How to change the starter motor 2009 citroen berlingo 1.6 hdi

The fuses are located behind the dash on driver side , u have to remove a little cover turning the screws half turn, the fuse is the F7 10 A or 20 A follow this video can find ........
Citroen berlingo fuse box relay location

Sound like it's starter motor at fault. With you saying it's after a long run there will be a lot of heat in the engine/gearbox this could be causing the starter to stick, like you say after half hour or more it's OK and short journeys you have no problem.

http://www.citroendriveeurope.co.nz/wp-content/uploads/2013/10/Citroen-Berlingo-Owners-Handbook.pdf

well since the starter was only 2 months old i am betting its an ignition short. When u turn the key, the solenoid on the starter engages the bendix gear with the engines flywheel and then energizes the starter motor. And when u release the ignition the solenoid and the starter motor should de-energize. hope this helps you.

Sounds like the starter motor
1 Check the electrical cable to the starter has not come loose
2 hit the starter gently so as not to damage it with a hammer where it goes into the gearbox as it may be jammed.
3. Get a motoring organisation or an auto electrician to check the wiring.
4 last resort replace the starter.

Starter is mounted on passenger side of the bell-housing. Remove 1 end of support bar bolted on bottom side of frame and swing it out of the way. Remove the starter's 2 mounting bolts. Reposition solonoid posts to face you. Remove these cables.------------------------------------------------------------------------------------
Car cable & OBD Connector

check electronic spark unit ie coil pack going open circuit when hot
will run but when turned off will stay open circuit untill cools down then closed circuit then will wprk fine

If you check your engine fuse box and find that your 20amp fuse is blown its either a sticking starter relay or water getting in your electrics. Try checking this first as the fuse box is directly above wheel arch and can get damp. Clean up green contacts and keep a spare 20amp fuse handy. After changing this blown fuse you will need to reset the engine management system by disengaging the battery terminal. You're clocks might be out but car will now start. Don't forget to buy that starter relay if problem persists.

please state year and model of this engine as they do change ,i think its a citreon something like a berlingo or maybe a 306 or whatever but need the year as the common rail is different to the injector pump model or is it a dreaded my favourite motor and thats a renault