Just below the radio is the ventilation display/panel. The bottom button on the right side next to the temperature button is the air con button. Once you press it you will see a snow icon on the screen. You can also press Auto button on the left side to activate the air conditioner.
To reset the service indicator Citroen C3, push the button on the instrument panel. Hold it for 10 seconds while turning on the ignition.
The diesel engine Citroen C3 have the fuel filter located in the engine bay, under the air intake pipe to the air filter. There are some pictures on this forum post: http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html and some instructions to remove the diesel filter here: http://citroenc3owners.com/diesel-citroen-c3/changing-the-diesel-fuel-filter-t102.html The petrol engine Citroen C3 has a filter in the fuel tank that lasts the life of the car.
Its under the turbo air inlet pipe in the engine bay. there are some photos of the Citroen C3 HDi fuel filter in the forum link http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html http://citroenc3owners.com/resources/citroen-c3-hdi-air-inlet-pipe-lower-mounting-point-inlet-pi/54
Its in an air box, at the back of the engine. (Between the engine and the firewall) There are some pictures here http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html The 8 valve version needs the 3 screws to be removed from the lid to access the air filter. The instructions for the 16v are more complicated and are here http://citroenc3owners.com/diesel-c3-tips/how-to-change-the-air-filter-on-a-citroen-c3-1-4-16v-hdi-t80.html
OAT Coolant.Mix the concentration dependant on your country (lowest temperature).seehttp://citroenc3owners.com/citroen-c3-tips/citroen-c3-coolant-t40.html
There are many features of the Citroen C3 Picasso. Examples of some features of the Citroen C3 Picasso includes an anti-lock breaking system and remote central locking.
Red OAT antifreeze and coolant. Premixed will be easiest. See the link for more information: http://citroenc3owners.com/citroen-c3-tips/citroen-c3-coolant-t40.html
NO....
The diagnostic plug is in the glove compartment in C3
Yes, in the C3 Picasso at least.
NO
where is the gear box on a citreon c3 1.4 hdi