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Thermostat Replacement
 
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Pelican Technical Article:

Thermostat Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$150

Talent:

****

Tools:

13mm socket, flathead screwdriver, T35 Torx

Applicable Models:

Volvo V70 (1998-01)
Volvo V70 2.4T (2001)
Volvo V70 AWD (1998-99)
Volvo V70 GLT (1998-00)
Volvo V70 GLT SE (2000)
Volvo V70 R (1998)
Volvo V70 R AWD (1999-00)
Volvo V70 T5 (1998-01)
Volvo V70 X/C (2001)
Volvo V70 X/C AWD (1998-00)
Volvo V70 X/C AWD SE (2000)

Parts Required:

Thermostat, hoses, engine coolant

Hot Tip:

Work with a cool engine

Performance Gain:

Car will cool down again or restore function of heater

Complementary Modification:

Change radiator hoses

Volvo V70 models utilize a mechanical engine thermostat. Other cooling system components consist of:

Radiator and coolant overflow tank.

Timing belt driven coolant pump bolted to the side of the engine block.

Electric cooling fan attached to engine side of radiator. The cooling fan is controlled by the engine control module (ECM) via an output final stage.

Automatic transmission cooler (heat exchanger).

Coolant temperature sensor at cylinder head.

Coolant hose and lines.

Thermostats sit in engine coolant, with a temperature reacting bulb and spring that blocks or allows coolant flow depending on engine temperature. The thermostat is used to raise engine operating temperature quickly and precisely to the optimal range and to maintain it there for maximum efficiency and minimum emissions.

Symptoms of a faulty thermostat are engine overheating, slow to warm up and lack of heat. If you have these symptoms, replace your thermostat and bleed your cooling system.

In this article I will describe how to replace the thermostat in your V70. Be sure to work with a cool engine and confirm the cooling system lacks pressure before opening the cooling system.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Drain the cooling system. See our tech article on cooling system draining and filling.

When replacing the thermostat (red arrow), I suggest replacing the coolant hoses as well.
Figure 1

When replacing the thermostat (red arrow), I suggest replacing the coolant hoses as well. I have found many V70s with a fault code P0115, coolant temp sensor circuit fault code caused by a faulty thermostat. What I find it the thermostat brackets (green arrows) are typically broken, causing continuous coolant bypass of thermostat.

First you are going to have to remove the engine cover on the cylinder head.
Figure 2

First you are going to have to remove the engine cover on the cylinder head. Start by removing the two T30 Torx bolts (red arrows). Once these bolts are removed, there are two clips you have to detach.

Once the Torx fasteners have been removed, unclip the timing belt cover retainers.
Figure 3

Once the Torx fasteners have been removed, unclip the timing belt cover retainers. Pull them away from the cover while lifting the cover up.

Once unclipped, lift the timing belt cover up and remove it from the engine.
Figure 4

Once unclipped, lift the timing belt cover up and remove it from the engine.

Working at the radiator hose, use a flathead screwdriver to loosen the hose clamp (red arrow).
Figure 5

Working at the radiator hose, use a flathead screwdriver to loosen the hose clamp (red arrow). Next, remove the coolant hoses from the thermostat housing (inset).

Using a T35 Torx bit, remove the two thermostat housing fasteners (red arrows).
Figure 6

Using a T35 Torx bit, remove the two thermostat housing fasteners (red arrows).

Remove the thermostat and thermostat housing from the engine.
Figure 7

Remove the thermostat and thermostat housing from the engine. Be prepared to catch dripping coolant in a drain pan. Using a plastic scraper and a Scotch-Brite pad, clean the thermostat sealing surface. It is important not to use a metal scraper or razor blade here. You could damage the sealing surface and the thermostat seal will not seat properly, resulting in a leak. Install the new thermostat and evenly tighten all the fasteners. Install the cooling hose and fill and bleed the cooling system. Remember to check the cooling system for leaks and top up the coolant when complete.


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