VW Tiguan Manuals

Volkswagen Tiguan Service and Repair Manual: Components, Replacing

General Information

  • All components of the refrigerant circuit submitted for quality observation are always to be sealed (use original sealing caps of original part).
  • To date, the original parts (compressor, reservoir, receiver/dryer, evaporator and condenser) have been filled with nitrogen gas. This charging stops gradually or the charging pressure is so low that gas does not escape noticeably when opening.
  • On vehicles installed with a compressor with no A/C clutch, the engine is only to be started following complete assembly of the refrigerant circuit (compressor always in operation as well).
  • So that the compressor with A/C Compressor Regulator Valve -N280- (without A/C clutch) is not damaged when the refrigerant circuit is empty, it is equipped with a secured oil supply. This means that approximately 40 to 50 cm3 of refrigerant oil remains in the A/C compressor.

Note

  • As original parts are sometimes stored for lengthy periods and at different locations within the spare parts organization, it is entirely possible that gas will escape from some parts and not from others on initial opening (even in the case of identical original part numbers). Sealing caps at original part connections are therefore to be removed carefully and the nitrogen gas allowed to escape slowly.
  • The refrigerant circuit is equipped either with a restrictor and accumulator or with an expansion valve and receiver/dryer.
  • Seal open connections and pipes (to prevent absorption of moisture).
  • Always replace the restrictor.

The reservoir/receiver/dryer or dryer bag/cartridge should not be replaced under the following conditions.

  • After an accident when there is no damage on the reservoir/receiver/dryer.
  • The repair was done quickly (not beyond the normal repair time) and no moisture has entered. The vehicle is not older than 5 years.

The reservoir/receiver/dryer or dryer cartridge should be replaced under the following conditions.

  • The refrigerant circuit was opened and the vehicle is older than 5 years.
  • The refrigerant circuit has been opened for an indefinite period of time (slow leak).
  • The repair exceeded the normal repair time and moisture has entered.
  • Always replace the receiver/dryer or dryer cartridge after flushing with compressed air, nitrogen or refrigerant R134a. Leave original parts in their packaging as long as possible to minimize the amount of moisture they absorb.
  • The A/C compressor has locked up.
  • The reservoir/receiver/dryer is damaged (accident).

Leaking or Damaged Components except A/C Compressor, Reservoir or Receiver/Dryer

Empty Refrigerant Circuit

  • Remove malfunctioning component.
  • Remove the A/C compressor.
  • Remove oil drain plug from A/C compressor.

Note

  • To speed up refrigerant oil drainage, turn A/C compressor by hand via ribbed belt or magnetic clutch plate.
  • Pour the used refrigerator oil out of the A/C compressor.
  • Then fill the A/C compressor with quantity of fresh refrigerant oil corresponding to quantity of refrigerant oil in original part compressor.
  • Use different refrigerant oils and quantities for the various compressors.
  • To ensure the compressor is lubricated at start-up, at least 80 cm3 of refrigerant oil must be poured into the compressor. The remainder can be added to the new reservoir or receiver/dryer.
  • If dirt has penetrated into the compressor with the refrigerant circuit open (for example after an accident), compressor is to be replaced.
  • Flush the refrigerant circuit with compressed air and remove moisture with nitrogen.

 

  • Replace receiver/dryer or accumulator and restrictor.
  • Assemble, evacuate and recharge refrigerant circuit.

Refrigerant Still in Circuit

  • Discharge the refrigerant circuit.
  • Remove malfunctioning component, flush with compressed air, collect escaping refrigerant oil.
  • The new component is to be filled with the amount of refrigerant oil flushed out (plus 20 cm3 for evaporator, plus 10 cm3 for condenser, refrigerant pipes and refrigerant hoses) as fresh refrigerant oil fill.
  • Replace the restrictor depending on the vehicle.
  • Assemble, evacuate and charge the refrigerant circuit.

A/C Compressor, Replacing

Flushing Not Necessary

Note

For vehicles with an electrically-driven A/C compressor, de-energize the high voltage system before removing the A/C compressor.

  • Discharge the refrigerant circuit.
  • Remove the A/C compressor.

Note

If a different A/C compressor is installed with a different refrigerant oil, the refrigerant circuit is to be flushed with refrigerant R134a.

Electrically-driven A/C compressor:

If an electrically-driven A/C compressor is being replaced that does not have a mechanical fault (for example, a faulty circuit board), then determine how much refrigerant is in this A/C compressor.

Note

  • This A/C compressor must be flushed to get all the refrigerant oil out.
  • The A/C compressor is flushed in the flow direction (from the low pressure side input to the high pressure side output)
  • So that as much refrigerant oil as possible is flushed out of the A/C compressor, the A/C compressor must be positioned so that the high pressure side output is as low as possible.
  • If an A/C service station without a flushing program is used, the procedure must be performed manually (evacuate, flush 3 times with at least 2 kg refrigerant each and extract refrigerant again, evacuate).

Quantity: for example 50 cm³

Pour so much refrigerant oil out of the new A/C compressor so that only the amount remains (plus 10 cm 3) that had been flushed out of the old A/C compressor beforehand. If the new original A/C compressor has for example, 200 cm3, then only pour out 140 cm3.

  • Pour old refrigerant oil out of A/C compressor. Handling refrigerant oil.

Note

In not enough refrigerant oil can be poured out from the A/C compressor to be installed, flush the new A/C compressor. After flushing, fill the A/C compressor to be installed with as much new refrigerant oil as was flushed from the replaced A/C compressor.

Mechanically Driven A/C Compressor:

  • Remove oil drain plug from A/C compressor.
  • To accelerate drainage of refrigerant oil, rotate compressor e.g. by way of ribbed belt pulley/clutch plate of A/C clutch for example. Does not apply to the electrically-driven A/C compressor.
  • Pour old refrigerant oil out of A/C compressor. Handling refrigerant oil.
  • Remove oil drain plug from original part compressor, pour out refrigerant oil and only add a quantity of fresh refrigerant oil equal to the amount poured out of the malfunctioning compressor.

Note

  • If, for example, 70 cm3 of refrigerant oil has been poured out of the malfunctioning A/C compressor and 220 cm3 out of the original part A/C compressor (a small quantity of refrigerant oil remains in the A/C compressor). Fill the compressor to be installed with 70 cm 3 of refrigerant oil (use can be made of oil poured out of original part compressor).
  • Use different refrigerant oils and quantities for the various compressors.
  • If a greater quantity of refrigerant oil (more than approximately 80 cm3) has been poured out of the malfunctioning compressor, the remaining refrigerant oil can also be added to the evaporator or reservoir/receiver/dryer.

 

  • Replace the restrictor depending on the vehicle.
  • Assemble, evacuate and charge the refrigerant circuit.

Leaks or Internal Damage, for Example Noises or No Output

Note

For vehicles with an electrically-driven A/C compressor, de-energize the high voltage system before removing the A/C compressor.

  • Discharge the refrigerant circuit.
  • Remove the A/C compressor.

Note

  • In the case of internal damage (on A/C compressor), flush refrigerant circuit with refrigerant R134a.
  • If a different A/C compressor is installed with a different refrigerant oil, the refrigerant circuit is to be flushed with refrigerant R134a.

 

  • Replace receiver/dryer/dryer cartridge and expansion valve or reservoir and restrictor.
  • If a leak is present, check the expansion valve for debris or corrosion and replace if necessary.
  • Assemble, evacuate and charge the refrigerant circuit.

Receiver/Dryer or Reservoir and Restrictor, Replacing

Contaminants Removed from Refrigerant Circuit

The reservoir/receiver/dryer or dryer bag/cartridge should not be replaced under the following conditions.

  • After an accident when there is no damage on the reservoir/receiver/dryer.
  • The repair was done quickly (not beyond the normal repair time) and no moisture has entered. The vehicle is not older than 5 years.

The reservoir/receiver/dryer or dryer cartridge should be replaced under the following conditions.

  • The refrigerant circuit was opened and the vehicle is older than 5 years.
  • The refrigerant circuit has been opened for an indefinite period of time (slow leak).
  • The repair exceeded the normal repair time and moisture has entered.
  • Always replace the receiver/dryer or dryer cartridge after flushing with compressed air, nitrogen or refrigerant R134a. Leave original parts in their packaging as long as possible to minimize the amount of moisture they absorb.
  • The A/C compressor has locked up.
  • The reservoir/receiver/dryer is damaged (accident).

 

  • Discharge the refrigerant circuit.
  • Remove the A/C compressor.
  • Rectify cause of trouble.
  • Examine expansion valve for dirt or corrosion; replace if necessary.
  • Remove oil drain plug from A/C compressor.
  • To accelerate drainage of refrigerant oil, rotate compressor e.g. by way of ribbed belt pulley/clutch plate of A/C clutch for example.
  • Pour old refrigerant oil out of A/C compressor. Handling refrigerant oil.
  • Then fill compressor with quantity of fresh refrigerant oil corresponding to quantity of refrigerant oil in original part compressor.

Note

  • Which refrigerant oils and quantities are used for the various compressors.
  • To ensure the compressor is lubricated at start-up, at least 80 cm3 of refrigerant oil must be poured into the compressor. The remainder can be added to the new reservoir or receiver/dryer.
  • If dirt has penetrated into the compressor with the refrigerant circuit open (for example after an accident), compressor is to be replaced.

 

  • Replace receiver/dryer or accumulator and restrictor.
  • Assemble, evacuate and charge the refrigerant circuit.
    Checking with Expansion Valve, Receiver/Dryer and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor
    Specified Values Note Connecting service station. Observe test requirements.   Bring engine speed up to 2000 RPM. Pay attention to the A/C service station pressure gauge. Note High-press ...

    Special Tools
    Testing Equipment, Tools and Materials Commercially Available Tools and Materials Note This list outlines the testers, tools and materials required for expert refrigerant circuit repair work. Caution ...

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