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Pelican Technical Article:

Replacing Your Thermostat

Steve Vernon

Time:

2 hours2 hrs

Tab:

$50 to $150

Talent:

**

Tools:

E10 Torx, large bucket, thermostat removal tool, 10mm socket, T25 Torx

Applicable Models:

Porsche 987 Cayman (2007-08)
Porsche 987 Cayman S (2006-08)

Parts Required:

Thermostat, gasket, coolant

Hot Tip:

Work on a cold engine

Performance Gain:

Engine runs at the proper temperature

The thermostat helps control the engines temperature. If your car is running too hot and there is the proper amount of coolant in the car and it is not leaking, or if your car is taking a long time to warm up, there is a very good chance your thermostat is bad and needs to be replaced.

The thermostat on the Cayman, like a lot of things on the vehicle, needs to be serviced from below. It is located on the right front of the motor. You will need to remove an under tray and also drain the coolant to replace it. If the coolant in the car is new there is no reason to replace it as long as you drain it into a clean container. Coolant is expensive and not too great for the environment so if the coolant in your car is good, try and save it to reuse.

While you can buy a thermostat and housing together, if you are only replacing the thermostat there is a special tool that you can purchase if you like. You can also make one from a piece of PVC pipe.

If you are going to be working on the thermostat, make sure the car is cool and not under pressure. Working on a hot engine or on one under pressure can cause serious harm and should never be attempted. Coolant is also very toxic and needs to be collected and disposed of in accordance with your local regulations. Pouring coolant down a drain or into the street is illegal. Also, be sure to wash your hands thoroughly after working around it.

Begin by safely jacking up and supporting your car. With the car safely off the ground you will need to remove the tray.

Begin by removing the under tray at the rear.
Figure 1

Begin by removing the under tray at the rear. Use a T25 Torx and a 10mm socket and remove the four T25 Torx screws (red arrows) and the two 10mm screws (yellow arrows) and lower the tray.

With the tray removed you can see the coolant hoses on the front of the motor.
Figure 2

With the tray removed you can see the coolant hoses on the front of the motor. You are going to need to drain and refill the coolant to replace the thermostat, so please see our article on coolant flush and fill for those procedures. While you do not need to remove the quick disconnect hose (blue arrow) it is simple to do and will help the system drain completely. You do need to remove the hoses for the thermostat (yellow arrow) and the heater core (red arrow) to get the coolant to drain to the level below the thermostat.

With the hoses off you can see the outlet for the thermostat (red arrow) and the heater core (yellow arrow).
Figure 3

With the hoses off you can see the outlet for the thermostat (red arrow) and the heater core (yellow arrow).

The thermostat housing uses E10 bolts and the top one can be difficult to access so make sure you use the right socket, you do NOT want to strip these bolts.
Figure 4

The thermostat housing uses E10 bolts and the top one can be difficult to access so make sure you use the right socket, you do NOT want to strip these bolts. These bolts are considered single use only by Porsche and they recommend you replace them each time you remove them.

Use your E10 and remove the four bolts holding the thermostat housing in place (red arrows).
Figure 5

Use your E10 and remove the four bolts holding the thermostat housing in place (red arrows).

Pull the thermostat and housing from the engine.
Figure 6

Pull the thermostat and housing from the engine.

Before installing the new gasket, thermostat and housing make sure to carefully clean the surface of any old gasket to give a clean flush mounting surface.
Figure 7

Before installing the new gasket, thermostat and housing make sure to carefully clean the surface of any old gasket to give a clean flush mounting surface.

Always install a new gasket every time you replace the thermostat.
Figure 8

Always install a new gasket every time you replace the thermostat.

The thermostat is held in the housing by the spring.
Figure 9

The thermostat is held in the housing by the spring. The thermostat sits in two recesses in the housing (red arrows).

To remove or install the thermostat you must compress the spring by pushing down on it and turn.
Figure 10

To remove or install the thermostat you must compress the spring by pushing down on it and turn. You can buy a special tool or get the right sized PVC pipe and cut out two notches; this will allow you to put it over the thermostat, compress the spring and turn the clip. Installation of the new thermostat is the reverse of removal.

You will now need to fill and bleed the system.
Figure 11

You will now need to fill and bleed the system. Please see our article on coolant flush and fill.

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Page last updated: Wed 5/24/2017 03:18:16 AM