Opel Astra H: replace thermostat

Data sheet
Vehicle modelAstra H
Engine1.7 CDTi
Engine codeZ17DTR / A17DTR
Model year2007 - 2010
Please noteThe coolant thermostat has been concealed below the intake manifold.

Important safety note Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.

Opel Astra H: replacing the thermostat including instructions and note

In the Opel Astra H, the coolant thermostat has been concealed below the intake manifold. 


Proceed as follows to remove it:

  • Disconnect the battery (potentially write down the radio code before you disconnect the battery)
  • Remove the battery and battery bracket (Fig. 1)
  • Remove the hose and lid from the thermostat housing


You can now see the thermostat (Fig. 2) and replace it. 


The coolant temperature sensor has been installed to the left of the thermostat. Pay particular attention to the short coolant hose behind it. In some cases, it has been damaged, thus causing a leak that is hard to find.


Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.