106 Answers. SOURCE: 01 jeep grand cherokee heater works on driver side. You have 2 posibilities.there are 2 motors on the heater box that run the blend doors for each side.That side motor may be bad or worst case the blend door arm that connects to the motor is broken.If it is broken the whole dash has to be removed so the heater box can be 33. Posted February 24, 2007. C4VTS said: My heated drivers seat has stopped working. The dealer wants the car for 2 days to strip the leather seat down and locate the fault. The Citroen technician said it may be a broken element, and could mean a new seat covering if the element is built into it, but he is not sure, which is why it needs 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 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. car heater does not work, blowing cold air. why not blowing hot air? I will show in this video. I saw that when I try to change temperature on heater control Citroen Xsara Picasso - heater blower not working . Hi ive tried everything i can think off to see what the problem is with my car its a y reg 1.8 petrol ive ;changed the heater reistor checked the fan works by taken it out and useing a car battery to test it works and does .ive done all the fuses they fine and ive checked the ignition switch but now dont no what else to do please help  KSUQ.