ALH TDI Thermostat Replacement – IDParts Blog – Diesel News, Info and Guides

If your TDI is not reaching full engine temperature and the air coming out of the vents is not very hot even on the hottest setting, it may be time to replace your thermostat.  Luckily, replacing the thermostat on an ALH is a straightforward affair. Buy the Right Parts To make this job easy, you…

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IDParts has put together a complete service kit for a thermostat replacement on 1999-2003 Mk. IV TDIs. Often times, the thermostat housing breaks upon

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