| Checking heat output of air conditioner and actuation of temperature flaps |
| Vehicles with a high-voltage system (hybrid vehicles) |
| As work in the vicinity of high-voltage system components is necessary for the following sequence of operations, perform „Visual inspection of high-voltage components and cables for damage“ → Chapter and heed the „General warnings for working on high-voltage system“ → Electrical system; Rep. gr.93 |
WARNING | Danger from unexpected engine starting |
| When performing general work on vehicles with a high-voltage system, switch off the ignition and remove the ignition key from the passenger compartment. |
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WARNING | Working on vehicles with high-voltage wiring: |
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| Do not support yourself or tools on high-voltage wiring or associated components --> this can damage the insulation. |
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| High-voltage wiring must not be excessively bent or kinked --> this can damage the insulation. |
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| The round high-voltage connectors are colour-coded with an external coloured ring and are provided with mechanical coding or guide lugs. It is important to observe this coding when joining up the round high-voltage connectors, otherwise the connectors can be damaged. |
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DANGER! | Risk of fatal injury if high-voltage components are damaged. |
| Observe the following when working in the vicinity of high-voltage components or wiring: |
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| It is not permitted to use cutting or forming tools, other sharp-edged tools or heat sources such as welding, brazing, soldering, hot air or thermal bonding equipment. |
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| Before starting work, visually inspect the high-voltage components in the areas involved. |
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| Before working in the engine compartment, visually inspect the power electronics -JX1-, electric drive motor -V141-, air conditioner compressor -V470- and high-voltage wiring. |
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| Before working on the vehicle underbody, visually inspect the high-voltage wiring and covers. |
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| Before working on the rear section of the vehicle, visually inspect the high-voltage wiring and the electro-box with the maintenance connector for high-voltage system - TW -. |
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| Visually inspect all potential equalisation lines. |
| Check the following when making the visual inspection: |
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| There must be no external damage on any component. |
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| The insulation of the high-voltage wiring and potential equalisation lines must not be damaged. |
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| There must be no unusual deformation of the high-voltage wiring. |
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| All high-voltage components must be identified by a red warning sticker. |
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| Working with ignition switched on or high-voltage system active |
DANGER! | Danger from unexpected engine starting and risk of poisoning in enclosed areas when working with the ignition switched on or with READY activated. Risk of parts of the body and/or clothing becoming trapped or caught up. |
| Take the following action before switching on the ignition: |
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| Move the selector lever to position P |
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| Activate the parking brake |
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| Switch off the ignition |
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| Connect a charger, e.g. Battery charger -VAS 5095A- to the jump start points of the 12 V vehicle electrical system |
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| For checking and measurement work where READY has to be active or the ignition switched on, set the selector lever to position „P“, activate the parking brake, arrange the necessary tools such that they cannot come into contact with rotating engine components and be sure to keep well away from rotating components when the engine is running. |
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| The selector lever is also to be set to position „P“ and the parking brake activated for checking and measurement work where the ignition has to be switched on but READY does not have to be active. |
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| READY is displayed in the control unit in dash panel insert -J285- via the „Powermeter“ → Owner's manual. |
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| For READY activation and deactivation, refer to → Owner's manual (heed the display in the control unit in dash panel insert -J285- when doing so). |
| Special tools and workshop equipment required |
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| Battery charger, 60 A -VAS 5904- |
DANGER! | Danger from unexpected engine starting and risk of poisoning in enclosed areas when working with the ignition switched on or with READY activated. Risk of parts of the body and/or clothing becoming trapped or caught up. |
| Take the following action before switching on the ignition: |
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| Move the selector lever to position P |
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| Activate the parking brake |
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| Switch off the ignition |
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| Connect a charger, e.g. Battery charger -VAS 5095A- to the jump start points of the 12 V vehicle electrical system |
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| If the ignition is on and READY active, the engine only starts or runs if warmer coolant is required to attain the set temperature in the passenger compartment or e.g. the drive battery -A2- (hybrid battery) is not sufficiently charged. |
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| Activate READY (heed the display in the control unit in dash panel insert -J285-) → Owner's manual. |
| Special tools and workshop equipment required |
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| Vehicle diagnostic, testing and information system -VAS 5051/- (or vehicle diagnostic and service information system -VAS 5052-). |
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| Commercially available thermometer (for temperature measurement; if applicable use thermometer with 2 probes for simultaneous measurement of temperature e.g. on right and left) |
| If the coolant circuit is not completely bled after filling, air may accumulate in the heat exchanger of the air conditioning unit and thus reduce the heat output of the air conditioner. In addition, noise may occur or complaints may be received about differences in the temperature of the air from the driver's and front passenger's vents despite identical setting. |
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| Perform a lengthy test drive at high engine speed with „Maximum air conditioner heat output“ set (at least 10 minutes, engine speed above 2500 rpm). In doing so, select a low gear to prevent excessive vehicle speed. |
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| In the event of complaints about poor heat output at certain engine speeds, check incorporation of the heat exchanger in the air conditioning unit into the coolant circuit. If the two coolant hoses (supply and return) from the engine have been interchanged, coolant will flow in the wrong direction through the heat exchanger → Engine, mechanics; Rep. gr.19. |
| Problems relating to differences between the temperature of the air emitted from the vents in air conditioner control mode may be due to the following: |
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| One or more temperature flap(s) in heater housing not closing completely or not reaching end position. |
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| Air in heat exchanger (fluctuating flow through heat exchanger and thus uneven heat distribution). |
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| Detachment of foam seal on heat exchanger installation, allowing air to flow past heat exchanger → Chapter |
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| Detachment of foam seal on installation of supplementary air heater element -Z35- / honeycomb element, allowing air to flow past the built-in separators → Chapter |
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| Air conditioner refrigerant circuit not filled with the correct amount of refrigerant (perform cooling output test) → Chapter |
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| As of Model Year 2010 a start/stop system will be available as an optional extra for this vehicle in conjunction with certain engines. The stop function may be inhibited by the operating and display unit, Climatronic control unit -J255- depending on its setting. If „Defrost“ mode has been set for example, no stop function is possible or the stop function is terminated and the engine started as soon as this mode is selected. This also applies if the difference between the set specified temperature and the measured actual temperature exceeds a certain value in heating and cooling mode → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
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| Depending on the vehicle model, -V50- (-V36-) is actuated not only with the „Stop function“ active but also with the engine running e.g. with „warm“ temperature setting on the air conditioner operating and display unit, Climatronic control unit -J255- („HI“ display on air conditioner operating and display unit and Multi Media Interface). -V50- (-V36-) is then actuated to assist the engine coolant pump → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
| Actuation of the temperature flaps differs between the air conditioner „Basic“ and „Deluxe“ versions → Chapter. |
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| With the air conditioner „Deluxe“ version, the temperature flap for front right is actuated by the right temperature flap control motor -V159- and the temperature flap for front left by the left temperature flap control motor -V158-. The two temperature flaps for the rear right and rear left footwell vents and the vent in the rear centre console are inter-linked by way of a connecting rod and actuated by the rear temperature flap control motor -V137-. |
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| With the air conditioner „Basic“ version, the top and bottom temperature flaps (for front right and right footwell vent) and the top and bottom temperature flap (for front left and left footwell vent) are inter-linked by way of the shafts. The shafts of the right and left temperature flaps are inter-linked by way of a connecting rod and jointly actuated by the temperature flap control motor -V68-. |
| Notes for vehicles with auxiliary heater |
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| On the Audi Q5, actuation of the heater coolant shut-off valve -N279- is only permissible up to an engine speed of approx. 1200 rpm. If -N279- is actuated at a higher engine speed, it may not open on completion of actuation as the coolant flow rate is then higher (and there is no flow of heated coolant into the heat exchanger of the air conditioning unit). |
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| Prerequisites for checking heat output and actuation of temperature flaps of air conditioner → Chapter |
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| Checking heat output and actuation of temperature flaps of air conditioner → Chapter. |
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