK as per wiring diagram

Outside (ambient) temperature 20 C-30 C

(68 F-86 F)

A/C refrigerant system, troubleshooting

13/2/2005