Replacing the thermostat

On the 1.4i 75 hp engine, no disassembly is required to access the thermostat. It is on the front of the engine, accessible to the right of the engine block.

First, start by removing the metal tie that tightens the hose with a pair of multi-grip pliers. Squeeze the 2 ends and with a bit of luck, it will lock immediately in the open position. Be careful not to lose the metal tie.

Place a basin under the thermostat to collect the coolant that will flow out. Once the hose is removed by pulling on it, the liquid will flow out. Open the cap of the liquid reservoir so that it flows out better.

Using a 10mm socket wrench, or better, an articulated ratchet with a 10mm socket, remove the two studs that secure the thermostat to the engine block.

Please note that the thermostat of this model is connected to the engine control unit by an electric cable. Carefully remove the thermostat and disconnect the yellow plug.

Once the thermostat is removed, compare it with the new part. Here the thermostat was stuck in the open position and the engine was not heating enough. By blowing into the hose location, air was passing through all the time.

Place the new thermostat, carefully screw the 2 studs by hand to ensure that the threads bite correctly. Then lock with the socket wrench.

Reconnect the internal resistance plug.

Finally, replace the hose, paying careful attention to the position of the metal link. Unblock it with the pliers.

Fill the cooling circuit with new fluid.

The hardest part is yet to come. You have to open the bleeder on the passenger compartment heater radiator. The bleeder (which looks like a car valve cap) is hidden behind the engine air supply line.

With fairy fingers but an ogre's grip, gently loosen the tip.

Be careful not to lose it by dropping it on the ground.

Let the air out of the heating circuit. Once the flow has stabilized, gently tighten the tip with your fingertips.

Top up the coolant in the expansion tank.

Run the engine to ensure complete bleeding of the circuit. Be sure that the thermostat has opened (the radiator hose will heat up, the fan will start and then stop).