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Customer states:
Workshop findings:
To comply with technical requirements, the engine must reach a specific temperature range within an extremely short time. To ensure this, the mechanical coolant pump is covered after a cold start, which means that coolant does not circulate in the coolant circuit. Once the required temperature is reached the cover is removed, and the coolant then circulates via the heat exchanger for the passenger compartment; this leads to a rise in the interior temperature. Under certain ambient conditions, however, coolant circulation in the “large” coolant circuit can lead to a drop in the component temperature of the engine and the reactivation of the cover for the mechanical coolant pump; this in turn results in a drop in the temperature of the outflowing air which heats the interior. This complaint should no longer occur after the warm-up phase (~15 min). Not applicable. This is normal. This TSB is informational only and not applicable to any Audi Warranty. All part and service references provided in this TSB (2077770) are subject to change and/or removal. Always check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair. ©2025 Audi of America, Inc.All rights reserved. The information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher. |
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