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Thermostat Replacement
 
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Pelican Technical Article:

Thermostat Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$10 to $60

Talent:

***

Tools:

Flathead screwdriver, 8mm wrench, vacuum bleeder

Applicable Models:

Volvo C30 T5 (2008-13)
Volvo C30 T5 R-Design (2008-13)

Parts Required:

Thermostat, coolant

Hot Tip:

Change your car's coolant at the same time

Complementary Modification:

Replace radiator hoses

The thermostat is used to restrict coolant flow in the engine until the coolant has reached a certain temperature. This helps the engine warm up sooner when it is cold. Over time, the thermostat can stick shut, resulting in an engine that overheats. Replacing the thermostat is relatively easy, although some items must be removed to access it.

Begin by disconnecting the negative lead on the battery. See our article on battery replacement for more information. This is merely a safety measure as the thermostat housing is directly above the starter. You will also need to drain the coolant from the engine. If you fail to do so, you'll spill coolant all over the starter and possibly damage it.

You'll also need to remove the air filter housing from the front of the engine. See our article on Air Filter Housing Removal for more information. Once the thermostat is replaced, you'll need to purge the system of air using a vacuum bleeder. See out article on Coolant Flush and Replacement for more information.

Begin by loosening the 10mm nut (green arrow) that holds the connector to the negative post on the battery.
Figure 1

Begin by loosening the 10mm nut (green arrow) that holds the connector to the negative post on the battery. We will be working around the starter and it is likely you'll spill a small amount of coolant on it. See our article on Battery Replacement for more information.

Jack up the front of your C30 and locate the radiator drain plug on the left hand side near the bottom (green arrow).
Figure 2

Jack up the front of your C30 and locate the radiator drain plug on the left hand side near the bottom (green arrow). Unscrew the drain plug and let the coolant completely drain from the radiator.

Now move to the rear of the oil pan and locate the oil cooler.
Figure 3

Now move to the rear of the oil pan and locate the oil cooler. Loosen the hose clamp (green arrow) on the coolant line and pull it off. This will drain all the coolant from the engine block. See our article on Coolant Flush and Replacement for more information.

Shown here is the thermostat housing which sits under the lower intake manifold and above the starter.
Figure 4

Shown here is the thermostat housing which sits under the lower intake manifold and above the starter. ThisPicture shows the housing with both the manifold and starter removed for clarity. Use a flathead screwdriver to loosen the hose clamp (green arrow) holding the radiator hose to the housing and pull it off. Be prepared for a little coolant to spill out.

Loosen and remove the three 8mm bolts (green arrows) holding the cover on the thermostat housing.
Figure 5

Loosen and remove the three 8mm bolts (green arrows) holding the cover on the thermostat housing. Note that in thisPicture, one of the bolts is not visible. Now pull the cover off the housing.

Below the cover is the thermostat itself.
Figure 6

Below the cover is the thermostat itself. Note the orientation of the vent valve (green arrow). This must face upwards when installing the new thermostat. Simply pull the old thermostat out and be prepared for some coolant to spill out from behind.

Make sure that the rubber seal fits around the edge of the new thermostat (green arrow).
Figure 7

Make sure that the rubber seal fits around the edge of the new thermostat (green arrow). The seal should come with the new thermostat. Place the new thermostat back in the housing, re-install the cover and tighten down the bolts until they stop.

The last step is to fill the engine with coolant and use a vacuum bleeder as shown here to purge all the air from the system.
Figure 8

The last step is to fill the engine with coolant and use a vacuum bleeder as shown here to purge all the air from the system. See our article on Coolant Flush and Replacement for more information.


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