Vauxhall Astra H: replace thermostat

Data sheet
Manufacturer	Vauxhall
Vehicle model	Astra H
Engine	1.7 CDTi
Engine code	Z17DTR / A17DTR
Model year	2007 - 2010
Please note	The coolant thermostat has been concealed below the intake manifold.

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.

Vauxhall Astra H: replacing the thermostat including instructions and note

In theVauxhallAstra 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.

Opel-Astra-H-Kuehlmittel-Thermostat-Bild-1 — Figure 1: Removing the battery and battery bracket

Opel-Astra-H-Kuehlmittel-Thermostat-Bild-2 — Figure 2: Thermostat visible and ready to be replaced

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