Uploaded March 2016 | Updated September 2026, 2 weeks ago

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Simple DIY how to: changing the thermostat on a Ford Duratec HE engine. The car featured is a Ford Mondeo Mk3 (2000--2007) but the procedure is much the same for any car using the Duratec HE, e.g. the Focus Mk2.

See also this video on flushing and renewing the coolant: youtu.be/loB5tDd4jow

Update and redux video: youtu.be/HPuL2FOiZ58
Update #2 after leaking gasket: youtu.be/rWnsSOAkldA

You will need:
* New thermostat to suit, pay attention to which version you need: heated (with connector, Ford Mondeo part # 1358178), or dumb (connector-less Ford Mondeo part # 1476205)
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* Socket set, 1/4" or 3/8" components, ratchet handle and extension(s)
* Pliers or mole grips / vise-grips
* Flashlight
* Brake clean or solvent/cleaner and rags
* Premixed coolant (to Ford spec WSS-M97B44-D) and funnel to top up lost fluid, OR all materials to do a full drain and refill (see coolant change video)
* Helpful: hot air gun
* Helpful: small mirror.