If the heater still blows cold when there doesn’t appear to be a problem with the water level or the thermostat, it could be due to a blockage of air in the cooling system. With the engine running, use a screwdriver to turn the bleed port anticlockwise to expel excess air. Should none of these measures help, it could be the heater itself that I own a 2010 Citroen C4 Picasso 1.6 VTR+ with a blower problem. Symptoms as follows…. *strange smell when engine turned on first (blower never works for a while once engine started) * intermitent working i.e. will work (mainly on full whack), I turn it off and on again and it’s dead. * strange noise on low power (when there settings work) Hello there hoping somebody could help have a real big problem with the front blower not working on my Grand Picasso C4 2013. I have confirmed the following - the motor blower still spins if I connect 12 volts directly to it - the drain holes under the front wheels are not blocked I have a Citroen Picasso Automatic 1.6 5 Seater 2008 Model 65,000 miles A couple weeks ago the heater stopped working. When the garage investigated the problem the found the heater and resistor burnt out, along with another wire or two! Re: C4 Picasso 2015 (B78 plate) Heating problems. by GiveMeABreak » Thu Jun 10, 2021 10:49 am. It is not an easy job and that is why they are charging this amount as half the dash may have to come off to get to the unit. A DIY repair often involves cutting out parts of the plastic housing to get to the spindles and then gluing everything back GiveMeABreak wrote: ↑ Wed Jan 12, 2022 6:21 pm @ Mick - Mick those are completely different systems to the C4 Picasso (B78). That 407 does not have the same mechanism at all It's a fascia off to get the heating unit out. Those control arms are on the diagram item (14) that I mentioned earlier. Water condenses on the outside of the cooling matrix (air con evaporator) and collects in the plastic surrounding box between the front footwells but should drain out to the outside of the car, unless the drain is blocked. 2. Does the windscreen steam up a bit. 3. camer wrote: ». If the fan is blowing cold air then the fuse is fine, the water flow valve to the heater matrix cold be frozen or seized or there cold be an airlock in the pipes that feed the matrix.Some cars have bleed valves on the matrix flow and retun pipes to allow the air to be removed, usually peugeot and citroen. b33nk8x.